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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1883 Excerpt: ... for the most favorable consumption of gas, while a slight blowing force is equal to the highest pressure in the mains of gas companies; the first example is about equivalent to two or three-tenths pressure, and the second to from 3 to 5 ins. pressure. The orifices of gas burners should be well proportioned, not too small, to require increased pressure to expel the gas, thus seriously curtailing the light, as shown by the following experiments with 4 Argands, all of one size, each having 15 holes, but the orifice of each graduated so that only 5 cubic feet of gas per hour could pass under tiie respective pressures here intimated:--Gas issuing with Pressure in tenths of inches. l-10th yielded the light of 12 candles. 6-10ths" "6" 10-10thg" « 21" 40-10th»" "1-6" On the other hand, if the orifice of an Argand burner Is too large the flame will smoke offensively and thus entail waste and loss. Grade the size of the orifice by the quality of the gas to be consumed; for poor gas the holes may be large; for good gas, smaller holes may be used. In every case bo careful to effect a correct adjustment in order to obtain the best results. Yoxttmes or Gas Discharged' Per Hour Under A Pressure, Of Half An Ikch Of Water--Specific Gravity Of Gas-42. Diameter And Lenoth Op Gas Pipes To Transmit Given Volvmm Of Gas To Branch Pipes.--Dr. Vre. To Determine The Size Of Gas Pipe Required--London Rule.--For 200 lights, 2 Inch tube; 120 lights, 1% inch; 70 lights, 1% inch; 60 lights, 1 inch: 25 lights, % inch; 12 lights, % inch; 6 lights, % inch; 2 lights, % inch. Diameter And Extreme Length Of Tubing And Number Of BurnErs Allowed--American Standard. Diameter And Length Of Pipe From The Main, Together With The Number Of Lights All...