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Rudge & Co., of Coventry, represented in the cut. Photo. News. A printing frame is placed in the carrier, and exposed to the light of a gas burner kept at a fixed distance, behind which is a spherical reflector. The same frame may be used for other purposes.-Photographic News. A selenium actinometer has been described in the Comptes Rendus in a communication from M. Morize, of Rio de Janeiro.
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