This was the second use of the oval mark V. The base is a 30x60cm oval matching one of the bases found at Ribe. This style can be set with two working ports - one on each short side. The port for the bellows is in the center of the long side. Opposite that port is a chute for loading charcoal currently blocked with a crucible for annealing. At the top are two chimneys with another pot for annealing between them. The chimneys were built a bit smaller than the mark III and the annealing pot a fair bit deeper.
We filled the annealing pot with sieved ash and got some good annealing temperatures in that location. The crucible was rather too warm for annealing this time.
This melt was targetted at a smaller group of experienced bead makers. This allowed us to spend more time making beads, learning more about working with the tesserae, and eliminating one variable (skill) from the annealing problem. We also got some good pictures and video of the activities.
|Scaled Drawing||Fire zones||Turning Reticella||Heating tesserae|
|Winding on tesserae||Working in the chimney||Marvering for shape||Marvering|
|Pulling stringers||Working multiple beads||Putting beads in the annealing pot||Adding decoration|
|Taflmaðr||Darrell's better beads (and taflmaðr)||Rob's better beads||Jean's better beads|
A type K thermocouple was employed to roughly measure exhaust gas temperatures at one of the top ports over the experiment. A roughly 6 mm (1/4 inch) diameter hole was drilled into the wall of the furnace, just down from the lip of of the port. The probe was extended into the opening about 1 cm. Although the probe was placed early in the experiment, and readings were constantly monitored, unfortunately the recorded data currently extends over a relatively short time sequence. Since the thermometer was included in the frame of the overview video shot we will be able to extend this table when we have time to analyze the video in depth.
We confirmed that Darrell's tesserae method worked repeatably. It is unlikely to be the only usable method but it can work and we have some good video of it
A video of working with tesserae can be seen on youtube