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.

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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. Public Domain Mark. Source: Wellcome Collection.