A review on the progress in photography in the year of 1959; about cameras, lenses and camera accessories, sensitive materials, theory of photographic sensitivity, development and fixing, enlarging and slide projecting, cinematography, scientific photography and color photography.

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The condensation product of 5-amino-s-triazole and ethyl acetoacetate, assumed to be 5-methyl-7-hydroxy-s-triazolo [2, 3-a] pyrimidine, is known to be an excellent photographic stabilizer.
The structure of this substance was elucidated by condensation of 2-hydrazino-4-hydroxy-6-methylpyrimidine and formic acid from which two kinds of new substances were obtained besides the above product. Examinations were made on the reaction of these three kinds of products with silver ion and the behavior of the emulsion when these substances were added. These condensation products were all proved to have excellent stabilizing activity on photographic emulsion.

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Authors applied different kinds of the chemical sensitization on a test emulsion of the neutral type. The sensitized emulsions were exposed to light and β-rays. The kinds of sensitization are; sulphur sensitization with allylthiourea, reduction sensitization with stannous chloride, gold sensitization, sensitization with triethanolamine and sensitization with lead nitrate. The manners of sensitization were more or less different from one kind to another. The sulphur sensitization gave the biggest effect either to light or to β-ray exposition. In this case the effect of 2nd ripening time was smaller to β-ray than to light. The reduction sensitization was, effective in the 2nd place and the effect of 2nd ripening was greater even to β-ray exposition. Gold sensitization with Köpff gelatin was greater than that with Nippi gelatin used in the experiment. The sensitization with lead nitrate was quite different from other types of sensitization. The light sensitivity decreased much with the addition of lead nitrate while the sensitivity to β-ray was great.

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A new and rapid method for the determination of 1-phenyl-3pyrazolidone in used developers requiring only a small quantity of sample solution is based on the extraction of the 1-phenyl-3-pyrazolidone with chloroform in acid media and on the measurement of absorbancies in UV or IR region.
The time required for the determination is 15-20 min.(UV) or 10 min.(IR).
Of the two, the UV method is the mor eaccurate, the error being ±0.01g in determining 0.5g of 1-phenyl-3-pyrazolidone per litre.
The IR method is advantageous in the circumstances where the presence in the extract of oxidation products of the developing agent and/or sulphur dioxide interferes with the determination by the UV method; in the IR region, their absorption bands apear separated from that of 1-phenyl-3-pyrazolidone and hence cause no trouble.

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In the 1st. development on the coupler-in-emulsion typereversal color films, we can reduce its developing time by using “Amidol”. It is 3 minutes in 30°C in spite of standard time is 15 minutes in 20°C.
We investigate the effect on the color balance in the stop bath while the rapid processing. This bath must be processed to stop a faculty of the developer as fast as possible.
Through the whole processing, the film must be treated with care of a swelling of emulsion. Accordingly, 2 nd. exposure should be processed by fluoresence lamp that is less heat radiation.

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The observation of developed silver grains by electro-micrography is often utilized as one of the researchtechniques for various studies about photographic science.
But we can not find yet the systematic study, that will be able to decide the various different conditions which were produced numerous shape of developed silver greins by the assortment and arrangement of the electro-micrographs of these developed silver grains, produced from various type of emulsions by various type of developers.
So. w c: have undertakened to the studies which mentioned above.
At first step of this study, we have tried to record the shape of silver grains of Fuji NeoPan dry plate emulsions, which is very popular materials in Japan, by Electro- Microscope. Eight sort of samples, which were produced by eight sort of developers made of eight different type of developing agents, were used for this experiment.
On this report, we will show these Electro- Micrographs and will explain how different shape of developed silver grains were produced by various type of developing agents from the same emulsion.

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