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In using either the x-ray or electricity in therapeutics, the inconvenience and loss of time required to time the length of treatment properly is an annoying feature of the work. More especially is this true when the x-ray is used, as the length of exposure is of the utmost importance. The safety of the patient requires great care in order that over-exposure be avoided, and safety to the operator requires that he should not remain present longer than necessary, even when ordinary protection is employed.
I have devised a new automatic time switch which is very simple and positive in operation, and can be depended on to stop the treatment when the time is up by cutting off the current. This not only makes it unnecessary for the physician to be present during the time of treatment, but also relieves the patient from anxiety caused by fear of too long
WAGNER RV. AUTOMATIC TIME SWITCH FOR X-RAY WORK. JAMA. 1908;L(4):280–281. doi:10.1001/jama.1908.25310300032003d
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