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The coercive force of magnetite powder is increased by mere mechanical grinding. Measurements on sized powders of one natural and one artificial magnetite give a linear relation between coercive force and mean specific surface of the grains. It is suggested that this relation between coercive...
Observations by Schonland and Collens with Boys' camera show that the luminous tip of the leader stroke of the lightning discharge advances with a high velocity sometimes exceeding 3×10 9 cm per second. From the fact that electrons traveling 10 9 cm per second produce about 6000 new electrons...
The expression for the temperature distribution in a semi‐infinite bar with heat supplied to the surface x =0 at a rate given by H = kt n ( n =0, 1, 2 ⋅⋅⋅) is derived, assuming no radiation to the surrounding medium and an initial temperature of zero. Curves are given which enable the...
This paper presents the results of investigations of dissipation of energy in vibrating solids, mostly metals, by means of longitudinal and torsional vibrations of cylindrical rods. The amplitudes of strain used have been kept between 10 −5 cm/cm and 10 −8 cm/cm, in which range the...
A method is given for obtaining a power series expansion in the wavelength for the Rayleigh wave velocity in a half‐space whose density ρ and elastic constants λ and μ are functions of depth. This is followed by a discussion of the Rayleigh wave problem in media where λ = μ and μ( z ) and...
The telegraphist's or long line equations are derived from the Maxwell field equations for ultra‐high frequencies. By taking into account retardation and the time rate of change of current, a new circuit parameter is obtained in addition to the four usually found in the conventional low...
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