Exciting times! So far I’ve cast bronze in Brandenburg for the Kunst- und Handwerkstechniken der Bronzezeit (Art and Craftwork of the Bronze Age) at the Landesmuseum in Brandenburg. Then I was in Moscow for the Times and Epochs Festival, where I cast even more bronze. Is that enough? No… In a week I’ll be going to Cyprus, the land of copper, to do even more bronze casting at the Vounous Symposium. This is a great honour since Cyprus was the source for Aegean copper. I will be seeing and working in one of the earliest areas where the craft of bronze working began.
I’ll be posting as often as I can and there will be lots of photos and pages written about the events. Up to date reports will be posted to my Patreon page.
I was invited to cast bronze at an event in Germany, but the catch was that I needed to dress in period costume. The skirt and tunic were easy enough, but I knew that the people there would look at my Iron Age shoes and comment on how anachronistic they were. I know, because it’s happened in the past. There are few Bronze Age shoes that have been preserved, and the most famous were the ones worn by Otzi, the Ice Man whose body was recovered in the Alps in 1991. There are a few websites describing how to make them, including one with a video,
Following the instructions onthis website,I cut out a pair of soles from the same leather I used for the Iron Age shoes, and punched holes around the perimeter. I didn’t have leather lacing, so I stitched them with multiple strands of sinew. Then I got some jute cord. This is made from the inner bark of the lime, or basswood tree (tillia sp). It is essentially the same as the cord used for Otzi’s shoes. I cut several lengths and started plaiting and knotting.
Lacing the Bronze Age shoe sole
I quickly realised that it wasn’t going well. I couldn’t tie the knots while wearing the shoes, so I made a sort of shoe last out of socks. I just wasn’t enjoying the project and it was looking a mess. I just wasn’t getting the measurements right and the shoe was too large.
Putting the cords on the Otzi style shoe.
I just wasn’t producing what I wanted, so it went on the back burner. When it was about a month out from the event, I nagged myself into getting the shoes done. The problem was that I wasn’t happy with how they were turning out. It would be easier if I was making them for someone else, where I could tie the knots while they wore the shoes. It was then that I convinced myself that I didn’t need to slavishly copy this particular shoe. The materials were proper for period, I just needed to find a way to make them so I was happy while using a technique that would be consistent with the Bronze Age. I decided to make a netted upper rather than one that was plaited and knotted. I started over, this time using a single length of cord. I measured off a length that was 5 times the circumference of the sole (note, this finished about half the shoe. On the second one I measured 9 times the circumference and that worked out perfectly).
I wove the cord in and out of the sinew, skipping every other stitch and leaving a small loop at the top near the edge of the sole.
Weaving the cord through the sinew to make the upper part of the shoe
Then continuing around, I brought a loop through the loop next to the sole and then threaded the cord through that to make a knot. It was easily adjustable.
Bringing the cord through the loop
The loop in loop
Pulling the cord through the upper loop
Pulling the cord through the upper loop, another vieww
Pulling the knot tight
I made the first round fairly tight so that it would pull the sole up around my foot. I did the same for the second round.
Fitting the shoe to my foot. At this point the netting is fairly tight.
On the third round I made the loops larger because I wanted a netted effect. If I wanted, could continue making the loops smaller that would result in a denser fabric. At this point it was easy to work on the shoe while wearing it.
Making the loops larger to make a more open netting.
After a couple more rounds I started making the loops even larger. I brought the cord around the front of my ankle, looping the cord between it and the loops closer to my toes.
The netting continues with wider loops
The netting is finished and fits around the front of my ankle.
By this time I was essentially done. It took me about three hours for both shoes, working at a relaxed pace. I had a fair amount of cord left over, so I wound that around the top cord of the shoe to reinforce the opening and to give it a bit more of a finished look.
The finished shoes
I made this pair fairly tight because I figure that both the leather and cord will stretch over time. Still, they are easy to slip on and off, and are comfortable for walking. I could make some leather uppers to go over the netting. Otzi’s shoes had that, although there is debate as to whether the leather was on top of, or under the cording. A project for the future is to learn nålebinding to make some socks.
