On the Action of Wood on a Photographic Plate in the Dark. . solutions. Threedouble-cased bell jars were taken, one was charged with a solution ofpotassium bichromate, another with copper ammonium sulphate solution,and the third with pure water, and all were exposed to sunlight for4 hours. The deal in the red light gave only,a faint picture, that inthe blue light a dark picture, and that with the pure water was only aslightly darker picture. Resin, guiacum, copal varnish, white oil paintand resin sized paper all acted in the same way and gave similarresults. The light from an arc lamp when pas
On the Action of Wood on a Photographic Plate in the Dark. . solutions. Threedouble-cased bell jars were taken, one was charged with a solution ofpotassium bichromate, another with copper ammonium sulphate solution,and the third with pure water, and all were exposed to sunlight for4 hours. The deal in the red light gave only,a faint picture, that inthe blue light a dark picture, and that with the pure water was only aslightly darker picture. Resin, guiacum, copal varnish, white oil paintand resin sized paper all acted in the same way and gave similarresults. The light from an arc lamp when passed through a red glass andallowed to fall on a wood section for 1J hours produced no effect, butwhen the same light was passed through a blue glass and fell on asimilar wood section for only 1 hour it produced a dark picture. Withliquids this same increase of activity by the action of blue light isproduced. Turpentine, which has been exposed to blue light, is moreactive than when in its ordinary condition. RusaelL Roy. Soc. Proc, vol. 74, Plate 7. FlG, Fig.
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Keywords: ., bookauthorrussellw, bookcentury1900, bookdecade1900, bookyear1904
