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mber 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 registering the speed of railway-trains. The governor is connected with a pencil, which rides over a recording sheet and indicates the speed, while the sheet is moved by the axle of the car and indicates the distance passed over. The following are not actuated by governor-balls:— English patent, No 1,407, of 1863, makes a diagram on a sheet of paper, showing the speed of a train, with the position and duration of its stoppages. The paper is advanced by