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Flexural waves. A seismograph, used to study propagation of explosion‐generated waves in a sheet of ice on a lake, revealed the existence of flexural waves. These waves showed marked dispersion, the group velocity being represented approximately by the empirical formula U =221( en ) ☒ , where...
A single spring vertical motion seismograph of theoretically infinite period is described. Actual periods of over a minute have been obtained with a seismograph of this type while for a period of 37 seconds the period was found to be constant to within 1 second for a variation of 9° in the angle...
Solutions of the generalized equations of the variable Mu triode exp ( p v ) = ∫ v ∞ ( v + z ) k F ( z ) ( d x ∕ d z ) d z ( v + z 0 ) n = ∫ v z 0 ( v + z ) k F ( z ) ( d x ∕ d z ) d z for dx/dz are given by means of the gamma‐function. Here z is the reciprocal of the amplification...
An investigation of an alternating‐current bridge method of measuring critical potentials in a vapor has been made. The tube containing mercury vapor and of similar structure to that used in the experiments of Franck and Hertz was placed in one arm of an impedance bridge and so arranged that a...
Very high maximum magnetic permeability has been obtained in certain ferromagnetic alloys by slowly cooling them in a magnetic field. In permalloy with 78.5 percent nickel it has thus been raised above 140,000 that is, to the same order as is obtainable by rapid cooling without an applied field....
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