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A closed circuit respirometer is described which circulates a given volume of water through the chamber containing the fish and equilibrates the water with a small volume of air. As oxygen is consumed by the fish, its removal from the air space is indicated manometrically, and is compensated for...
An apparatus is described by means of which the index of refraction of opaque materials may be determined as a function of wave‐length. The method is based essentially on the determination of Brewster's angle by reflection of polarized light from a polished surface. Typical data are given, and...
The circuit and performance characteristics of a simple high voltage stabilizer of the degenerative type are presented. The regulator is inserted in the positive side of the high voltage line; the design given finds particular application for electron diffraction power supplies in which the...
A device for measuring electric charges of the order of 1.5×10 −11 coulomb with a probable error of approximately one percent is described. The apparatus was designed to measure the ionization produced in air by roentgenographic apparatus. For that purpose the apparatus consists of two...
An apparatus for the rapid determination of the magnetic moment of thin, circular plates of ferromagnetic material, uniformly magnetized in a direction perpendicular to their surface, is described. The method consists in rotating the specimen about a diameter near a fixed pick‐up coil and...
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