elastic mold

Elastic molds of glue for taking casts of undercut objects were invented by Douglas Fox. The body to be molded is oiled and secured about an inch above the surface of a board, and is then surrounded by a wall of clay rather higher than itself, and about an inch distant from its periphery. Into this, warm melted glue, just fluid enough to run, is poured, completely enveloping the object. When cold, the clay wall is removed, and the mold delivered by cutting it into as many pieces as are required, either with a sharp knife or by threads previously placed in proper situations about the object. The pieces are then placed in their proper positions and bound together. The mold is designed particularly for taking casts in plaster-of-paris, but molten was, if not too hot may also be employed.