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Description of the process of manufacturing coal gas : for the lighting of streets houses, and public buildings, with elevations, sections, and plans of the most improved sorts of apparatus now employed at the gas works in London and the principal provincial towns of Great Britain : accompanied with comparative estimates exhibiting the most economical mode of procuring this species of light / by Fredrick Accum
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238

DIRECTIONS TO WORKMEN, «cc.

made at the bottom of the governor when detachedfrom the metre.

In order at any time to ascertain the pressure ofthe gas in the metre, close the stop-cock whichadmits the gas, and open the aperture G and F,which will shew the level of the water on the scaleboard E. This being first observed, close theaperture G, and open the stop-cock, and the pres-sure of the gas in the metre will be indicated bythe rise of the water on the scale board E, aboveits original height.

 
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