The Locomotive Of Today

52 The Boiler: Injectors. clack should be leaky. It is no doubt owing to the simplicitv and general adaptability of this injector, for it can be adjusted longUinafa”ourany °f **“* * haS SUrvived s° r . ,If ab°ve-described injector should “fly off” as it is iable to do when the engine is passing over points or cross- nf lf S1top1ped sV-ddenly, and the continuity of the stream of water js broken, the steam and water must be shut off, and the injector re-started. lo overcome this disadvantage, manv h theSi^rt en ‘'T'1' Among the best known of these s the mjector made by Messrs. Gresham & Graven, in which vXnb"’'nti C°ne 1S prov!ded with a movable portion, which, at thA mjector stops, moves and allows the pressure to escape verflow; when so reheved the steam jet forces it back, ‘ d lnJector starts agam, without any external regulation whence the name “ re-starting ” to this class of injector. One orm is shown at B in three sections; it is called the “ com- mation mjector, because in one fitting are ^rouped the steam cock, water regulating cock, warming cock, and ston valve, with all necessary handles for controlling them. The steam is brought to it from the dorne, as is necessary for all injectors, and the delivery pipe is carried in through the back botlpr °or1the to.p.of the firebox towards the front of the th/v? ki" °ne,J°lnt 1S made on the boiler; steam enters t ie lowerhole and passes up the centre of the cones, which are arranged m the opposite direction to those in the last . ample> that is with the steam cone lowest, water and com- bimng cones and movable valve next, and the delivery cone uppermost; the three first mentioned are diminishing cones and the latter an enlarging one. When necessary to examine toPnLhS Pæs^ure’ the stoP valve may be screwed home enable this to be done, lo warm the feed water the cock the overflow pipe must be closed, and the water valves openecl, the steam then blows through to the tanks. iniPef116 *?rinCXle °f this re’starting device is applied to jectors placed honzontally as well as vertically, with equally satistactory results. y . r4not^r weli-known form is shown in vertical section at C in which the steam enters at the right-hand cone, water } e coc shown next, both enter the combining cone, and pass together across the overflow gap into the receiving- cone uPYards’ hftmg the back pressure valve, and along’ “ i C ” - ve^y piPe- lhe pnnciple on which this injector iJeppartSf k that of the “flaP nozzle.” The combining cone % 1 be Spllt axiall.y> and hinged at the largest end • w en the stream of water is broken, as before, by jolts, etc/