Читать книгу A Practical Manual of the Collodion Process. Giving in Detail a Method For Producing Positive and Negative Pictures on Glass and Paper онлайн

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COLORING WALLS BLUE.

(Blue paper and blue color have been somewhat extensively used by our operators in their operating rooms and skylights, in order to facilitate the operation in the camera. I fancy, however, that this plan cannot be productive of as much good as thought by some, from the fact, that the light falling upon the subject, and then reflected into the camera, is, coming through colorless glass, not affected by such rays as may be reflected from the walls of the operating room; and even if it were so, I conceive that it would be injurious, by destroying the harmony of Shadows which might otherwise occur.) The greatest amount of white light is at C; the yellow contains less of the chemical power than any Other portion of the solar Spectrum. It has been found that the most intense heat is at the Extreme Red, b.

Artificial lights differ in their color; the white light of turning charcoal, which is the principal light from candles, oil and gas, contains three fays—red, yellow and blue. The dazzling light emitted from lime intensely heated, known as the Drummond light, gives the color of the prism almost as bright as the solar spectrum.