By changing the air pressure, the force used can be varied at will. By raising or lowering the collar on the drive pin, the depth of the thrust can be varied from 1 inch to zero. The adjusting head is mounted on a ball and socket joint permitting changes in the angle of drive over a wide range of positions.
In May, 1948, the machine was completed, preliminary tests were made and all functions were found to be satisfactory. The base of the adjusting machine was made purposely so that the side-posture adjusting table would fit into it and become an integral part of it. The machine was installed in the office on June 6, 1948. On June 10, 1948, a woman who was a long established patient was asked if she would like to be the first patient to be adjusted by the machine. She agreed and the same adjustment was made by machine on the atlas vertebra as had been made previously by hand. The patient's reaction was very enthusiastic. She said that she had experienced less discomfort than by hand.
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