Abstract
Attempts have been made recently in these laboratories to measure the diamagnetic susceptibilities of inorganic salts by means of the Curie-Chéneveau magnetic balance. The results obtained have indicated that the measurements made with this instrument are influenced to a very great extent by the relative position of the specimen tube with respect to the magnet poles. For example, variations in the maximum deflection amounting to as much as 20 per cent, the figures ranging from 9.40 cm. to 7.41 cm., have been obtained when the empty specimen tube has been taken from the apparatus, the stopper removed and replaced as accurately as possible in the same position. To locate this tube exactly, special precautions were taken. Instead of using a cork to carry the hook for suspending the tube on the balance arm, as is usual, a special brass stopper covered over a short length with rubber tubing was made. This fitted the tube tightly and could always be returned to the same position by means of marks on the tube and stopper. The top of the tube was ground square to its length and a collar on the stopper fitted down on to this. With the tube empty, or containing water or salt, the maximum variation in the deflections on repeating the procedure outlined above amounted to approximately 2 cm. On repeating observations without removing the tube, merely taking successive readings, the variation in the maximum deflections rarely amounted to so much as half a millimetre.
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References
Phil. Mag., 11, 81; 1931.
Ann. Phys., 1, 169; 1929.
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HOARE, F. Accuracy of the Curie-Chéneveau Magnetic Balance. Nature 132, 514 (1933). https://doi.org/10.1038/132514a0
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DOI: https://doi.org/10.1038/132514a0
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