Ever since he was recovered, I have had a fascination with Ötzi. His death and preservation gave us a unique opportunity to look into the face of someone who lived in the Bronze Age. We are able to examine his clothes and tools and use them to not only reconstruct the last days of his life, but also the lives of others in the Bronze Age.
A new article was published by The New York Times based on newly published research. The article titled, “The Final Hours of the Iceman’s Tools: What the implements found with the body of Ötzi revealed about the Copper Age” by Nicholas St. Fleur gives a fair assessment of the recent research. You can find the NYT article here.
Even better, Mr St. Fluer provides a direct link to the original publication published online through PLOS One, an open access platform, meaning that everyone read the article. “The Iceman’s lithic toolkit: Raw material, technology, typology and use” by Ursula Wierer, Simona Arrighi, Stefano Bertola,Günther Kaufmann, Benno Baumgarten, Annaluisa Pedrotti, Patrizia Pernter, Jacques Pelegrin is available here.
The NYT article gives details about how Ötzi appeared to be in a hurry in his last days. We knew already that his bow was not finished, but the PLOS One article goes into details about the state of his stone tools, the arrowheads, knife, and knapping supplies. The wear analyses showed how recently the tools had been retouched. The fine attention to detail in the examinations indicated how the fine scratches on the stone tools made by the lime bark holder would tell how recently the retouching had been done. Some tools also had evidence of of a particular type of gloss that occurs after the tool was used for cutting live plants.
The examination tells us brief stories about the history of the tools. The scraper was made from what was originally a knife and one arrowhead might have been made from stone reused from a sickle. We also know Ötzi was fairly well skilled as a flint knapper, since the evidence from his retouching tool (antler) and the recent retouching of some of the arrowheads would have most likely been done by him.
The end of the article by Ursula Wierer et al is exciting reading. Through the detailed examination of the condition of Ötzi’s tools, their origins, and how they were manufactured, they have reconstructed an almost moment by moment story of his last days.
Last year the Bronze Casting Festival was a wonderful experience. People from all over Europe came and exchanged information about bronze casting and metalworking techniques.
Here are a few photos of the First Bronze Casting Festival in 2017.
My talk on air flow and furnace design
Casting with Heide Nodegaard
Casting with Mark Vyvyan-Penny
Pumping Viking bellows. It’s a bit more work than Roman ones, or even bag bellows.
Pouring into stone moulds.
Stirring the bronze to make bronzing powder.
My furnace and bellows
A small Roman furnace designed for jewellery casting.
Bronze Age Bunsen burner
Chris Stein carving stone moulds.
I’ll be returning there again this May and furthering my experiments in metal finishing. In addition to casting, I’m interested in using metal oxides as colorants for enamels and how they are affected by the reduced environment of a charcoal furnace. In the past I did a lot of metal enamelling in an electric furnace. This will be a chance to explore how the process of enamelling could have been developed. I might even have a chance to make some glass while I’m at it!
Another female Bronze Age icon is now known to have travelled across Europe
Egtved Girl’s grave, from 1370 BC [Credit: The National Museum of Denmark]
Last year (2017) this story about the Skrydstrup Woman made the news. Strontium isotope analyses showed that she was not born in the same region where she was buried. Rather than coming from what is now Denmark, she started out life farther south in Bohemia. She was an honoured member of the community, buried in an oak coffin, wearing gold jewellery, and embroidered robes. Her hair was put up in an elaborate style, that would have required assistance. All of those items buried with her would have meant the sacrifice of objects that would have taken many days or even weeks of labour to manufacture. Analyses of her bones indicated she lived a healthy life and died from unknown causes when she was in her late teens. She arrived at Skrydstrup when she was about 14 or 16 years old.
New analyses was presented at the 14th Nordic Bronze Age Symposium in Oslo, Norway in June of 2017. The work of the Tales of Bronze Age Women Project (National Museum of Denmark) employed strontium isotope and other analyses to determine the mobility patterns of women in Bronze Age Europe. The early results have determined that the Skrydstrup Woman travelled extensively and that the Egtved Girl did not make one trip from the Black Forest region of Germany where she was born, but made several trips between there and Denmark. The project continues to explore how mobility patterns of prominent women could be a part of social and economic exchange and networking in the Bronze Age.
