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ther, register the distance traveled; while a second set of prickers, similarly actuated, record the rate of speed at each mile on the same strip of paper. The mechanism is driven from a truckaxle, and is inclosed in a box with a glass front. Keeler, April 4, 1864. An indicator. The balls and connecting arm of an ordinary governor, driven by gear or band connection from the axle, act upon a piston, which raises or lowers the movable bottom of a mercury chamber and elevates or depresses a column of mercury rising from the said chamber. Keeler's speed-measurer. Bowsher, May 12, 1868. An indicator. It has a governor arrangement, the sliding collar actuated by the balls pulling upon a cord, which turns the spindle of the pointer-finger and directs it to figures on a dial. Bilgram, August 22, 1871. An indicator. It has governorballs, which actuate a sliding sleeve-rack, which revolves the pinion on the axis of the pointer. Speed and Poage, May 12, 1874. A recorder for r