r tiles of fireproof construction. Pictured in the accompanying engraving is an im- A, that projects from the forward face of the lower The first course of blocks of which the wall is formed proved steam trap, which is of simple and durable jaw. When the button A is depressed, the dog B is are made… … tion. The uppermost course of blocks differs from AN IMPROVED STEAM TRAP. casing is mounted to oscillate for a limited distance, the others in having -apertures J, which provide com- in order to vary the time of the spark as above re- munication between the interior of the bin and the condensation…
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Internet Archive · Public domain (published before 1931). Free to use for anything.
