Railway and Locomotive Engineering . 17 from the clutches thegears 32 and 31 are keyed to the shafts,so that they turn with the gears also mesh with each otherand therefore must always turn in oppo-site directions. It is evident, then, thatas the clutch 22 receives its impulse uponone stroke of the rack and 21 receivesits on the other, the gears 31 and 32 mustturn at each stroke and that 32 must al-ways turn in the same direction, receivingintermittent impulses with each stroke ofthe engine piston and the rack. The gear 32, which it will be remem-bered, always moves in the same
Railway and Locomotive Engineering . 17 from the clutches thegears 32 and 31 are keyed to the shafts,so that they turn with the gears also mesh with each otherand therefore must always turn in oppo-site directions. It is evident, then, thatas the clutch 22 receives its impulse uponone stroke of the rack and 21 receivesits on the other, the gears 31 and 32 mustturn at each stroke and that 32 must al-ways turn in the same direction, receivingintermittent impulses with each stroke ofthe engine piston and the rack. The gear 32, which it will be remem-bered, always moves in the same direc-tion, under ordinary operating conditions,meshes with the gear 34, which is on the?main driving shaft that extends back to-the tender for the purpose of driving the•conveyor screw; the exact arrangementof which will be explained later. This shaft carries the gimbal connec-tion 35, which is thus always rotated inthe same direction and with the same in-termittent motion as the gears 16 and 17,and the piston of the For the driving of the two inclinedlifting conveyors the gear 31 has themiter gear 33 made solid with it. Thismiter gear 33 meshes with a similar gear36, to which the spur gear 37 is at-tached. This latter gear meshes with thegear 38. and this in turn with the gear39, so that the whole train of 37, 38 and39 move together and always in the samedirection, so far as each individual gear the lower end of the shafts of the liftingconveyors, by which the coal is raisedfrom the discharge end of the longitu-dinal conveyor to the point at which itis discharged at the sides of the fire door,all having an intermittent action. If now for any reason it is desired toreverse the action of the conveyorscrews, the rod 18 is pushed out so thatthe clutches 21 and 22 are disengagedfrom their mates on the gears 17 and 16respectively. This draws the end of thelever 28 away from the gear box andpushes the end 20 in until the clutch 25engages its mate on the gear IS. Thesecl
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