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Illustration page from Philosophical Transactions. Page with illustrations and diagrams from a 1667 issue of 'Philosophical Transactions of the Royal Society of London'. These illustrations precede page 433 of volume 2, and accompany issue 24, dated 8 April 1667. They show navigational instruments, accompanying an article on 'directions for observations and experiments to be made by masters of ships, pilots, and other fit persons in their sea voyages.' The detailed descriptions are on pages 433-448, with the whole issue devoted to this topic.
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