A series of gelatin color filters has been made and colorimetric specifications are given for each of the series including the trichromatic coefficients and Iuminous transmittance for ICI illuminants A and C.
The computations of trichromatic coefficients of each filters have been made by weighted-ordinate method in 10μ, a. intervals.

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In the color photography a favorable color reproduction can be obtained when the spectral energy distribution of illuminants coincides with the balance of each sensitivity of three layers of the color film.
The spectral characteristics of the color correction filter (viz. conversion filter) should theoretically be the one which convert the spectral energy distribution of the illuminant used in the photographing into that of the illuminant fit closely for the color film.
Now on the basis of 6000°K of daylight energy distribution for the daylight type and 3100°K of black body radiations spectral energy distribution for tungsten type film, we sought the theoretical transmission curves to convert the spectral energy distribution likely to be required for the actual photographing into 6000°K and 3100°K.
Meanwhile, the necessary characteristics of color correction filter also can be expressed as the ones which covert the ratio of effective amount of light to each layer of the multilayered color film.
For this reason, the calculation for the characteristics of the filters was made in aiming at that the filters have characteristics of the filters to convert the effective amount of light to each emulsion sensitive to blue, green and red, after calculation of the spectrum in imagination the spectral sensitivity curves of each layer of the film.

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A visual transmission densitometer has been designed and built. The density range of measurement by this densitometer is 0-3.0. As the light source one tungsten filament incandscent lamp has used, and the light from the lamp has been devided by a clear glass into two light beems at right angle. One of the two beams illuminates the specimen after passing the standard density wedge and a opal glass, and the other illuminates a half of a bi-prism. Over all measuring range, the brightness of viewing field has been kept at a constant brightness level.

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For reflection density measurement of photographic papers, a visual reflection densitometer, type KD-2, has been designed and built. In order to attain the precise color match of the two halves of photometoric fields, a single exciter type incandscent lamp has been used as a light source. The density range of measurement is 0-3.0.

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An intensity scale photographic sensitometer, type KS-2, at tong exposure time levels, has been designed and built. The possible exposure times by this sensitometer are 1/10-10 seconds on automatic operations. For exposure times, longer than 10 sec., a time switch has been prepared. The shutter is a focal plane type and made of two metal plates drived by a weight and control-led by electromagnetic mechanisms. As the time standard, a rotating wheete which is drived by a constant speed synchronous motor has been used. The size of test films is 48×120mm.

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Nine kinds of 1-pyenyl-2-sulfonamino-5-pyrazolone derivatives were prepared by sulfonylation of 1- phenyl-3-amino-5-pyrazolone with aryl or heterocyclic sulfonyl chlorides.
These 3-sulfonamino pyrazolone coupler will couple very rapidly with the oxydation product of p-amino-diethyl aniline and give dyes having good light absorption charactoristic and good transparency.

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