A mathematical analysis has been made of the effects on the effective intensity* I e , computed from the Blondel and Rey relation a + t 2 ti produced by changes in the limits of the integral. The maximum value of I is obtained when the times t^and t 2 are the times when the instantaneous 6 intensity, I, is equal to I e# Methods which facilitate the computation of I , the checking of conformance to effective intensity specifications, and the computation of visual range of flashing lights are given.
This report describes a calibrator developed for use in adjusting the transmlssometer. The results of field tests of the instrument and operating, instructions are included. With the calibrator, used carefully, the expected error in the setting of the transmlssometer is approximately P. 015 when the transmittance over the transmlssometer baseline is 0.90 or greater. 1.
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