Fred T. Hodgson · Frederick J. Drake and Co. · leaf 437
unfixed to facilitate the release of the cast.The primitive method is to fix the various parts of themould with screws. This is a slow and unreliableprocess, as the continual screwing and unscrewing for HOW TO USE THEM 433 each cast soon wears the screw-holes, and the sides be-come loose and out of… … —Wedge Mould for Casting Blocks, MouldedLintels, &c. NO. 27. Thumbscrews to fit into iron sockets are also used,but they are too expensive for ordinary work, and areunsuitable for small moulds. One of the most simpleand reliable methods is the wedge mould, inventedby an architect. It is easily…
