Abstract
In pursuit of information concerning the nature of lubrication in gears, measurements of the electrical resistance between the meshing teeth of rotating gears have been made using a cathode-ray oscillograph. Photographs of the trace on the screen of the cathode-ray oscillograph are shown indicating values of resistance ranging from infinity to zero. The variation of resistance depends on the load, though the resistance is always lowest where the sliding speed is highest and has its maximum value in the neighbourhood of the pitch-line where there is no sliding motion. Absolute values of film-thickness could not be determined.

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