Calibration of liquid density meters
Calibration of liquid density meters is discussed. The major portion of this paper deals with the proving of liquid density meters at line conditions using a pressurized pycnometer. This method has become an industry standard for proving liquid densitometers at line conditions. The author suggests that the pycnometer method of proving on-line densitometers is a very accurate field method of calibration, and that through the use of good measuring and testing equipment and proper procedures, accurate density measurement can be assured.
Bolometers operating at low temperature are discussed as detectors of heavy particles which have been recently considered as constituents of Cosmic Dark Matter. The study of the heat leak in a cascade refrigerator operating underground is suggested for the indirect detection of Weak Interacting Massive Particles.