Tides and Tidal Streams: A Manual compiled for the Use of Seamen

Abstract

THE author of this manual is convinced, and not without cause, that the non-harmonic methods of giving and using tidal information at ports not served by complete predictions are obsolete and not trustworthy. These methods assume the simple phenomenon of semi-diurnal tides only and came into prominence because the original workers on tides were most familiar with the tides in European waters. But in most parts of the world the diurnal tides cannot be neglected, even if they are not of greater importance than the semi-diurnal tides, and at present navigators are not provided with information suitable for the calculation of tidal heights in such places. Commander Warburg suggests that the tides should be represented universally by a few harmonic constituents, and that navigators should be taught suitable methods for getting approximate values of the height of tide at any time by the use of harmonic methods.

Tides and Tidal Streams: A Manual compiled for the Use of Seamen.

By Comdr. H. D. Warburg, R.N. Pp. vii + 95. (Cambridge: At the University Press, 1922.) 8s. 6d. net.