Applied Motion Study
A Collection Method to industrial Preparedness

68 APPLIED MOTION STUDY path of the motion in all three dimensions; that is, length, breadth, and depth. It did not, how- ever, contain the time element. This time ele- ment is of great importance not only for compara- tive or “ relative” time, but also for exact times. This time element is obtained by putting an in- terrupter in the light circuit, that causes the light to flash at an even rate at a known number of times per second. This gives a line of time spots in the picture instead of a continuous cyclegraph light line. Counting the light spots tells the time consumed. The next step was to show the direction of the motions. To do this it was necessary to find the right combination of volts and amperes for the light circuit and the thickness of filament for the lamp, to cause quick lighting and slow extin- guishing of the lamp. This right combination makes the light spots pointed on their latest, or forward, ends. The points, thus, like the usual symbol of arrow heads, show the direction. The result was, then, of course, finally, stereochrono- cyclegraphs showing direction. These act not only as accurate records of the motions and times, but also serve as admirable teaching devices.