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Stress functions are given for forty nuclei of strain in the semi‐infinite elastic solid. The corresponding stresses have the property that the traction vanishes across the plane boundary of the solid. The nuclei are derived, by processes of superposition, differentiation and integration, from...
A method is described for the measurement of the thickness of thin films using the multiple beam interference techniques. Only simple equipment is required, but reduction of the order of interference to as low as one makes possible the measurement of average thicknesses down to 10A. Applications...
The distribution in energy of Johnson noise pulses (random thermal voltages in a resistor) is derived and checked against pulse‐height measurements made with a linear amplifier and electronic counter. The following parameters are determined from the distribution function: (1) time of flight...
Phenomena not seen or recorded by orthodox methods are observed on the large number of micrographs which are taken during a motion picture experiment, and reaction times as short as 0.03 sec. can be calculated. The technique is useful for investigating solid‐liquid‐solid changes both by...
In the ordinary simple microscope, the same light is permitted to flow through the entire system. A more general microscope can be devised in which light of one wave‐length is permitted to flow as far as the diffraction image of the object, then light of a second wave‐length is substituted at...
The scattering of an arbitrary electromagnetic field by a conducting or non‐conducting obstacle is investigated. The differential equations and boundary conditions satisfied by the field are transformed into a pair of inhomogeneous linear integro‐differential equations for E and H . For an...
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