. Science of railways . points on the run. Application of recorder.—In applying a Boyerspeed recorder to a locomotive with a four-wheeltruck, it should be bolted on the frame over therear-truck axle, with wheel inward. It is usuallynecessary to bolt a plate of iron on the frame and toset the recorder on that in order to get it far enough infor the belt to pass the truck-box. The pulley todrive the machine should be clamped on the axle, inline with the machine pulley. This pulley is in two pieces, with a liner between atone side, and should be bored to fit loosely on theturned part of the axle,
. Science of railways . points on the run. Application of recorder.—In applying a Boyerspeed recorder to a locomotive with a four-wheeltruck, it should be bolted on the frame over therear-truck axle, with wheel inward. It is usuallynecessary to bolt a plate of iron on the frame and toset the recorder on that in order to get it far enough infor the belt to pass the truck-box. The pulley todrive the machine should be clamped on the axle, inline with the machine pulley. This pulley is in two pieces, with a liner between atone side, and should be bored to fit loosely on theturned part of the axle, and when clamped around theaxle, the liner should be left out. When necessary to move the pulley along the axlethere need be only one bolt loosened. In applying recorder to an engine with a ponytruck, a disc of suitable diameter, with groove in edgefor the belt, should be fastened to the end of the axle,with a cap-screw in center. The recorder, in this case,may be placed on the wheel-guard. 618 LOCOMOTIVE LOCOMOTIVE APPLIANCES. 619 After the machine has been secured in position,place the gauge in the cab where it may be easily seenby the engineer. (It may be fastened on the samebracket that holds the steam-gauge.) Before the gauge can be fastened it is necessary toremove the dial, in order to put the screws for fasten-ing through the countersunk holes in back. (The dial can be removed from the gauge by loosen-ing the screws and turning it around until the notchwill pass one of the screw heads.) After fastening the gauge, run a one-eighth-inchgas pipe from it to the recorder. Get it straight aspossible, using the elbows containing sheaveswherever necessary. The pipe may be carried alongdirectly und^r the hand rail and firmly secured theretoby clamps or fastened on the running-board. Before the pipe is screwed together there should be athread or small cord passed through each piece, theends tied together and drawn in. After the pipe,recorder and gauge are in posit
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