Applied Motion Study
A Collection Method to industrial Preparedness

MOTION MODELS 115 that it did not enable us to visualise clearly the path taken by the motions and the elements of the motions.1 Our next step was to attach a miniature electric light to the hand of the worker; to photograph the worker, while performing the operation being studied, and thus to obtain the motion path under actual working conditions. »Through the use of an interrupter in the light circuit we obtained the photography of time in a single exposure. Later, through a time con- trolled interrupter, we obtained photographs of exact even periods of elapsed time of any desired duration. Through the use of a special arrange- ment we obtained time spots that were arrow- shaped that gave us the invention of the photog- raphy of direction. Through the use of the pen- etrating screen we obtained exact distance, and thus exact speed, of motions. Finally through the use of the chronocyclegraph method, which is a combination of these various devices, we ob- tained a satisfactory record of a motion path, showing relative time, exact time, relative speed, exact speed, and direction of all motions in three i See works of Muybridge, Marey, Amar. See “ Concrete System,” Engineering News, New York.