. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . fifth of a common musical scale, which har-monize and produce an agreeable musical chord. Thisclass of steam whistle is more penetrating and can beheard at a greater distance than the common whistle. It has been found by experience that whistles usedunder high pressure, and they are to-day generally soused, are sounded and operated with difficulty andgreat exertion. To meet this difficulty, that is to soundwhistles of any size, no matter what the pressure is,wi
. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . fifth of a common musical scale, which har-monize and produce an agreeable musical chord. Thisclass of steam whistle is more penetrating and can beheard at a greater distance than the common whistle. It has been found by experience that whistles usedunder high pressure, and they are to-day generally soused, are sounded and operated with difficulty andgreat exertion. To meet this difficulty, that is to soundwhistles of any size, no matter what the pressure is,with little effort, this whistle was designed. The ease ofoperation can readily be seen by examination of the only valve which must be operated by force is thesmall one b, which is held closed by a spiral spring cpressed to the foot of lever d. A slight pull on this leverpushes inward the valve and permits steam to flow intochamber e and to open automatically the large valve / LOCOMOTIVE STEAM WHISTLE. 85 and sound the whistle. By this device the largestwhistles under the highest pressure of steam are op-erated with PLATE STEAM CHIME WHISTLE 86 LOCOMOTIVE STEAM-GAUGE. Operation. The pressure in the locomotive boiler isindicated by an instrument known as a is a great variety of such instruments in use, whichmay be divided into two classes. Only the tyjte mostcommonly used will be described. The steam pressure acts on the inside of the brasstubes AB (Plate 17), which has a tendency to straightenthe tubes, thus spreading their ends, to which is at-tached a bent lever C, which imparts a movement tothe hand D. The hand indicates on the gauge dial thenumber of pounds pressure which cause it to move tothe position indicated on the gauge. Steam-gauges areadjusted when cold. The delicate mechanism of the gaugeis adjusted to resist certain pressures and correctly indi-cate them when all parts are at a given steam-pipe, which connec
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Keywords: ., bookauthornationalcorrespondenc, bookcentury1900, bookdecade1900
