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Sun-Lamp for Emulsion Calibration

Volume 7, Number 1 (Feb. 1953) Page 20-24

Mitteldorf, Arthur J.


Although spectrographers can readily calibrate photographic emulsions for their own particular instrumentation, when reproduced elsewhere, the "exact" conditions often yield dissimilar results. The reason for this is in the quotation marks: it is not possible to reproduce conditions from one laboratory to another. There are uncontrollable variables in every source, in every photographic plate, in every spectrograph. This article proposes the use of a controlled excitation source to minimize one of these variables. In addition, data are given which show the potential usefulness of the source for comparing the spectral response (speed) of spectrographs, and for evaluating emulsions.