Plate, figure 6 showing effect of compound waves on tide by William Whewell Figure 6 showing a diagram of the effect of compound waves on the tide. A later version of this diagram is found at PT/34/1/5. The very first drafts of this diagram are found at PT/34/1/8. Subject: Hydrography Published in Philosophical Transactions as 'The Bakerian Lecture.—Researches on the tides. Thirteenth series. On the tides of the Pacific, and on the diurnal inequality'. Written by Whewell in Trinity Lodge, Cambridge. Received by the Royal Society on 11 November 1847. Read 16 December 1847. 8 November 1847