. The universal assistant, and complete mechanic : containing over one million industrial facts, calculations, receipts, processes, trade secrets, rules, business forms, legal items, etc., in every occupation, from the household to the manufactory. ne Boilers, 8 to 11 square feet; Loco*motive Boilers, 5 to 6 square feet. MACHINISTS, ENGINEERS, AC, RECEIPTS. 395 RfLE to FrST> THE WEIGHT NECESSART TO PUT OS A LevER^EN THE AREA OF VALVE, LeVER, &C. ARE KNOWN.—Multiply the area of valve by the pressure in pounds per square inch; multiplythis product by the distance of the lever from the fulcrum
. The universal assistant, and complete mechanic : containing over one million industrial facts, calculations, receipts, processes, trade secrets, rules, business forms, legal items, etc., in every occupation, from the household to the manufactory. ne Boilers, 8 to 11 square feet; Loco*motive Boilers, 5 to 6 square feet. MACHINISTS, ENGINEERS, AC, RECEIPTS. 395 RfLE to FrST> THE WEIGHT NECESSART TO PUT OS A LevER^EN THE AREA OF VALVE, LeVER, &C. ARE KNOWN.—Multiply the area of valve by the pressure in pounds per square inch; multiplythis product by the distance of the lever from the fulcrum • multiplyj the weight of lever by one-half its length (or its centre of gravity) •? then multiply the weight of valve and stem bv their distance fromthe lulcrum ; add these last two products together, and subtract from the first product, and divide the remainder bv the leugtlkol lever ; the quotient will be the weight of the ball.—i?o/3er Example: Area of valve 7 sq. , . (iOlbs. Fulcrum 3 ir Length of lever 24 in. 60 Tin. 420 12fi0. 126 lbs. 24) 1134 lbs. 9 in. 108 lbs. 126 lbs. 6 ISlbfc Weight of lever 9 lbs. lbs. weight of of valve and stem 6 Maeiot: —Dwffes to mrrchinen/ ichen in Harbor hpforegetting under Stram, hi a Practical Enqineer. When an engineertakes charge of the macliinery of a boat his first attention ought to bedirected to his boilers; for, being the source of power, they may be--come the source of great danger if not properly looked after. In in-epectmg the boilers, three tilings reqirire special rttention. 1. Thothickness of the plates above the fires and other places of Ihe state of the stays. 3. The position of the gauges, viz.: tho•water gauge, cocks, and glass water gauges. Respecting the fii-st, ageneral pLm is to drill a small hole through fiie plate, and thus findJts real thickness, for it is often the case that a boiler plate may befa
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Keywords: ., bookcentury1800, bookdecade1870, booksubje, booksubjecttechnology
