IT is well known that the more sensitive a photographic plate is, the greater the care that has to be taken with respect to the actinic value of the light used in the dark room during the operation of ...
IN the September number of the Astrophysical Journal Mr. R. J. Wallace gives an account of his investigation of the circumstances that control the size of the silver particles in a developed ...
If you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in ...
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