Cossor Oscillograph model 1049, with camera model 1428, by A. C. Cossor Ltd., London, used in EEG work at Hurstwood Park Hospital, 1939-1960.

An oscillograph is used to measure electrical changes that go up and down again (oscillations) and produce a graph of those changes. This example is fitted with a camera so photographs could be taken of the graphs. This example was used in EEG (electroencephalography) At Hurstwood Park Hospital. An electroencephalogram or EEG is a recording of electrical signals within the brain. This example was used at Hurstwood Park Hospital. The hospital became a pioneering centre for neurosurgery during the Second World War.