. Science of railways . Fig. 1. Coal Passer Raised as in Operation. The Ryaii-Johnson coal passer herein describedconsists of a supplementary hopper D, shown inFigs. 2 and 3, which is connected to the bottom ofthe coal-pit by means of strong cast steel hingesas indicated at E, a tee piston-rod C is connected (705) 706 LOCOMOTIVE APPLIANCES. to the back end of the hopper by the connection Fand to the piston head B, which is provided witha buffing spring as shown in the cylinder A, whichis placed in the water space through the tender-tank, the cylinder being provided with suitablerelease and dra
. Science of railways . Fig. 1. Coal Passer Raised as in Operation. The Ryaii-Johnson coal passer herein describedconsists of a supplementary hopper D, shown inFigs. 2 and 3, which is connected to the bottom ofthe coal-pit by means of strong cast steel hingesas indicated at E, a tee piston-rod C is connected (705) 706 LOCOMOTIVE APPLIANCES. to the back end of the hopper by the connection Fand to the piston head B, which is provided witha buffing spring as shown in the cylinder A, whichis placed in the water space through the tender-tank, the cylinder being provided with suitablerelease and drainage ports A and G. By admitting pressure into the cylinder beneaththe piston head, the T piston is actuated to its fullstroke as shown in Fig. 3. The upper port beingwide open to the atmosphere allows the pressureto escape before the spring comes in contact with. Fig. 2. Coal Passer liowered in Normal Position. the buffing plate; the buffing spring provided foron the piston head acts as a cushion and absorbsthe balance of the shock. The hopper being raisedin this manner, moves the fuel forward in thecoal-pit. By closing off the pressure, the weightof the hopper forces it to return to its originalposition, the piston head on its downward strokeafter passing the upper release port forces theentrapped pressure which now acts as a cushion, LOCOMOTIVE APPLIANCES. lo: out through the lower exhaust and drainage portG, which is only 3-16 of an inch in diameter. Thismovement allows the hopper to settle gradually toits normal position as shown in Fig. 2.
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Keywords: ., bo, bookcentury1900, bookdecade1910, bookidscienceofrailway14kirk
