American practical navigator: an epitome of navigation and nautical astronomy
The 1914 Government Printing Office edition of Bowditch's American Practical Navigator, a navigation and nautical-astronomy manual first issued in 1802 and revised by the Navy's Bureau of Equipment for ship officers and cadets. The plates are line diagrams: circles divided by radii, dashed sightlines, orbital paths and lettered points, plus instrument and chart figures useful as spare geometric marks.
