|The Mk 5 furnace is again laid out with working areas for two people, one on either end of a roughly oval furnace, which has air input and charcoal loading on either sides of the centre. At the top centre is a built in cup for annealing, for this test holding sieved wood ash. The loading port has a second cup which inserts into the opening. In this test this second cup held vermiculite.|
Each worker has the choice of using an upper port, allowing for manipulation of the glass in the hot exhaust gasses. A second covered port in the side of the wall can be opened, allowing for working down inside the body of the furnace.
Text © Darrell Markewitz, 2017
Photographs © Darrell Markewitz, 2017
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