Journal of the Franklin Institute; devoted to science and the mechanic arts (1826)
Franklin Institute (Philadelphia, Pa.) · Oxford, Eng. [etc.] Pergamon Press [etc.] · leaf 410
a pointer theheight of water (above the lowest ad-missible level,) which is containedwithin the boiler at the time of trial. When it may be desired to ascer-tain the water level, the handle shouldbe moved in the direction of the fig-ures ; the valve, A, is at once lifted from its seat and a passage… … 404 Franklin Institute. Upon restoring the handle to its original position, the valve rodreaches the depression of the cam and the valve is allowed to close. The advantages of this instrument over the gauge cocks commonlyin use, are, its adaptation to denote the exact height of water—itsfreedom…
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