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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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I

PAtlT XII.

Gas Mains , and Branch Pipes.

The name of mains , is given in the strictest senseof the word, to the cast-iron pipes from two inchesin diameter and upwards, placed under ground,for conveying the gas into smaller branch pipes ;but in a more extended sense, the term is appliedto every pipe from which smaller ramificationsor branch pipes proceed.

All mains destined to convey coal gas should beproved, they should be submitted to the trial ofsustaining a column of water 300 feet high, and thepipe should be rejected if the least moisture ap-pears on any part of the side of the pipe whilst sub-

 
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