Abstract
In the previous report, an approximate formula giving the transient temperature variation in a circular cylinder of finite length, since the immersion of its lower end part to a high temperature bath, was deduced analytically. Now, its result is compared with the experiment. For this purpose, a special experimental method is used. One of its speciality is the direct observability of the shape and growth of the isothermal line in the cylinder. And the other, the isothermal lines thus obtained are free from the disturbances which will be aroused, if many thermocouple wires were inserted into the cylinder. A specimen is composed of two semicircular cylinders of glass, and one joinning plane (neutral layer) is painted in the thermo-colour. Then, a boundary between changed and unchanged colour region represents itself an isothermal line. Since the instance of immersion of the specimen into a bath, isothermal lines are observed from time to time. Comparing the group of isothermal lines thus obtained with the corresponding lines calculated, very good agreement is recognized.
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