Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 282
rm symmetrical with that of tin- lar_n> chirm ■ . One of these valves, marked i, which is of the kind called the lever safety-valve, can beland to any required degree of pressure by the engine-driver, bein^ tarnished with a tpring-baianwhich the amount of pressure is distinctly indicated. The… … To indicate the height at which the water atanda in the boiler, and to enable the driver to keep italways at its proper u cocks and glass twin j. communicating with the water inside, are fixed at a convenient situation near tin1 loot plate. A graduab I fixed behind thi tube, and the required level…
Mechanical engineering
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