Applied Motion Study
A Collection Method to industrial Preparedness

86 APPLIED MOTION STUDY With the study of the chronocyclegraph data has come the invention of the penetrating screen, which makes it easier to visualise and to meas- ure the elements of the cycle being studied. It was desired to visualise simultaneously the time and space occupied by the motion. As is so often the case, invention was here held back by a belief. In this case it was, “Two objects cannot occupy the same space at the same time.” It took years to realise that, while this is usually true, a photo- graph can show them as occupying the space at the same time. This multiple exposure method made it possible to place a cross-sectioned screen in any place, or number of places, in the picture. A screen may be placed in the plane in which the worker is performing his chief activity, before the worker, or back of him. The worker may be enclosed in a three, four, five, or six-sided box. The screen may be set at any angle. In short, a cross-sectioned screen of known dimensions can be introduced at any place where it will enable one to secure a more accurate record of the mo- tion. This is done by the simplest and most in- expensive means. Take a sheet of black paper of the size of the space to be photographed, and