. Science of railways . Section of Engine House Showing Straight-Port Valve Used for the Blower Line and Also Washout, Blow-off and Refilling Line of a Hot Water Washout System (See Blow-off Valves for Description) f WATER GAUGES AND GAUGE COCKS. In order to determine the height of the water in theboiler, a glass water gauge is attached to the boiler(see plate American Type Locomotive, part ) by which the engineer can see at a glancethe water plain wat-er gauge is sofamiliar to theordinary prac-tical man thatit will be suffi-cient here toillustrate anddescribe a few^of the impr
. Science of railways . Section of Engine House Showing Straight-Port Valve Used for the Blower Line and Also Washout, Blow-off and Refilling Line of a Hot Water Washout System (See Blow-off Valves for Description) f WATER GAUGES AND GAUGE COCKS. In order to determine the height of the water in theboiler, a glass water gauge is attached to the boiler(see plate American Type Locomotive, part ) by which the engineer can see at a glancethe water plain wat-er gauge is sofamiliar to theordinary prac-tical man thatit will be suffi-cient here toillustrate anddescribe a few^of the improvedforms whichautomaticallyshut off the flowof steam shouldthe water glassbreak while inservice. Fig. 1 showsa combineddrip-cock andautomatic water gauge. The automatic device orball (D) is moved and agitated every time the handleis turned and gauge glass blown out through the 329. Fig. Automatic Water Gauge. 330 LOCOMOTIVE APPLIANCES. valve (E) to waste pipe at G, and cannot, therefore,become stuck fast by lime or other sediment. It willreadily be seen that it is impossible for the two littleballs to go to their seats exceptwhen the glass breaks andthey take the positions shownby dotted lines. To blow off, the lower handleis turned a half turn to theright, or toward the closedposition for valve (F). E is 3, double-seated valreshown by Fig. 1 as off fromboth seats, its position when -the gauge is being blown off,which is accomplished by sim-ply turning the lower handle,no pet cock being used. Thesteam follows the course shownby the arrows (B) to the cut-let (G), the steam pressure beingdoivn on the ball. In closing,the partition at the left of theball (D) prevents the action ofthe boiler pressure from sud-denly moving the ball to itsseat. If, however, the glassbreak, the rush of steam to theglass, via arrows (A), causesan eddy or vacuum whichimmediat
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