ver, J, holding tho rack station-ary, keeps the plate from turning ; and it is so helduntil the cams, c c, again act upon the levers G andI, so as to elevate and retract the plate rod as beforeexplained. This done, the cam c, releases the lever,J, and the spring depressing its outer or rear… … attained will be understood from the following de-scription of its operation. The divided nut, A, being in gear with the screw,B, and the bevel pinion, C, being in gear with thepmion, D, as shown in Fig. 1, rotation is impartedto the shaft, E, by steam or any other suitablepower. This communicating…
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