With the progress of petroleum industry the production of liquified gases such as propane and butane has recently been increasing.
Propane gas has already been used for bright annealing of metals, carburization of steel etc., but butane gas has not been utilized yet in our country.
Butane gas has favorable charactristics, such as uniform composition, high thermal power, easy transportation due to steady liquified form and comparatively safe operation due to narrower explosion limits.
This report deals with the investigation of the composition of generated gas from butane, and of the soot deposition in generating endothermic atmosphere.

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For genarating the controlled atmospheres in heat-treatment of metals, propane gas and charcoal gas is now widely used because of easy availability and simple method of generating. Kerosene and gasoline are also considered as the useful resources for generating furnace atmospheres, because they have various favorable characteristics that they are inexpensive as compared with other fuels that their transportation is easy, and that they can be obtained in the inconvenient districtswhere fuel gases are not secured.
This, report deals with the studies on generating conversion gases from kerosene and gasoline, and controling their compositions for the possible utilization of the atmospheres from them to the bright annealing of metals.

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Application of P. R. Process to the electroplating of some metals has recently been reported occasionally. This paper deals with the investigations on the iron layers electrodeposited by P. R Process applied over the conventional method.
By means of macroscopic and microscopic observasions, current efficiency measurement, and hardness test, as well as observations of annealed structures, the following conclusions are arrived at:
1) The surface of the electrodeposited tends to be smooth.
2) The fibrous structure in the layers electrodeposited by the conventional method tends to be columnar or mesliy.
3) The longer the reversed current, which is anodically and periodically applied on the cathode, is sued, the more remarkable are the tendencies descrived above.
4) The effects on the current efficiency and on the hardness of deposits are not apparently noticeable. Thus the application of P. R. Process seems to be favorable to the electrotyping of iron.

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