Abstract
In the majority of researches hitherto carried out for hardening liquid, the specimen was hardened in the liquid. and its cooling state was investigated by means of the cooling curve, etc. In the present research, however, the observation was directed to the liquid, and the condition of ejecting hot current of the liquid and that of the convection were photographed by Schrieren's Method, the results of the preparatory experiments having been published in the Journal of the Society of Mechanical Engineers, Japan in the names of Mr. Tachibana and the author. In the present paper, the results of research on the state of hot current at the instant of hardening, and the relation between the surface temperature of the specimen and the heat quantity lost in unit time, etc, are dealt with.
