Applied Motion Study
A Collection Method to industrial Preparedness

84 APPLIED MOTION STUDY of motions to be thus recorded, and the method was called the “ cyclegraph method of motion study.” A study of cyclegraphs shows a need for an indication of time, and, while the path of the motions is apparent, the time of the motions is not shown by the plain cyclegraph. This time element is of great importance, not only for se- curing records of comparative or relative time, but also for securing records of exact time. The time element was eventually obtained by placing an interrupter in the current, that transformed the white line of the cyclegraph into a series or line of dots and dashes. This made of the cycle- graph a chronocyclegraph. The exact time is se- cured by using a tuning fork vibrating a known number of times per second as an interrupter. The record now becomes a series of timed spots, and the method becomes the “ chronocyclegraph method.” Through intensive study of the ap- paratus, it has become possible to devise differ- entiated time and speed spots, and thus to dis- tinguish various motion paths in the same stereo- graph (see Fig. 12). This means that we can now attach any desired number of lights to differ- ent working members of the worker’s body, and