The seaman's tutor, explaining geometry, cosmography, and trigonometry : with requisite tables of longitude and latitude of sea-ports, traverse tables, tables of easting and westing, meridian miles, declinarions, amplitudes, refractions, use of the compass , kalendar, measure of the earth's globe, use of instruments and charts, difference of sailing, estimation of a ship's way by the log, and log-line, currents, & c. : compiled for the use of the mathematical school in Christ's hospital-London, His Majesty Charles II, his royal foundation
The seaman's tutor is a 1682 London navigation textbook compiled by Peter Perkins for the mathematical school at Christ's Hospital, covering geometry, cosmography, trigonometry, and sailing tables. Its woodcut diagrams show right triangles with labelled sides, celestial spheres with horizon and meridian lines, and a circle divided into arcs, useful to a designer seeking simple, schematic line drawings with clear labelling.
