Word: oscillograph
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Dates: during 1940-1949
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...general, their experiments sent small electrical impulses along isolated nerve strands (from frogs, etc..) and recorded the speed and volume of fiber responses. As the amounts of electricity involved were very small, the doctors devised a way of recording the impulses, using a cathode ray oscillograph (rays from a vacuum tube oscillated by an electrical or magnetic field) which made wavy lines on photographic paper...
...Plato Schwartz and Harry Bou-man at the University of Rochester (N.Y.) used an oscillograph (electrical impulse recorder) to test the muscles of infantile-paralysis patients. They found that while it is true that the contracted muscles are in spasm, the stretched muscles and other muscles all over the body are also in spasm, but to a lesser degree. In the stretched muscles they found both paralysis and spasm. They conclude: 1) the muscle weakness results from impairment or destruction of certain nerve cells in the spinal cord; 2) spasm, which is only temporary, results from lack of the nerve...
Robert S. Schwab, for Brain Wave Laboratory, Harvard Medical School and Massachusetts General Hospital, for the purchase and construction of a suitable cathode ray oscillograph apparatus with one built-in head amplifier and power amplifier projecting on a 4-inch screen and accompanied with a suitable camera with four different speeds of operation, using a standard 35 millimeter negative film...