. The book of photography; practical, theoretical and applied. rinciple, in whichtwo prints are used. In the Stereo-factor of Mr. A. Lockett, two exactlysimilar, non - stereoscopic prints aremovmted side by side and viewed in anordinary stereoscope, in a special holder,inclined to each other at an angle of 140°.None of these contrivances, however,although interesting and capable of givinga very fair appreciation of relief, canequal the effect produced by the examina-tion of a good stereoscopic slide in thestereoscope. Lantern Stereoscopic Projection. The principle of stereoscopy, which hasalre
. The book of photography; practical, theoretical and applied. rinciple, in whichtwo prints are used. In the Stereo-factor of Mr. A. Lockett, two exactlysimilar, non - stereoscopic prints aremovmted side by side and viewed in anordinary stereoscope, in a special holder,inclined to each other at an angle of 140°.None of these contrivances, however,although interesting and capable of givinga very fair appreciation of relief, canequal the effect produced by the examina-tion of a good stereoscopic slide in thestereoscope. Lantern Stereoscopic Projection. The principle of stereoscopy, which hasalready been set forth, shows that theproblem to be solved in lantern stereo-scopic projection is to so arrange mattersthat each eye sees only one image, andthat belonging to it, or corresponding tothe one it would see in nature. The re-searches of Dore (1841) were productiveof many suggestions in this direction, andseem to have foreshadowed the recentlyrevived anaglyph of Ducos du Hauron,which consists of a composite pictureprinted on a sheet of paper from two. ILh Fig. 849—Principle of D Almeidas EclipseBtereopticon. process blocks made from the twoelements of a stereograph, one impiessionprinted in blue and the other in red, suchpictures being viewed with a pair ofred and blue glasses. In 1858, J. , experimenting in the samedirection, devised similar means, but usedred and green discriminating glasses in-stead of red and blue, as in the formercase. When lantern projections wereinvolved, the inventor placed in the courseof the luminous rays the two colouredglasses, which have no element, orscarcely any element of the spectrum incommon. By means of these colouredglasses, one of the images projected uponthe screen is rendered green and the otherred, and, similar glasses being placedbefore the eyes, the green image alonewill be perceived by the eye covered bythe red glass, and the other by the Thi eye furnished with the green glass,principle is shown by Fig. 848. Eclip
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectphotography, bookyear
