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Of the criteria that are used in the design of servomechanisms, the so‐called ``minimum mean‐square'' error criterion is used quite widely in cases where the undesirability of the error increases with its magnitude. There is, however, an important class of applications, particularly in the...
This paper summarizes the experimental and theoretical status of the optical chronograph developed in the course of ballistic research at the Naval Research Laboratory. The instrument, together with a simple procedure for analysis of data, is capable of yielding the position, velocity, and...
A phenomenological law of optical birefringence, induced by small strain in viscoelastic materials, is formulated and applied to an idealized medium. The resulting optical‐stress‐strain‐time‐temperature relations are used in finding conditions under which models made of viscoelastic...
A photo‐density method for the determination of diffusion of radioactive tracer is presented and compared in detail to a thin section analysis method. The method is no doubt applicable to similar tracer problems such as metal diffusion studies. The proper analysis of an emulsion exposed by...
Both the spherical and the chromatic aberration of electron microscope objectives may, in principle, be corrected with the aid of a uniform retarding field acting as a mirror. Such an arrangement has the drawback of requiring a conducting film in the ray path and the insertion of the specimen in...
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