I can relate to these women. By the time I was the age of these young women, I had travelled from where I was born in southern California to San Francisco, from there to the Upper Peninsula of Michigan to Milwaukee and Chicago, over a thousand miles from where I was born. As an adult I’ve lived in both North America and Europe. It used to be assumed that people in prehistory lived their lives in a single community, and if someone travelled long distances, it was assumed to be men. However, then as now, we see that people were mobile. This mobility not only brought an individual woman into a community, but also her way of life. She would have spoken at least one other language, a useful skill if her family were merchants. She might have brought other valued resources to her community, such as a new way of making pottery, new weaving patterns, or other skilled crafts. The objects from her home would have been seen as exotic, foreign, or rare.
The history of archaeology has been full of explanations for the movement of people. At times they were described as political conquests or invasions, the Beaker Folk, Anglo Saxons, Vikings… each generation of archaeologists give a new and different interpretation of the data we have. Were they marauding warriors replacing the local population, groups fleeing strife in their homeland, or peaceful settlers arriving with families? Or some of each? The evidence we have of social change in prehistory comes from changes in material culture: a new style of pottery, the introduction of a new technology, or changes in the way the deceased are dealt with. In some cases these cultural changes can be dated and tracked, allowing us to look at the progression of something, such as a craft techniques, from its origins and disbursement. However in tracking all the data on all these objects the humans sometimes get left behind. The bowls, beakers, and axes didn’t move themselves. People were travelling, carrying them, moving from one place to another. It makes sense, humans have been on the move since the beginning. From small bands in Africa, humans have spread out over the entire planet. We continue to move and migrate as groups and individuals to this day, bringing skills, languages, and ideas with us. Creativity, adaptability, and mobility are human strengths.
The Skrydstrup Woman puts a personal face on migration. We cannot tell the circumstances that led these women to travel across Europe to Denmark. What remains is that they travelled long distances in their lives, and not just going directly from where they were born to Denmark. Although they have been an icon of Danish prehistory for years, both the Skrydstrup Woman and the Egtved Girl were immigrants. Their story has expanded now, and rather than a symbol of a single national identity, they represent the multicultural world of human prehistory.
The video below was produced by the Tales of Bronze Age Women project. It shows the processes used in the analyses of the women and some of the early discoveries of the project.
New article available through EXARC. See the link below for the full article
It is accepted knowledge that when re-melting alloys, some of the metal with a lower melting temperature is lost through oxidation, and more metal must be added in order to maintain the desired alloy proportions. In order to understand the changes in alloy content when recycling using Bronze Age technology, experiments were undertaken by the author and others, using a charcoal furnace. These experiments included recycling bronze to quantify the loss of tin, and how alloys were affected by co-melting metals. The results were then compared to modern metallurgical practices using electric and gas furnaces. The initial results were presented at the Historical Metallurgy Society’s Research in Progress Conference in November of 2009. However, this paper includes further experiments that build on the earlier work. The conclusions indicate that knowledge of earlier practices was lost with the advance of technology, and that broad assumptions cannot be made about earlier technological practice based on work done with modern equipment.
On November 1-3, 2017 I was in Macomb, Illinois leading a bronze casting workshop at Western Illinois University. This was the first event of its kind for the University and few people there knew what to expect. While the archaeology program provides for a certain amount of flintknapping and some pottery done by students, there was no available program for the introduction of the method and theory behind experimental archaeology.
Professor Andrea Alveshere, a colleague of mine from the University of Minnesota and I discussed the possibility of my coming to give a short seminar and workshop. There wasn’t much in the way of funds for the project, so I agreed to come as long as my expenses and materials were covered. It was a program that both she and I very much wanted to introduce to the university.
