摘要:

The spectrum of cerium has been photographed from λ3600 to λ500 Å by means of a two-meter grating of 30,000 lines per inch mounted in a vacuum spectrograph, using the vacuum spark and the spark in nitrogen as sources. An analysis of the spectrum of Ce IV results in the location of the 6S − 6P, 6P − 6D, 6P − 7S, 5D − 6P, 6P − 8S and possibly the 6P − 7D multiplets. The ionization potential is approximately 33.3 volts.

ISSN:1923-4287    

DOI:10.1139/cjr35a-001

出版商:NRC Research Press    

年代:1935

数据来源: NRC

摘要:

Campbell's a-c. bridge for the measurement of self-inductance in terms of mutual inductance can be modified so as to measure small capacities (1–1000 μμf.). The arrangement described is sensitive to within 0.01 μμf. Small condensers can be measured to within 1% with ease. Residual errors are discussed.

ISSN:1923-4287    

DOI:10.1139/cjr35a-002

出版商:NRC Research Press    

年代:1935

数据来源: NRC

摘要:

The deviation of the overtones from whole multiples of the fundamental note when pure longitudinal waves are set up in a cylindrical rod, one to a few centimetres in thickness, is accounted for to within less than 1% by the drop in the velocity of propagation of longitudinal waves with increasing frequency due to radial motion in the rod. The radial component present in vibrating solid or hollow cylinders determines a second solution of the velocity equation which starts near the resonance frequency of the radial vibration. Although radial motion can take place free from longitudinal components, so that no mutual coupling need exist between the two types of vibration, the equation for thin rods can within certain frequency ranges be reduced to the frequency relations valid for coupled systems.

ISSN:1923-4287    

DOI:10.1139/cjr35a-003

出版商:NRC Research Press    

年代:1935

数据来源: NRC

摘要:

The results of measurements on the thermal conductivity of acetylene black, rock wool, sphagnum moss, dried asbestos–water paste and other insulators are given.

ISSN:1923-4287    

DOI:10.1139/cjr35a-004

出版商:NRC Research Press    

年代:1935

数据来源: NRC