Journal of the Society of Motion Picture Engineers (1930-1949)

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1949 C-R-TuBE APPLICATIONS 73 (a) On Cartesian co-ordinates. (b) In polar co-ordinates. Fig. 6 — Light distribution from small flashlight bulb. to the logarithm of the exposure. These curves are generally produced by exposing either a stepped or continuously graded logarithmic variation of exposure along a strip of film, which is then processed in the usual manner. The dry film is examined by means of a densitomiter and the results plotted on graph paper. This procedure is luite laborious and time-consuming. The shape of the H and D