. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . cord of wood for $5 wouldbe consumed, and other expenses, such as bottles, assay supplies, etc., would amount to $5additional ; depreciation, estimating the plant to cost $5,000, would amount to |2 50 a day,making a total expense of $61, or $1,830 a month—an averaee of $915 per ton ; thus leav-ing but a small margin of profit in hand-sampling proper. The profits are usually derivedfrom the samplers connection with t
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . cord of wood for $5 wouldbe consumed, and other expenses, such as bottles, assay supplies, etc., would amount to $5additional ; depreciation, estimating the plant to cost $5,000, would amount to |2 50 a day,making a total expense of $61, or $1,830 a month—an averaee of $915 per ton ; thus leav-ing but a small margin of profit in hand-sampling proper. The profits are usually derivedfrom the samplers connection with the ore buyers and smelting works, having reduced ratesfor reduction, as well as tariff arrangements with the railroads, enabling tliem to purchaseores to great advantage. In many cases they act as agents for the smelting works on com-mission. The greater portion of the sampling works in the United States are in Colorado, wherethe railroad faciliti(!S are admirable. There is hardly a mining camp in the State whichdoes not contain one, while in California there are but two, in Nevada but one, three in Idaho,six in Montana, five in Utah, and a few in New Mexico and Fig. -Mixer and diviLler. Oven, Coke : see Coke Ovens. 004 PACKING. PACKING. Corrugated Copper Gaskets, shown in Fig. 1, are now used for packingpipe joints, ihey are made of thin sheet-copper, stamped with concentric corrugations,which on compression tiatten out and i)rodace a complete metal union. Tiiey are notimpaired by heat or cold, and can not blow out. From 3 to 6 corru-gations inside the bolt circle is ample to insure a permanent are made in any desired shape. Many varieties of packings forjoints are now in the niarket. made of paper, rubber, cotton, asbestos,graphite, or combinations of these and other materials. Some of theseare of compositions which are kept trade .^ecrets, and they are known inthe market by arbitrary names,such as Vulcanized Fibre. Vul-cabeston, Usudurian, etc., orby t
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
