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accompanying drawing acid adjoining casting air bubbles Alfred David Lenz Alfred Lenz's method alloy aluminum aluminum-bronze Aphrodite asbestos bicycle pump biography brass tube bronze powder brush burning cavity color crucible Dance dental plaster Druggist's Lead Plaster dumped early experiments entrance February 26 figure fingers and toes finishing flame flask floral castings foot gate and feeders gate-end downward gravel or coke Havana heated hollow hot mercury hot tool hydrochloric acid jeweler's leave Lexz lignum vitae lost wax casting material melted Metal Casting Installation Method of Coring Modeling Wax Formula molten metal motor-driven multiple casting NATIONAL SCULPTURE SOCIETY necessary nitric acid oven paraffine particles patine pedestal piece of plastilene plaster and silex plaster moulds plaster piece-mould portion poured protective covering pump purpose pyrometer removed sculptor spur statuette steam chamber suction surface SYSTEM OF LOST tapered temperature thigh tongs under-cuts vacuum tank valve wall warmed and pulled wax model