Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 280
th that of the large chim-ney (t. One of these valves, marked i, which is of the kind called the lever safetij-vahe, can be regu-lated to any required degree of pressure by the engine-driver, being furnished with a xpring-balance, bywhich the amount of pressure is distinctly indicated. The other… … To indicate the height at which the water stands in the boiler, and to enable the driver to keep italways at its proper level, a set of gage-cocks and glass tube J, communicating with the water inside,are fixed at a convenient situation near the foot-plate. A graduated scale is fixed behind the…
Mechanical engineering · Mechanics · Engineering
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