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It is shown how punched card machines can be used for solving ordinary linear differential equations of the second order.
A profilograph, using a tracing point and optical lever system, makes profiles of fine textured surfaces, magnifying the elevations and depressions by as much as 6000×. With this instrument it is possible to detect surface variations as small as 0.04 micron. It is also possible to make a series...
Some months ago the RCA License Laboratory, in connection with television development, had occasion to make measurements on the spectral characteristics of optical filters. The conventional and elaborate equipment usually used for such purposes was not immediately at hand, and a cathode‐ray...
This paper describes a new technique for preparing thin nickel targets ranging upward in thickness from 10 −6 cm. The targets are approximately 10 cm 2 in area and are backed by films of cellulose acetate 5⋅10 −6 cm thick. The periphery of the target is supported by a flexible array of fine...
The practical working part of the theory of the Svensson method for the direct photography of concentration gradients is presented, along with the design of a special diagonal slit for the accurate evaluation of diffusion constants, or the concentration of material present from the areas under...
Eddy current induction effects have been utilized in the construction of a simple electrical device whose voltage output is proportional to either rotational or vibratory accelerations. The output of the device is shown to be directly proportional to harmonic linear accelerations of small...
The use of foil or mica washers to regulate absorption cell thicknesses renders difficult the rapid preparation of thin films of liquids of a determined thickness. The device described here regulates cell thickness by means of a micrometer screw and wedge arrangement. Films of non‐volatile...
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