. Science of railways . of the Duplextype being formed by two coils of wire attached, directly oppo-site each other to two threaded composition connections. Thesetwo coils are wound so that they have the same pitch. This 600 LOCOMOTIVE APPLIANCES. arrangement eliminates tendencies of the piston to cock, orbind, such as is liable where the single coil springs are em-ployed. With a Tabor Spring friction of the piston is reducedto an absolute minimum and greater accuracy is employment of two wires in the Tabor Spring divides thestrain, materially increasing the life of the spring. Th
. Science of railways . of the Duplextype being formed by two coils of wire attached, directly oppo-site each other to two threaded composition connections. Thesetwo coils are wound so that they have the same pitch. This 600 LOCOMOTIVE APPLIANCES. arrangement eliminates tendencies of the piston to cock, orbind, such as is liable where the single coil springs are em-ployed. With a Tabor Spring friction of the piston is reducedto an absolute minimum and greater accuracy is employment of two wires in the Tabor Spring divides thestrain, materially increasing the life of the spring. There areno sharp turns or angles in the formation of the two coilsand all strains are, therefore, evenly divided throughout. Thewire in the springs of the Tabor Indicator is very carefullyselected from the best spring material which can be securedfor this purpose. This material is uniformly tempered andtested and has a very high elastic limit. Each denominationof spring is of a length which automatically fixes the Atmos-. Fig. Springs. phere Line in the proper location on the card. This arrange-ment does away with any adjustment of the Atmosphere Lineand elimihates a certain amount of lost motion which maytake place in the adjusting mechanism. It also preventsthe breakage of pencil arms and other parts w^hich are liableto occur in certain designs. There is also an outside connected spring instrument asshown in Fig. 1. In designing the Tabor Indicator with out-side connected spring, all the best points of the inside springdesign, that could be employed in the improved instrument,were retained. Under high temperature steam and gas engine LOCOMOTIVE APPLIANCES. 601 > work, the outside spring instrument is a decided advantageover the older form of inside spring design. In the OutsideSpring Type the spring is not subjected to the deterioratingtemperature effect as is the case with the inside springinstrument. Greater accuracy and durability of spring is,therefore, attained
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Keywords: ., bo, bookcentury1900, bookdecade1910, bookidscienceofrailway14kirk
