. Science of railways . with pony truck, it can be so placed byremoving the spool plate and loosening the set screwthat holds the clutch in center of shaft, then removethe shaft and end bearings and reverse them. The worms and clutch collarshould be left in pulley.—Theflange M-3 is screwedonto the main part M-1,and is held in positionby latch M-4. The di-ameter is adjusted, or the_ point at which the belt Fig. a runs is varied, by mov- RecorderPulley—Boyer Speed • ^r, ^ ± ^ Recorder. lug thc flange to or from the main part. This adjustment is enough to allowfor a change of ab
. Science of railways . with pony truck, it can be so placed byremoving the spool plate and loosening the set screwthat holds the clutch in center of shaft, then removethe shaft and end bearings and reverse them. The worms and clutch collarshould be left in pulley.—Theflange M-3 is screwedonto the main part M-1,and is held in positionby latch M-4. The di-ameter is adjusted, or the_ point at which the belt Fig. a runs is varied, by mov- RecorderPulley—Boyer Speed • ^r, ^ ± ^ Recorder. lug thc flange to or from the main part. This adjustment is enough to allowfor a change of about three inches in the diameter ofa car wheel. The belt should be coupled by means of the plyersfurnished, similar to the manner in which the coup-ling is fastened in one end of the belt sent with therecorder. Cut the belt of such a length that it will requirestretching about eight per cent, to put it in place. Speeding.—^The pulley on recorder should make sixhundred revolutions per mile. The diameter of this. 622 LOCOMOTIVE APPLIANCES, pulley is determined by dividing 63,360 (the numberof inches in a mile) by the circumference of the carwheel in inches, which gives the number of revolu-tions of the car wheel per mile; this result, multipliedby the circumference of the axle pulley in inchesand the product divided by 600, will give thecircumference of the adjustable pulley on therecorder. £a:amp/^.—Suppose the wheel be 94 inches incircumference and the axle pulley 17% inches incircumference, then 63,360 in. X 17% 600 = inches, the circumference of recorderpulley. To set this pulley to the proper size, take a piece ofwire belt the exact length the circumference should be,and adjust the flange of the pulley by raising thelatch and turning it until the ends of the piece of beltwhen passed around will just meet. Be careful not tostretch the belt in measuring. The axle pulleyshould be measured the same way. (It would bewell to measure the axle pulle
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