I had a long train ride from St Paul to central Illinois, but enjoyed seeing the landscape. I arrived fairly late that evening and was taken to cabins on rural property now owned by the university. The land and cabins had been bequeathed to the university and they are a great resource. In addition to dorm-like cabins with bunk beds, bathrooms, and limited kitchen facilities, there is a dining hall with a complete kitchen. We made sure that there were supplies for coffee and breakfast and checked out the site where we would build the furnace.
The grounds around the cabin are level and grassy, and there was already a large firepit with picnic benches arranged around it. I met the site manager, and we chose a spot beyond the firepit where we could construct a small pit furnace. She was excited about the project and had no problems with holes being dug. She also liked the idea of the furnace being buried when we were done with it so that it could be excavated later.
We hit the ground running on Thursday. Andrea picked me up and we went to the university where I met students and staff in the art metals department. They were excited about participating in the project and were glad to provide us with supplies. The idea of primitive casting was fascinating to them and they looked forward to the event. I borrowed some tongs and other equipment from them, with more to be delivered the next day. While we spoke, one of the professors who teaches pottery came in. We needed clay, and I had to explain that we wanted his worst stuff, the stuff that’s scraped off tables that’s usually discarded or sent for recycling. He didn’t quite understand why we wanted the useless clay, but he said that we could have as much as we wanted.
After lunch we made a run into town for more supplies. We found bags of sand and proper lumpwood/natural charcoal at the local farm store for a reasonable price. The plan was to cast into cuttlefish bone since two days was not enough time to make moulds for lost wax casting. Andrea had ordered cuttlefish bone from a wholesaler, but unfortunately when the shipment of arrived it contained packages of aquarium gravel. So we were also scouring local pet stores for cuttlefish. Andrea contacted the company she ordered from and arranged an overnight delivery, but there were no promises that it would arrive in Macomb in time. The nearest FedEx office was in Peoria and it would have to go by post from there to Macomb.
We agreed to meet up at the site at 2:30 to build the furnace. When we arrived, a few students were already on site. I explained to them about clay mixing and the reasons we mix sand and dung with the clay. In the process they got a basic lesson about ceramic petrography, and early clay recipes.
Note the supports for the teapot stand inside. It was a well made and durable furnace.
By the time we were done they had a working knowledge of clay bodies and the physical experience of working with it as well. A hole was dug and then it was lined with clay. I explained about tuyeres and used a branch to construct a clay-lined hole that ran from the top edge to the base of the furnace. When I build a furnace I usually ask the students to decorate it in some way. Usually something is put above the hole where the tuyere comes in. While working, the students decided that the furnace should have a turtle head above the tuyere. A nice choice, since the glowing charcoal would make for an interesting turtle shell! While they worked on that, I made the platform (also known as teapot stands or perforated clay slabs) to place in the furnace. By 6:30 pm we had everything done. That was right on time since I needed to change clothes for my talks at 7 pm at the university.
Once I was cleaned up Andrea took me to the lecture hall. It was a great facility with a large wall-sized screen and auditorium seating. It was almost half full, which was good considering that it was a weekday evening and the subject was unfamiliar to most people. Despite that we drew attendance from the anthropology and art departments, in addition to members of the local archaeology society and members of the public who were not associated with the university.
I gave three short talks in succession with questions and answers after each one. These were all presentations that I’d previously given at conferences, all of which were about 15 minutes long. I started off with the one I gave in Oslo about the significance of mistakes and how they are preserved in metalwork. The second was about Minimum Tools Required, a portion of my PhD thesis that organised the chaîne opératoire of metalworking. The final talk was about excavating metal, based on the BAJR guide that I’d written. The questions were enthusiastic and despite there being little in the way of prehistoric metal in the region, there was interest in the subject. I did answer a couple questions about Lake Superior copper use among Native Americans. There is some debate as to how some of the copper objects arrived in central Illinois from northern Minnesota. Were finished objects traded by Native Americans, was the raw material transported and traded, or was the copper a chance find of raw material that had been redeposited in southern Illinois by glacial action? I hadn’t seen the objects, but typology might provide a part of the answer. At the end I spoke a little about what we would be doing the next day.
Afterwards Andrea and I returned to the furnace. Although it was still damp, I wanted to get it dry before casting the next day. We laid a little fire and sat talking late into the night. The presentation had been a great success and it looks as if it generated a lot of interest.
