Abstract
THIS little work is intended to furnish information as to the practical details of a magnetic survey. The description of the instruments used is poor. Full details as to the necessary calculations are given. The directions for the use of the instruments involve in a few cases un necessary precautions, while in others the method suggested appears rather rough. Thus the statement that it is advisable not to make any observations with a dip needle till ten minutes after magnetization, is not, we think, borne out by experience. On the other hand, the suggestion that the vibrations of a declination needle may be checked by the finger would be likely to mislead beginners. It would have been better to describe the method of bringing the magnet to rest by means of a small auxiliary magnet. On the whole, English students will probably find all that they want, and with more direct reference to the Kew pattern instruments, in Stewart and Gee's “Practical Physics,” and are thus not likely to make much use of Mr. Nipher's work.
Theory of Magnetic Measurements.
By F. E. Nipher, Professor of Physics in Washington University. (London: Trübner and Co., 1887.)
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R., A. Our Book Shelf . Nature 36, 316 (1887). https://doi.org/10.1038/036316a0
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DOI: https://doi.org/10.1038/036316a0