Elastic Moulds
These moulds are for the purpose of obtaining casts, in plaster or wax, from medals and other objects having parts that are undercut. The moulds are made by surrounding the object with a barrier of clay as high as the thickness of mould required, and, after oiling the surface, filling the space with melted glue, which, when cold, can if necessary be cut in suitable pieces for delivering smoothly. The pieces, when put together again, form the mould in which to run the plaster or wax. If the undercutting is not too deep, these moulds will yield sufficient to admit of ordinary flat casts being taken whole, without cutting. See PLASTER-CASTS; UNDERCUT.