12 ART. 11. T. YAMAMOTO : THE FUSION CURVES 



The inner tube, in which the mixtnre was placed, was a 

 large test-tube of about 150 c.c. capacity, being some 20 cm. in 

 length and about 3 cm. in internal diameter. The outer tube, 

 which served as the air chamber was considerably wider. The 

 tubes did not emerge much above the cover of the outer vessel, 

 and the cork was deeply inserted into the inner tube. The 

 exposed parts were covered with cotton wool, in order to prevent 

 the loss of heat by radiation. In this way every part of the 

 inner space of the tube was kept at a temperature not much 

 below that of the bath, and the danger of sublimation of the 

 naphthalene was minimised. This evil could not be entirely 

 avoided, but the quantity which sublimed to the upper part 

 of the tube was so small, that no serious error could arise from 

 this source. 



To make a series of observations on the fusion curve of 

 naphthalene, about 20 grammes of this substance was placed in 

 the tube, and phenol was added in successive portions, the fusion 

 point being determined after each addition. The mixture was 

 carefully melted by direct application of heat, and then allowed 

 to cool down in the air chamber. For the determination of the 

 fusion curve of phenol about 34 grammes of this component was 

 taken, and naphthalene was added in portions. 



For the measurement of temperature two Anschutz thermo- 

 meters graduated in 0.2° were employed. One of them had 

 the range of 0°-60°, and the other 50°-100°. They were cali- 

 brated by comparison at various temperatures with a normal 

 thermometer standarised at the Keichsanstalt. As the thermo- 

 meter for higher temperature showed considerable secular change, 

 the determination of certain fixed points was repeated from time 

 to time. The reading was done through a telescope, and was 



