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Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
clockactu-ated pencil records time. A third feature: a steam-gage has a pencil attached to record the steam-pressure upon the chart, so that its variations are apparent for all the time occupied in the journey. Richardson's speed-recorder. Wythe's speed-recorder. Wythe's speed-recorder for railway-trains, July 28, 1874. The chart is ruled with cross-lines, for distance and time respectively. It is moved by gear from the car-axle. The pencil is moved by clock-work. The result, wWythe's speed-recorder for railway-trains, July 28, 1874. The chart is ruled with cross-lines, for distance and time respectively. It is moved by gear from the car-axle. The pencil is moved by clock-work. The result, when the car is moving, is a diagonal line, whose angle will depend upon the speed; the pencil always moves in its own proper direction at the same speed, and the paper slips beneath it at a rate corresponding to that of the car. Brown's revolution indicator, September 1, 1874, has a mercury reservoir and a communicating pipe, which proceeds radially and then bends upwardly. As the device is revolved by the machinery, the mercury obeys the centrifugal impulse, and passing outwardly and up in