In the summer of 1947, Dr. Zimmerman discussed with an engineer the idea of making a time-motion study of hand adjustments. After much planning, high-speed pictures were taken by Three Crown Productions under the direction of two engineers. 'Analysis of "Specific Adjustments"', was the resulting twenty-seven page report to determine exactly what Dr. Zimmerman was doing, by hand, in making adjustments on the atlas (or axis) vertebra.
This study was an exhaustive investigation into what happened when an adjustment was made by hand. High-speed motion pictures were made of patients being adjusted by hand. In the first high-speed film sequence, Dr. Zimmerman's hands, the patient's neck, a stop watch and depth gauge were in view. This facilitated exact measurements of time, speed and motion of the hand adjustments on the patient's neck. Six such sequences were run on different patients. Some with thin necks, some with thick necks, some male, some female.
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