Friday I was scheduled to give a talk on experimental archaeology at noon. This was basically an introductory lecture about why and how experimental archaeology is done, along with the basic ground rules for doing experimental work. Word had gotten out and the room was filled to capacity. After the talk we headed back to the site and got to work. Because we hurried the process along last night there were a couple cracks in the furnace, but because it was set into the ground the cracks had little effect. The furnace was still warm from the previous night and I used a trusty pig scapula to scrape out the ash and leftover charcoal and then fit the platform in place. The fire was lit and after I had worked the bag bellows for a bit, the students took over. Every group I work with seems to have a different approach as to how to operate the bellows. I know that the way I do it, alternating pumps with one per hand, is difficult to coordinate for many people trying it the first time. Some people never quite get it and just pump both the bellows at the same time (affectionately known as the Cambridge Method). Here, the students teamed up and had one person per side, operating the bellows with both hands. They were surprisingly well-coordinated. The students were energetic and worked long sessions without tiring. At times I had to ask someone to give up their place to let another student try. I wanted to make sure that everyone who wanted to (including non-students who had come to see what was going on) had a chance at the bellows. The furnace took a bit longer to get the first crucible of metal melted than it normally does because of the frequent changes of personnel pumping the bellows, but we did get there. About an hour after we started Andrea got the call that the cuttlebone had arrived. Students were already carving moulds from what we had on hand. Now things were in full swing. I was grateful to the jewellery professor who took on showing the students how to prepare and carve the cuttlebone while I supervised the melts.
I hadn’t noticed that I was still wearing my coral earrings from the lecture!
Opening the mould of another successful cast
A freshly cast bronze knife
There were a few failures due to improper mould preparation. It gave me the opportunity to explain how easy it was to lose droplets of metal while casting and pointed out the debris that was getting trampled around the furnace, tell-tale clues that an archaeologist needs to look out for in a site that could be mistaken for a cooking pit. Every experience that day was a teaching moment. Both instructional and non-discursive. Repeatedly students told me that they had never known that there was such a thing as experimental archaeology, and that they were thinking about archaeology in a new way. A couple students who had not yet declared were suddenly thinking about the possibilities of having a major in anthropology.
The students wanted to keep going despite a large pot-luck dinner that had been prepared, so we all went to eat in shifts. When I took a break, people assured me that I wasn’t too soot covered, although I felt as if I had charcoal smoke in every pore. The head of the Anthropology Department came up and complemented me on my lecture. He was impressed by how I presented the information and noted the enthusiasm of the students. The potluck was also attended by members of the local archaeology society who aren’t formally a part of the university, but attend functions and often work with students on projects. We had a great time talking about local archaeology and experimental work.
After dinner we worked a little more, but it was long past the time that we could see well in the dark. We packed up as much as we could find and put it all in the cabin.
Blowing off the bits of charcoal before pouring. Always exciting!
I had the choice of leaving on Saturday or Sunday. I opted for Sunday because the train left at 7 am and I knew that Friday would be a late night. I told the students that if they were interested, we could continue casting on Saturday. I had no lectures or other plans, so we agreed on a 10 am start.
The next morning we had another good-sized group of students. The previous day there had been close to a couple dozen people in the afternoon and rarely fewer than a dozen visiting throughout the day and evening. Saturday was more relaxed, but still well-attended. Students made moulds and instructed new participants who hadn’t been there the day before. The more experienced ones were already taking on tasks like they were old hands at it.
Andrea was amused that this was supposed to be my day off, but instead it was another full day of casting. Some experimentation was done with hammering (using my bronze hammer and anvil) and other finishing work. One student was keen on textile archaeology, so she cast some beautiful spindle whorls. I also made some clay ones with her, using some of the scraps left over from building the furnace. Once dry, she’ll take them to the art department to see if she can get them fired there. I heard that they also do raku pit firing.
Clay, pewter, and bronze spindle whorls. experimental Bronze Age metallurgy meets textile archaeology!
