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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. Report Next Text © Darrell Markewitz, 2017 Photographs © Darrell Markewitz, 2017 Copyright details Contact us |