Facsimile photograph of a pencil drawing by Sir John F.W. Herschel, Bart., K.H., June 28, 1824. Sketched by means of a Wollaston's camera Lucida. Temple of Juno, Girgenti, Sicily. Sketch no.393. In glazed frame 9 1/4"x7 3/4" outside

Photograph of a pencil drawing made by Sir John Herschel (1792-1871) in 1824 at the 'Temple of Juno' at Girgenti in Sicily. The son of William Herschel, the famous astronomer, John Herschel was a renowned astronomer and scienist in his own right. Herschel made this drawing using a Wollaston Camera Lucida, a drawing aid that allowed the user to accurately delineate the scene being sketched. William Hyde Wollaston (1766-1828) invented the device in 1806 in an attempt to improve his sketching abilities. This was prompted by frustration at his inability to made sketches of the sights he saw during a walking holiday around Europe.