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A special type of echelette grating for wavelength measurements of ultra‐short electromagnetic waves is described. The one grating may be used over the entire wavelength range from 1 to 10 cm without loss of effectiveness due to an automatically changing groove form which keeps the direction of...
The dependence of the velocity of sound on gas temtemperatures is utilized to determine the temperature of the copper arc in air at atmospheric pressure. The sound ``wave'' produced from a condensed spark discharge in air is passed through the stabilized arc column and received by a second spark...
The movement of ferromagnetic particles in various types of alternating magnetic fields and the mechanisms involved are discussed. The conditions under which demagnetization takes place in magnetic fields produced by damped high frequency oscillatory discharges are described, and possible...
The photoelastic effect in amorphous solids is caused by two effects. The elastic deformations alter the Lorentz‐Lorenz interaction between the dipoles, and in addition produce optical anisotropy of the atoms. For pressure the first effect creates positive birefringence, while the second effect...
The photoelectric emission from a platinum filament coated with thorium oxide seems to be due chiefly to that part of the spectrum lying between 2500A and 3100A. An increase in the photoelectric emission from the thorium‐oxide‐coated platinum filament was observed with increasing temperature...
Experimentally determined values of the velocity c of sound in atmospheric pressure arcs in air are interpreted in terms of the temperature of the gas. The velocity may be expressed in general in the form: c = ( ( R T ∕ M ) ( 1 + R ∕ C v ) ) 1 2 , which applies to pure gases or mixtures of...
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