Catechism of Central Station Gas Engineering in the United States

between the hydraulic main and the exhauster contains gas at a partial vacuum, while the apparatus beyond the exhauster is under pressure. 4th. Condenser ; because it is important to cool the gas before it comes in contact with the water which is to absorb the ammonia. The cooler the water and gas the more ammonia will the water absorb per gallon. 5th. Washer and scrubber ; because better purification results are obtained in the purifying boxes, and a greater yield of ammonia in marketable form, that is, in liquor, if the washer and scrubber precede the purifiers. 6th. Purifiers ; because when the gas has been through the apparatus referred to above it is in condition to enter the boxes and give up its sulphur impurities and carbonic acid to the purifying material, if this is lime ; or to give up its sulphur impurities only, if the purifying material is oxide of iron. . 6. Give the name of each part of the apparatus used in the manufacture and distribution of water gas, beginning at the generator and ending at the consumer's burner. Ans. "Generating apparatus, wash box, scrubber, condenser, relief holder, exhauster, centre seal, purifiers, station meter, storage holder, street main governor, street mains, service pipe, meter connections, consumer's meter, house pipe, fixture and burner." 7. Name the principal pieces of apparatus necessary in a carburetted water gas works, and state briefly the function of each. Ans. The principal pieces of apparatus nece...