WEEKLY G, for a vacuum gage. The pipe, F, is pro- a plug, or other means, and the instrument is either as a pressure or vacuum gage by At No. 128 Fulton street, (Sun Buildings,) New York, vided with a cock, H, for passing off any changing the connections from a boiler to a in working order. The… … chamber, without the necessity of employing any communicating means with the exterior under the sole control of the engineer, and through the brass dial plate will at all times ed in the chamber, C, to admit of the ready dial plate likely to affect the accuracy of enables him to test its accuracy…
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