358 MODERN STEAM PRACTICE . The use of this guard piece is to allow a wedge to be driven between it and the brass block , which contracts the spring ring ; the piston is then placed in the cylinder , and when the … — Piston R imbedded in the metal , and soon play havoc Block Piece . with rubbing surfaces . A , Piston . b , Packing ring . The piston rod is secured by a nut , sometimes C , Junk ring . D , Bolt and recessed nut . e , Block and placed at the top , in other cases at the bottom , guard . square…
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