The Royal Photographic Society's Annual Exhibition

Abstract

THE Royal Photographic Society's Exhibition was opened on Monday, September 15, and will remain open until October 25, with free admission, at 35 Russell Square. The Scientific and Technical Section is probably the largest and in a general sense the most interesting that the Society has ever been able to arrange. Among the astronomical exhibits are photographs of nebulae made at the Mount Wilson Observatory by the 60-inch and the 100-inch reflecting telescopes, illustrating Dr. Edwin Hubble's pro-posed general classi? cation of nebulae, and a frame that shows the different degrees of elongation of elliptical nebulae. Dr. William J. S. Lockyer, director of the Norman Lockyer Observatory, Sidmouth, sends some striking photographs of star spectra, and what is, with little doubt, the most successful photograph of a meteor that has ever been secured. Various forms of clouds and their changes are illustrated by several contributors, and geological work by one exhibit from the National Geographic Society of Washington. Closely allied to this are several “survey and record “photographs from the United States and Canada, a very notable one being a photograph, by Dr. W. H. Wright of the Lick Observatory, of the Sierra Nevada Mountains in the neighbourhood of the Yosemite Valley, taken from the Observatory on Mount Hamilton. The details shown range in distance up to 135 miles, and several comparative details are indicated which clearly demonstrate the effect of the curvature of the earth in depressing the more distant as compared with the nearer hills.