摘要:

The mean heat capacity of bismuth over 10° intervals has been determined from − 80° to 120 °C. by means of adiabatic electrical heating in a copper jacket. The maximum deviation of any individual point from a smooth curve is 0.1%, and the error in the absolute values obtained is considered to be not more than 0.1%. No discontinuities or irregularities were found; in fact, the experimental results are represented to within the limits of experimental error by the linear equation:wheretis the Centigrade temperature, and the units are joules per gram per degree. The equation:was found to fit the mean experimental curve as closely as the graph could be read (0.02%).Tis the absolute temperature andD(119/T) the Debye function for Cvper mole.Cpis given in joules per gram per degree. A calculation ofCpfrom non-thermal data gives values about 3% low.

ISSN:1923-4287    

DOI:10.1139/cjr38a-018

出版商:NRC Research Press    

年代:1938

数据来源: NRC

摘要:

A low frequency dynatron oscillator with a range of 10 to 100 cycles per sec. and a power output of 10 watts is described. The frequency is measured by taking photographs, at intervals of one second, of two pointers on a small synchronous motor powered by the current whose frequency is to be measured. The stability of the oscillations and the accuracy of the frequency measurements are such that frequencies may be maintained and measured to 1 part in 30,000, over a period of several hours.

ISSN:1923-4287    

DOI:10.1139/cjr38a-019

出版商:NRC Research Press    

年代:1938

数据来源: NRC