La locomotiva . g questo tipo di carburante. Olio minerale, distillati distillati di catrame di lignite scisto e catrame, oreven alcuni oli vegetali possono essere utilizzati come base di blau gas. Whenmineral sono gli oli usati, circa il dieci per cento del greggio - representingthat parte compresa tra il kerosenes e gli oli lubrificanti - issprayed in una replica riscaldata a circa 600 gradi centigradi, dove itvolatilizes e quindi si scompone in gas, tar, coke e lampblack. Thegas, che consiste della luce idro-carburi, viene liquefatto mediante una pressionedi circa 100 atmosfere e viene memorizzato in cilindri di acciaio, convenientfor h

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The Locomotive . g this type of fuel. Mineral oil distillates, distillates from lignite tar and shale tar, oreven some vegetable oils may be used as the base of blau gas. Whenmineral oils are used, about ten per cent, of the crude — representingthat part lying between the kerosenes and the lubricating oils — issprayed into a retort heated to about 600 degrees Centigrade, where itvolatilizes and then breaks up into gas, tar, coke, and lampblack. Thegas, which consists of the light hydro-carbons, is liquefied by a pressureof about 100 atmospheres and is stored in steel cylinders, convenientfor handling. Its heat content is in the neighborhood of 26, 500 B. t. u.per pound. 1929. THE LOCOMOTIVE 153 Cast Crank Pin Proves Stronger Than Disc IT will take more than the accompanying photograph of an enginebreak-down to settle the old argument as to whether casting a semi-steel crank j^in and crank disc together makes as strong a job asshrinking a steel pin into the disc. However, it is evident that the cast. pin shown here was sufficiently strong, for it withstood a tremendousshock while the disc itself broke in two. This break-down occurred recently on a Corliss type engine and wascaused by the piston rod breaking ofif underneath the nut at the headend of the piston. The nut dropped down, jammed between the pistonand cylinder head, and broke ofif the whole end of the cylinder at thecenter line of the head-end valve chambers. At the same time the guidebarrel, cross-head shoe, and crank disc were broken. The practice of casting the pin in one piece with the disc is opposed 154 THE LOCOMOTIVE J^^^^o- by some on the ground that it is difficuh to avoid blow-holes and shrink-age strains when making a piece which consists of a bulky part joinedto a thinner one, such as a pin on a disc. On the other hand, designerswho favor this method point out that a steel pin is prone to work looseand, moreover, unless fitted accurately to the hole in the disc, sometimesbreaks ofif. If the pi

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• bookcentury1800
• bookdecade1860