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The slipperiness of graphite is not inherent in the crystal structure alone but depends upon adsorption films, especially water, which cover the carbon atoms and provide surfaces of low cohesion. In vacuum graphite rods or brushes seize upon a moving base (copper or graphite) and wear away as a...
A nomograph is presented which gives, in terms of film coordinates μ and Υ, the polarization factors to be applied to intensities taken from equi‐inclination Weissenberg photographs to correct them for polarization. The remaining correction, the Lorentz factor, merely involves division by cos...
A helix is a fundamental form of antenna with many radiation modes. A recently reported mode, called an axial or beam mode, occurs for a relatively wide range of helix dimensions, in the region of 0.2 to 0.5 wave‐lengths diameter and as high as 0.5 wave‐lengths spacing between turns. The...
Data obtained from sedimentation velocity and viscosity measurements on a series of cellulose acetate fractions in acetone are interpreted in terms of two models, the impenetrable ellipsoid of rotation and the uniform density random coil. The lack of agreement using the former model is shown to...
When the transient response of a linear network to an applied unit step function consists of a monotonic rise to a final constant value, it is found possible to define delay time and rise time in such a way that these quantities can be computed very simply from the Laplace system function of the...
The scattering of a TE 1, 1 wave by a thin, perfectly conducting circular ring suspended in a circular wave guide with perfectly conducting walls is considered, and approximate expressions are obtained for the scattering cross section, resonance maximum, and half‐width as a function of the...
Simplified directions are given for the making of alignment charts from equations in three variables. A fixed determinant is used to put the equation in determinantal form. The determinant is manipulated to put it in standard line form; three standard types of distortion factors are used to...
It is shown that for the case of a strongly absorbing ground (β≫1) the characteristic values D of the normal modes are given by D = D a − ( U ̇ 2 ∕ β ) + U ̇ 3 ( ∂ U ̇ ∕ ∂ D ) ∕ β 2 + … ,where β v = i ( k 0 ∕ q ) 1 3 ( ϵ 1 − 1 ) 1 2 ∕ ϵ 1 ; β h = β v ϵ 1 , D a is...
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