Diagram, 'Diagram showing the path described in 24 hours by a particle under the influence of the tidal and constant currents of figure 1' by John Young Buchanan A diagram, labelled figure 2, showing a wave on the axes of a compass. For figure 1, see PP/11/21/2. Subject: Hydrography A print of this diagram was published in volume 43 of the Proceedings of the Royal Society alongside the paper 'On tidal currents in the ocean'. 1884