64

A TREATISE ON GAS-LIGHT,

come under the shelf in the pneumatic trough,over which I place a jar with a stop-cock anda small tube; the jar being previously filledwith water, the crucible I place on the com-mon or other fire as is most convenient; andas the heat increases in it, the gas is forcedrapidly through the water into the jar, andregularly displaces it. I then open the cockand put fire to the gas, which makes its escapethrough the small tube, and immediately amost beautiful flame ensues, perfectly freefrom smoke or smell of any kind. A largerlight, but not so vivid or clear, will be pro-duced without passing the gas through water,but attended with a smoke somewhat greaterthan that of a lamp charged with commonoil.

“ I have great hopes that some active me-chanic or chemist will, in the end, hit on a planto produce light for large factories, and otherpurposes, at a much less expence, by the aboveor similar means, than is at present producedfrom oil.”

Soon afterwards, Mr. Samuel Cleg, ofManchester, Engineer , communicates an ac-count of his method of lighting up manu-