This is a reprint of
Joley, Charles Jasper and James Waterhouse. "Camera Obscura." in Encyclopædia Britannica. Eleventh Edition. ("Handy Volume Issue") NY: Encyclopædia Britannica Company, 1910. Vol. V, pp. 104-107.
The notes on the contributors describe Charles Jasper Joley, F.R.S., F.R.A.S. (1864-1906) as:
Royal Astronomer of Ireland and Andrews Professor of Astronomy in the University of Dublin 1897-1906. Fellow of Trinity College, Dublin. Secretary of the Roayal Irish Academy. (vi)
Major-General James Waterhouse ("History" section) is described as:
Indian Staff Corps. Vice-President of the Royal Photographic Society. Assistant Surveyor-General in charge of Photographic Operations in the Surveyor-General's Office, Calcutta, 1866-1897. Took part in the observation of total eclipses, 1871 and 1875, and of transit of Venus, 1874. President of the Asiatic Society of Bengal, 1888-1890. Author of The Preparation of Drawings for Photographic Reproduction; &c. (ix)
These biographical details differ very slightly from those presented for his contribution to the article on "Photography" (Abney, Waterhouse, & Hinton) also reprinted in this Library of Antiquarian Technology.
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