The Art of Lead Burning: A practical treatise explaining the apparatus and processes. by C. H. Fay

Author:C. H. Fay [Fay, C. H.]
Language: eng
Format: epub
Published: 2016-09-04T22:00:00+00:00

Fig. 19.—Fire Trap and Scrubbing Cup.

CHAPTER VIII.

THE FLAME AND ITS MANAGEMENT.

Before attempting to light the gas the operator must be sure that all the air is exhausted from the tubes. Otherwise the flame will go back and explode in the tubes or fire trap. To be sure of this the beginner must test the gas. A handy test tube can be made by capping one end of a piece of ½-inch pipe, which should be about 6 inches long. To test the gas, first open wide the gas cock M on the generator, Fig. 1. Then open the gas cock f on the mixing fork and let the gas displace the air in the tubes, which it will do in about one minute. Then invert the test tube, Fig. 20, and hold it over the blow pipe tip for a moment until the gas has displaced the air in the tube. Then quickly place your thumb over the opening of the test tube, which will keep the gas from escaping. Close the gas cock f on the mixing fork, then take the test tube to one side away from the generator, still keeping it inverted, and bring it close to a lighted match or candle. It will light with a pop, and if it is free from air it will burn quietly down in the tube until the gas is exhausted. Continue to test the gas in this manner until it burns as described, when it may be safely lit at the jet without fear of its burning back. This precaution is necessary only after opening the generator for some purpose.

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