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Introduzioni Teoriche ad Alcuni Esercizi Pratici di Fisica

Nature volume 81, pages 125126 (29 July 1909) | Download Citation



THIS is a short treatise on a few selected subjects of practical physics. They comprise the testing of a balance and calibration of a thermometer tube, the measurement of specific heat by the method of mixtures, the determination of the constants of a ruled grating, the measurement of magnetic field-intensity and its horizontal component, and the use of the Wheatstone bridge and the quadrant electrometer. The various problems involved are treated very fully, but in a purely theoretical manner, evidently intended to point out to the instructor the difficulties and limitations likely to be encountered. Thus, in the determination of a magnetic field, the lack of uniformity is dealt with at exceptional length, and the mathematical reasoning is given in full at every step. In the measurement of the magnetic quantities M and H, account is taken of such sources of error as the rigidity of the suspending fibre, and the variation of the magnetic moment and the moment of inertia with the temperature. In adding the dimensional equations, the author unfortunately adheres to the old practice of expressing them in terms of M, L, and T only. That M/H = L3 (recte L3) implies that it has something to do with a volume, but conveys no information concerning the physical constitution of the quantities in question.

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