. Revised and enlarged ed. of the science of railways . rst collected in thisreservoir instead of being drawn directly fromthe space above the water, before described, isbecause dry steam is more effective than wetsteam and, as dry steam rises above wet steam,the dome permits their separation. Water is supplied to the boiler, to take theplace of that which has been converted intosteam, by an injector. This is a device or forcepump for supplying the boiler with waterwithout the intervention of the machinery of DESCRIPTION OF LOCOMOTIVE. 77 the locomotive farther than the introductionof a jet of
. Revised and enlarged ed. of the science of railways . rst collected in thisreservoir instead of being drawn directly fromthe space above the water, before described, isbecause dry steam is more effective than wetsteam and, as dry steam rises above wet steam,the dome permits their separation. Water is supplied to the boiler, to take theplace of that which has been converted intosteam, by an injector. This is a device or forcepump for supplying the boiler with waterwithout the intervention of the machinery of DESCRIPTION OF LOCOMOTIVE. 77 the locomotive farther than the introductionof a jet of steam from the boiler into the in-jector. The jet of steam is brought into contactwith a supply of water from the tender andthe water is by this means forced along w4th thecondensed steam into the boiler. While simplein operation, the injector never ceases to excitethe admiration of those who observe its is to the unscientitic mind very much like aman raising himself from the ground by his bootstraps. Its working is, however, in accordance. Side View of Injector. with well known laws, as shown by the illustra-tion. The injector is usually placed inside thecab, where it will be under the immediate eye ofthe engineer. I have descril)ed the injector inconnection with the supplying of the boiler withwater before referring to any other method foraccomplishing this end, because it is superior toall others. It is in very general use. However,as a precautionary measure, many locomotivesare still supplied with the diminutive apparatusknown as a donkey engine, operated by steam 78 RAILWAY EQUIPMENT. from the engine, by which the engineer may atwill (in the event the injector should not work)force the water from the tank into the boiler.
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