. Library of universal knowledge. A reprint of the last (1880) Edinburgh and London edition of Chamber's encyclopaedia, with copious additions by American editors. to be of great service in even cases ofAsiatic cholera. The injection of blood into the veins is described in the article Trans-fusion OF Blood. INJECTOR, Giffards, is now in general use for feeding w^ater into stenm-boilers,particularly locomotive boilers. Feed-pumps are difficult to keep in order when drivenat high speed. The very rapid action of the valves severely tries their durability. Inthe case of locomotives, inco
. Library of universal knowledge. A reprint of the last (1880) Edinburgh and London edition of Chamber's encyclopaedia, with copious additions by American editors. to be of great service in even cases ofAsiatic cholera. The injection of blood into the veins is described in the article Trans-fusion OF Blood. INJECTOR, Giffards, is now in general use for feeding w^ater into stenm-boilers,particularly locomotive boilers. Feed-pumps are difficult to keep in order when drivenat high speed. The very rapid action of the valves severely tries their durability. Inthe case of locomotives, inconvenience was often occasioned by the fact that (heirfeed-pumps acted only when they were running; and thus, if an engine happened tostand still for any length of time, the water occasionally got too low in the boiler. Theinjector acts equally well whether the engine is running or at rest. The diagram fig. 1 will give an idea of the essential parts of the injector. A is thesteam-boiler, B being the water-level, CDF a pipe into which steam is admitted: thispipe terminates in a cone DF, which is inclosed in a larger cone HH. In the cone DF, Injunction,luk. 24. Fig, the pointed plug E can be raised or lowered so as to increase or diminish the areaof the aperture at its lower end F. G is a pipe connnuni-cating with the water-cistern, and adinittiiiu- waterinto the external cone HH. K is a pipe conununi-catingwitli the boiler under the water-levei. On open-ing communications between the boiler and thisapparatus, it might be expected that steam wouldrush out at F, and water at K, both currents meet-ing with great force, and escaping into the atmospherebetween tlie two openings. Paradoxical as it mayappear, the outtio wing stream of water at K, althoughit is actually flowing undera greater pressure than thecurrent of steam escaping at F, due to the Juxid ofwater arising from the dilference of level between theaperture at K and the water-level at B, isoveipowered,and driven back into t
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