Towards evening I needed to call it quits. I had an early start in the morning and needed to get things cleaned up and packed. The students reluctantly poured the last moulds and we got everything in order. The next day they would cover the turtle furnace with dirt and let it deteriorate. Left to itself, it should be covered in grass in a year. In a year or two it will be just as useful as a teaching tool for excavation.
The entire event was successful and exceeded our expectations. We had brought an entire new perspective on archaeology to the department, and the department heads were impressed. In my talk I had emphasised the value of programs like this not only for hands-on student learning, but also as a unique opportunity for public interaction with the department. Too often universities are segregated from the surrounding community leading to the local residents wondering what goes on there. Experimental archaeology programs, especially those performed out of doors, provide an opportunity for interaction and public participation, and even drawing on experience of people from outside the university. Andrea and I discussed the possibility of doing a longer workshop or even the possibility of an accredited short course. Now that the department has been given an idea of what can be accomplished, they might be more amenable to funding it.
These are ambitious ideas in a time when universities are hurting for money. I was glad to be a part of this mainly because I wanted to help Andrea introduce experimental archaeology to her students and colleagues. There was no budget for such an unknown project, but because we were keen on this, Andrea scraped what funds she could get at short notice and we put it together on a shoestring. I would love to pursue this and give students the full range of what an experimental archaeology course could offer, but that is for the university board to decide.
In the meantime, I would like to thank all the people who support my project on Patreon. They provided the opportunity for this seed to get planted and for students to have a unique experience that will benefit them in their careers as archaeologists. The contributions made through Patreon and PayPal go towards giving more people the opportunity to explore the world of material culture in a way they never realised before. If you’re interested in finding out more about my Patreon project or making a sustaining contribution please click on the link below.
The furnace at night
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It was my pleasure to present a paper at the Nordic Bronze Age Symposium in Oslo . The conference focused on contrasts and connections in the Bronze Age. Presenters covered a wide range of topics from landscape, technology, social practices and materialities.
The session that I participated in was titled Nobody is Perfect: Contrasts in Craft. I spoke about recognising the learning process by examining mistakes in metalwork. It was a great session and I hope that the research presented here will spur others to examine the flaws in objects to understand the processes of craft production.
Too often artefacts are selected for examination and display because of their perfection, but perfection can limit us. We see the end product but by the very process of achieving perfection the traces of the journey to mastery are erased. When we examine flaws, both minor and major, the world opens up.We can follow the movements of the artisan’s hands and see the sequence in which an object was made. We can see the choices made during production. Was there a flawed section of decoration because a master artisan was momentarily distracted, or was it because an apprentice was still awkward using tools? We can also question why the flaws remain; why the object survives, rather than having been destroyed or repaired.
The flaws, repairs, and mistakes all contribute to the object’s biography and allow us a glimpse of craft and decoration in ancient cultures. The papers presented in this session examined these and more subjects on mistakes in craft, and generated lively discussion.
“Nobody is perfect: contrasts in craft – for the first time at an archaeological conference artists, craftspeople and archaeologists gathered together to discuss the potential of mistakes, failures and repair within material culture of the past. The results were stunning: mistakes, failures and repair can not only help to identify skill level and apprenticeship in craft, they also indicate the intention, the actual purpose of an artefact.” – Heide W. Nørgaard
In March 2017 I had a great time talking to the students at Cyprus Classical Academy about what archaeologists do. Cyprus Academy is a Montessori school in which classes are organised by ability rather than age. The students I spoke to ranged in ages from 6 to 11. This is a great age for kids to learn about prehistory and the fascinating story of how people invented tools and developed crafts. The students had a chance to look at and handle artefacts, pump a set of bag bellows, and have a go at using a drop spindle to spin some wool. They will continue on studying prehistory and history, but I doubt they’ll ever think about ‘cave men’ the same way again. Apparently one of the teachers was amazed by finding out that Neanderthals made flutes and had music.
One of the unexpected benefits of my talk was that a girl in the class was excited to know that there are women archaeologists. There is the popular perception that archaeologists are men, and while field archaeology tends to have more men excavating, I pointed out that women also excavate, and also work in labs and museums. I included some slides showing kids volunteering cleaning finds, to let them know that there’s a place for them in archaeology too.
