Long and extensive studies on the subject matter by applying the cast iron electric arc welding rods have been successively achieved by the writers while they are working in the foundry plant of an automobile vehicles and an engine manufacturing factory.
  In view of the fact that there are very few domestic records available in this line, this report is published to fill the requirement of those who are dealing the same problem.
  The report is on the repair work of a big machine tool which was bombed and cracked during the war and repaired by using the cast iron electric arc welding rods.
  The briefing of the conclusions reported in this articles are as follows :
  (1) Electric arc welding rods are applicable to the repair work on the defects of big gray iron castings.
  (2) Cast iron electric arc welding rod can be adopted into the welding of massive iron castings.
  (3) Further study in this line is strongly encouraged as it has been generally neglected because of its complicated appearances.

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  In The “Mechanized Continuous Equipment of Foundry” for mass production of small castings, it is most important to save labour as well as to demonstrate high moulding efficiency.
  So it is not too much to say that if we fail in ataining these objects, the establishment of the equipment is meaningless.
  But in most cases, equipments of the usual type have many defects in these respects and don't produce so satisfactory results as appearance.
  The cause is the low grade of essential rationality for the equipment details.
  In manufacturing this newest type equipment, we organized the committee for the study of improving these defects of manufacturing the high efficiency equipment and for the investigation of studies of the past years based upon our experience.
  At last, we completed the creative equipment having high rationality, obtained the excellent result and could accomplish our expectation.

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  Pig iron in the market, being added steel scrap, was melted in a graphite crusible and added 0.4 to 1.0% CaCN₂ (grain finessess <3mm) at 1400 to 1450°C.
  When the total content of nytrogen beomes about 0.02 per cent, the tensile strength always increases 5∼8 kg/mm² as compared with one without adding Ca CN₂.
  The strength was lowered according to increase of carbon and silicon and increased by manganese. The hardness increased about 10 B. N. H. by Ca CN₂ and this can be prevented by the inoculation of silicon. (M. I.)

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  Nine experimental heats on a small cupola with a acid or basic lining were used to compare with metal and slag chemistry, and to estimate the possibilities of nodular cast iron production.
  (1) When the basicity of slag is from 2.5 to 3.0, molten metal of about 4 per cent carbon and 0.01 per cent sulphur content is easily obtained directly from a cupola.
  (2) The possibility of the nodular iron production is extremely influenced by the quality and heredity of charge metal even if the basic cupola practice carried out.

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