casting box

casting box

compressible plastic foam (similar to that used for flower arranging) within a box, onto whose surface the weight-bearing foot is placed; the clinician adjusts the rearfoot to produce a near-neutral impression of the plantar contours of the foot in the foam, to create a negative mould from which a positive plaster cast can be made
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The resultant ash called 'Charcoal', combined with soil is put in a casting box and a solid block is prepared which burns much longer than wood, with much less smoke.