I was visiting my sister in the autumn of 2016. She has a bit of landjust outside Albuquerque, New Mexico, so I asked her if I could build a furnace and do some casting there. I’ve built plenty of pit furnaces, so this time I wanted to build one that was above ground and a bit more visible. It would also mean that no one would trip and fall if they forgot where I put the thing.
The first task was to get the basic materials: Clay, Sand, and Horse Manure.
I thought that the clay would be the biggest hurdle. However my sister’s neighbour happened to be a sculptor who works in both iron and ceramics. She went to her regular clay supplier and got a couple feed sacks full of dried clay for free. Potters who work at wheels, or work with students end up with a lot of clay that is scraped off of workbenches and wheels that is hard to re-use. It often has a mixed consistency, it’s lumpy or part dried. If they want to use the clay again, it has to be reconditioned. So, they take their sacks of scrap back to the place where they buy the clay and pay to have it put through the mill. Since it’s not really usable, some potters are willing to just give it away. So thanks to Liz Fritzsche, who does amazing and beautiful work in porcelain, I was able to get started.
Mixing dried clay. Once it’s wetted, I’ll add sand and manure
I threw some of the dried clay into a five gallon bucket and poured in enough water to cover the clay and let it sit. It was squishy and workable in a few hours. Next up was locating horse manure. A friend of a friend has horses, and they were grateful to have someone who would haul away a couple of barn buckets full of manure. The final bit was the sand. My sister did have some beach sand that she’d bought for the garden, but I was more fascinated by the soil there. Her land is in the old Rio Grande River Valley, and the soil is a mixture of silty sand and a little clay that had been pounded to a powder. The soil was almost the consistency of dust. It mixed in perfectly and later I found the mixture was highly resistant to cracking.
The ingredients were mixed with some water, stomped, and the proportions were adjusted until it was perfect. New Mexico is a lot drier than England, so I ended up adding more water than usual as I worked. It was also nice knowing that it was unlikely for any rain to fall while I was working.
The silt/clay/dung mixture made a durable clay, and after I flew back to Minneapolis, I was please that the crucibles and moulds I packed in my check-in luggage survived airport handling.
Note the small tabs inside that will support the teapot stand
The furnace walls are about 8 cm wide (about the width of my palm) and the inside diameter is about 25 cm in diameter. I let it dry for a couple days and then moved it over to an unused area behind a greenhouse where I would have more room to work. I set a small fire with cottonwood branches, fed it for a couple hours, and then let it die out overnight.
The thickness and upper dimensions of the furnace
The height of the furnace
Mavis the dog immortalised in a furnace!Mavis in a calm moment. Her nickname is the Dog-nado.
We all like to put some decoration on our furnaces. My students have done everything from dragons to turtles to cats. I had been thinking about doing some decorations imitating the local petroglyphs, but as I was working it just seemed natural to do a portrait of Mavis, my sister’s exuberant German Shepherd.
Finally I adjusted the mix to have a bit more of the silty sand and horse dung to make the teapot stand and crucibles. For more information about teapot stands and how they work in furnaces, check out my article on the Umha Aois website here.
Later I added more water to make the slip for dipping waxes in for the first stages of mould making. The silt made a wonderfully fine mould that picked up all the details. Honestly, this mix was as good as jeweller’s investment for picking up detail.
I had some cracking on the upper part of the furnace, and noted that the part that cracked was where I used the commercial sand. The silty New Mexico soil held up much better. If it weren’t so heavy (and probably not allowed) I would have hauled bags of the soil on the plane home to use for more projects.
Detail of cracking on furnace. It was fixed by rubbing in some of the clay mix.
Both Mavises performed very well (Mavis the Dog is into barrel racing and advanced obedience classes). I’ll be interested to see how it holds up over the winter. Winters in New Mexico tend to be mild, so I’m hoping that the Mavis furnace will be available for friends in Albuquerque to use for some time to come.
The Mavis furnace, teapot stand, and some crucibles
