Gnomonicks, or the art of shadows improved. Plainly set forth in the drawing of sun-dials on all sorts of planes by different methods. With the geometrical demonstrations of all the operations / By Mr. De La Hire ... Englished and illustrated with cutts. By J. Leek.

Licence: Public Domain Mark

Credit: Gnomonicks, or the art of shadows improved. Plainly set forth in the drawing of sun-dials on all sorts of planes by different methods. With the geometrical demonstrations of all the operations / By Mr. De La Hire ... Englished and illustrated with cutts. By J. Leek. Source: Wellcome Collection.