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A variety of different gases at different pressures have been introduced into a wire form proportional counter and the linearity of response over the entrance studied. It is found that this varies markedly with the nature and pressure of the gas, being very poor for gases which readily form...
A method is described for measuring the velocity of light with a relatively short base line. A Kerr cell modulates a light beam at very high frequencies and a photoelectric cell is used for detection of the modulations. The modulated light beam is divided into two portions by means of a...
Rochelle salt electrometers may be used to advantage where space requirements demand a device of small size. They are useful if they are to operate in a high impedance circuit. They also serve to study conveniently the piezoelectric properties of Rochelle salt.
An alternating current bridge and amplifier for continuous temperature control of furnaces and thermostats is described. The circuit is simple and portable and can be made from standard electrical equipment. The power output of the control circuit is doubled for a change of 0.03 percent in...
A theory is proposed that accounts for the variations in the observed focal spot patterns on the anodes of x‐ray tubes caused by changes in the geometry of the cathode structures. The focusing of electrons emitted by a helical filament within a focal cup can be explained qualitatively by...
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