The Optical Lantern and Cinematograph Journal (Nov 1904-Oct 1905)

THE OPTICAL LANTERN AND CINEMATOGRAPH JOURNAL. > Stereoscopic Notes. <f The Natural Stereoscope. This is the name given to a new stereoscope of the reflecting type, now selling by Mr. W. Tylar, of 41, High Street, Aston, Birmingham. As shown in the annexed cut, the stereoscopic slide is placed facing two inclined mirrors. The observer looks over the back of the view, as shown, and sees apparently beyond the mirrors, a combined or compound image in stereoscopic relief. By this arrangement the eyes are permitted to converge in their natural manner, whilst no adjustment for focussing purposes is needed. We have inspected views in this instrument, and find that the name Natural is well merited, there being quite a decided consciousness of ease to the eyes whilst inspecting the pictures. The Stereo -Gothard Attachment. Although the American pattern stereoscope, as designed by Oliver Wendell Holmes, is more convenient in many respects to the old box pattern of Brewster, the latter had the advantage of shutting out all light except that required for the inspection of the pictures. We now learn of a combination of the two under the above title, and whilst we cannot go so far as the inventor in claiming a new era in slereoscopy by its introduction, we certainly consider it a good idea. Its general appearance is not exactly neat, but its efficiency compensates for any ugliness its outward aspect may present. Imagine a Brewster stereoscope without lenses, fixed in the place of the view hulder of an American scope, and you have a fair idea of the purpose and appearance of this instrument. It should be mentioned that the views issued with the Stereo-Gothard form a combination of opaque and semi-transparent pictures. When inspected by reflected light, by having the top of the box open, the views present the appearance of the ordinary silver print without colour ; on closing the top and inspecting the pictures by transmitted light, the semi-transparencies at once appear in colours, in addition, of course, to possessing the usual stereoscopic effects. The publishers are the American Stereoscopic Company, 725, Broadway, New York. "A Photographic Tour to Dublin." This is the title ot an illustrated lecture now circulating by the United Stereoscopic Society. .Mr. A. J. Snow, of 84, St. Andrew's Road, Walthamstow, is the secretary. Prizes for Stereoscopic Work. In connection with the Leicester and Leicestershire Photographic Soeiety's Exhibition, a framed plaque, bronze medal, and certificates will be awarded, in the Open and Members' Classes, for sets of four stereoscopic slides. Further particulars and entry forms may be obtained from the Exhibition Secretaries, 18, Market Place, Leicester. A Stereoscopic Range Finder. A very clever method of estimating the distance of objects has been conceived by two German gentlemen, which in principle is somewhat similar to the old " Telesterescope " of Claudet in i860. As the new instrument is fully described under Patents No. 2I,S87, we need make no further reference to it here. The StereoPhoto-Duplicon. Mr J. Fallowfield, of Charing Cross Road, London, is placing on the market an instrument by which the dissimilar pair of pictures for the stereoscope may be obtained simultaneously in any camera having but one lens. Its principle will be understood by refeience to the cut. Suppose the object to be taken to be situated at E, E, the camera at n, and lens at c. By reflection two phases of the object are secured thus : — by reflection from the mirrors A A to B B, and from thence through the lens to the sensitive plate. The advantages claimed are : no transposition required when printing from negatives obtained ; no division in the camera needed ; any separation of the companion images instantly obtained by varying the angle of one of the outside miirors camera transformed from an ordinary to a stereoscopic one in a few seconds.