Society of Motion Picture Engineers : incorporation and by-laws (1927)

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A Sensitometer Tablet — Ives and CraUree 749 appreciable when the emulsion used contains a yellow dye such as is present in the Duplicating Film. With ordinary positive film, the change in image contrast resulting from printing with a high wattage lamp at low voltage (yellowish light) and at higher voltage (violet light) is of Httle or no moment in practice with regular positive film. It should be remembered that since the various densities of the tablet are neutral in color and therefore non-selective, they transmit light of all colors in the same proportion. The tablet should, of course, be adjusted to the printer with a given lamp. A tablet which works with a 60-watt lamp will not work at all with a printer fitted with a 200-watt lamp when the same rheostatic control is used in both cases. Mr. Emslie : Would this work successfully with the Duplicating Film? Mr. Crabtree: It would work with any stock. Duplicating Film is slower than regular positive film, so that a stronger lamp or longer exposure would be needed.