Abstract
THIS pamphlet forms Part 5 of the “Handbook of Professional Instructions ”(Third Edition) for the Geodetic Branch of the Survey of India. The three chapters, which are separately paged, deal with “Theory and Computation,” “Tidal Observations,” and “The Tide-Predicting Machine.” Tidal observations were commenced in India in the year 1873, and the Survey at once adopted the harmonic methods of analysis and prediction then being developed. The original methods, however, have been continued almost without modification to the present day, though there are in existence several methods of analysis which are more accurate and involve very much less labour. Similarly, in prediction, no use is made of the modern method whereby the phase-lags are modified once for all so as to use only one set of computed initial ‘ astronomical arguments,’ instead of 40 sets, as in India. Thus it is unlikely that this volume will be used as a manual outside the Survey, especially as it would be impossible to use the instructions adequately without a supply of the printed forms used in India. Apart from this, of course, the volume appears to give a satisfactory account of the processes used.
Survey of India. The Tides.
Revised by Major C. M. Thompson. Pp. vi + 140 + 30 + 50. (Dehra Dun: Geodetic Survey of India, 1926.) 2 rupees; 3s. 6d.
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Survey of India The Tides . Nature 122, 993 (1928). https://doi.org/10.1038/122993a0
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DOI: https://doi.org/10.1038/122993a0