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Lantern Slides

Nature volume 145, page 145 (27 January 1940) | Download Citation



THE cost of making lantern slides from illustrations may be materially reduced by using paper negatives, and Mr. G. H. Bell, of the Physiological Institute, Glasgow, gives an account in the December issue of the Journal of Scientific Instruments of a method he has found very satisfactory. He uses “Kodaline Paper Slow” exposed for three minutes at f/11, the illustration being illuminated by four 100-watt lamps placed just behind the camera lens. He develops with Kodaline developer and gets a pure black and white negative. He prints on gas-light lantern plates using a mask and giving an exposure of 8 seconds for a surface intensity of 65 foot-candles, uses an energetic developer and gets a slide with black lines on a perfectly clear background both for line diagrams and half-tone illustrations.

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