Monthly Abstract Bulletin from the Kodak Research Laboratories, Volumes 6-7

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Kodak Research Laboratories., 1920 - Photography
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Page 246 - THE axial photographic transmission coefficient of a lens system for a given set of conditions will here be defined as the ratio of the light flux of photographic quality in the image of a small object on the axis of the system to the light flux of photographic quality that would reach the image were there no losses of any kind in transmission through the system other conditions remaining the same. The method employed in...
Page 114 - Class B includes the screens which are intermediate between the extremes represented by classes A and C.
Page 114 - ... of the resolving power of a photographic plate with the sharpness and the grain size. As an illustration, physical development of a Seed 23 plate gives images with one-fifth the sharpness obtained by chemical development, yet the grains were so much smaller that the resolving power was 20% more. The theory also explains observed variations with time of development and with wave-length, the effect of intensification, etc. By taking pains to secure fine grains, the resolving power of a wet collodion...
Page 246 - F-number of the lens. Because of inherent irregularities in the photographic plate quite a number of exposures must be made in order to arrive at a good average value of the transmission coefficient. The preliminary results obtained have been found to be in good general agreement with those found by visual methods1 as well as with values deduced from the theory of reflection and absorption.
Page 3 - Journal of the Physical and Chemical Society of Russia. Journal of the Society of Chemical Industry.
Page 371 - THE problem of ascertaining the exact extent to which it is possible by the photographic process to produce a pictorial representation of an object which will, when viewed, excite in the mind of the observer the same subjective impression as that produced by the image formed on the retina when the object itself is observed has engaged the attention of workers in the field of photography for many years. There are many phases of the subject to be considered, and a complete treatment requires a careful...
Page 321 - ... separation of magnesium from these metals. " The method depends on the progressive precipitation of the sodium and potassium chlorids from a concentrated aqueous solution by the use of alcohol and ether and Is divided into two stages, (1) in which all but a few milligrams are praMpltated, and (2) in which the last few milligrams are removed from solution.
Page 380 - ... experiments of this nature important differences develop depending on whether the exposures are normal or overexposed. The contradictory results obtained by various investigators are thus explained. If the behavior is investigated by means of overexposure. strong repulsions of neighboring images are found except in the case of absorption lines in which a strong attraction is found. In the case of normal exposure, which is of most interest in general, an attraction is usually obtained amounting...
Page 207 - ... relation between size of grain and percentage made reducible after a certain exposure. The first type of curve is comparable with the characteristic curve; the second gives the relation of light sensitiveness to size of grain.

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