Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing co. · leaf 123
of two strips of metal,steel, riveted together. … 409. SPRING STEAM TRAP.—A differ-ential expansion of the spring itself causes itto open with the water temperature and closewith steam temperature. The spring is madethe upper one of brass and the lower one of 410. S T E.AM T R A P.—The water con-densed in a heating system flows into the trapcase…
Mechanical movements
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