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In October, 1904, I devised, for the Hospital of the Good Samaritan, a signal system for calling nurses to patients, which has the following advantages:
Noiseless. There being no bells, the call is absolutely silent.
Monitor board. This is in the office of the superintendent of nurses and enables this officer or her representatives to observe each call for the entire institution, thus making it possible to see at a glance the number of patients desiring the services of a nurse and the length of time elapsing before such call is answered.
Lights in the corridors. These are placed above the door of each patient's room, making it possible for the nurse, if she happens to be in the vicinity, to observe and answer the call without having to go to the indicator in the nurse's room.
Lights in the rooms. These are placed in such a manner that they may
PAHL PCH. A HOSPITAL SIGNAL SYSTEM.. JAMA. 1907;XLVIII(17):1431-1432. doi:10.1001/jama.1907.25220430043002c