. Railway and Locomotive Engineering . complete con-densation takes place, and the com-bined jet flows at a velocity sufficientlyhigh to carry it forward through thedelivery nozzle into the boiler. A series of can-fully conducted testson the Great Western Railway of Eng-land under ordinary conditions hassliown an actual economy of eight or pounds for each square inch of order to meet the exigencies ofhigh pressure service, there is a livesteam nozzle of small bore at the en-trance to the main exhaust nozzle. Asshown in the accompanying illustration,it obtains its steam supply through t
. Railway and Locomotive Engineering . complete con-densation takes place, and the com-bined jet flows at a velocity sufficientlyhigh to carry it forward through thedelivery nozzle into the boiler. A series of can-fully conducted testson the Great Western Railway of Eng-land under ordinary conditions hassliown an actual economy of eight or pounds for each square inch of order to meet the exigencies ofhigh pressure service, there is a livesteam nozzle of small bore at the en-trance to the main exhaust nozzle. Asshown in the accompanying illustration,it obtains its steam supply through thepassage shown in the exhaust valvecasing from a pipe connected to thesupplementary steam valve on theboiler. The small jet of steam intro-duced through this nozzle gives theadditional force required to feed theboiler under extra high pressures. Ad-justable valves regulate the exhaustsupply and also the high pressure sup-ply, and it may be readily understoodthat it is sometimes necessary to workthe injector as a live steam portion of the exhaust steam can Ijeutilized in operating the injector therewould be a considerable gain in theeconomical use of steam. It wouldseem at the first glance that the lowpressure of the exhaust steam would beinsufficient to meet the requirements ofthe force necessary to inject water intothe boiler against a pressure manytimes higher than the exhaust steamcould possibly be, but this assumptionis based on an erroneous idea of theactuating princi]jlc which operates theinjector. This seeming impossibility,however, is easily explained when theaction of the exhaust steam on thewater is considered. .• injector may be defined as anapparatus in whicli a jet of steam mov-ing at a liigh velocity is condensed by abody of water moving at a low velocity,the momentum of the steam jet movingwith a resultant velocity sufficient to^■vcrcome the boiler pressure. .\s iswell known, exhaust steam at atmos-pheric pressure has no velocity, but willmove, cl
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