Tim′ing-appa-ra′tus.
（Railway.) An apparatus for automatically recording the rate of speed of railway-trains. An endless screw on the axle of a car through the medium of a worm-wheel and connecting-rods causes a pencil-point to traverse back and forth across a strip of paper winding over a drum moved by clock-work. The paper is ruled with transverse lines corresponding to minutes, and the rate of speed is indicated by the number of lines which the pencil-mark crosses during its passage from one side of the strip to the other. Thus at the rate of 15 miles an hour, the diagonal pencil-line will cross four of the ruled lines; at 20 miles, three; and so on. When the train is stopped, the pencil-mark will be directly across the paper, parallel to the ruled lines. See speed-regis-ter; speed-recorder; etc.
