1963 年 83 巻 4 号 p. 410-412
A convenient apparatus for precise determination of melting point was devised, using the m. p. tube of J, P. VII. (m. p. tube for visual thermal analysis adopted by Reinboldt) Through the left side arm, a thin glass tube is inserted into the bath liquid. The cork stopper supports two thermometers, one of which serves for temperature correction, and a glass tube which is connected to a water aspirator by polyvinylchloride tubing. A m. p. capillary is set through the right arm and by gentle suction, air bubbles come from the left one and stirr the liquid completely. Thus the temperature of the bath becomes uniform throughout. By this simple apparatus, rapid and accurate determination of melting point (<±0.2°) can be easily made and the danger of inhaling harmful vapor from the bath liquid is completely avoided. This is also very useful for the thermal analysis of two-component system of organic compounds. Some data of comparison between this apparatus and the original J. P. VII type were shown.