Abstract

A new intensity-scale sensitometer capable of producing a top maximum exposure of about 100 meter-candle-seconds in 1/50 second has been designed and built. The instrument exposes twenty steps, one step at a time. The individual steps are the same size as those produced by the IIb instrument. Every effort has been made to make this sensitometer reproducible to specifications and free from variability with age and use. Instead of the absorbing step tablet ordinarily found in high intensity instruments of the variable-intensity type, this sensitometer produces its exposure series by the interposition of metal diaphragms in an optical system. The size of these diaphragms was determined by computation and the results have been checked experimentally.

© 1942 Optical Society of America

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