Wilson's quarter century in photography : a collection of hints on practical photography which form a complete text-book of the art . he mirror, fastened ona w^ooden frame, is fixed at an angle of 45 de-grees with the front of the camera. Themirror must have a perfectly plane surface,and may be made of speculum metal, care-fully polished, or of glass silvered on Its sur-face. A convenient general size for the mirroris 4 X 3 inches. At the upper part of the boxmay be a small door for insertion of dia-phragms. It is not at all difficult to silverthe mirror, several methods having been pub-lished
Wilson's quarter century in photography : a collection of hints on practical photography which form a complete text-book of the art . he mirror, fastened ona w^ooden frame, is fixed at an angle of 45 de-grees with the front of the camera. Themirror must have a perfectly plane surface,and may be made of speculum metal, care-fully polished, or of glass silvered on Its sur-face. A convenient general size for the mirroris 4 X 3 inches. At the upper part of the boxmay be a small door for insertion of dia-phragms. It is not at all difficult to silverthe mirror, several methods having been pub-lished in the books on photography. Thereshould be no difficulty in using this arrange-ment for ferrotypes, as speculum mirrors werecommonly used by daguerrotypists for thesame purpose. The same contrivance may beused for copying articles on the ground whichcannot, without much labor, be fastened to aplane board—a lot of shells, for example, orfruit, or an engraving which you do not wishto mutilate, etc. The advantages of copying on the ground by mean& of the mirror arereally very considerable, as you will readily understand. \. B A, mirror supported on wooden frame. B, door to mirror-box. C, small door to change diaphragms. D D, screws to slide mirror up or down slots. E, button to fasten mirror-box on front of camera. UNDER THE SKYLIGHT. 137 camera (Figs. 152, 1 and 2) consists mainly of a draw-box, with frame, b 6,for the plateholder and ground-glass. A grooved shaft (Fig. 152, 2), D, 1) is at-tached to the frame b b. With this shafttwo pinion-wheels, c c, are connected,which work into the racks, fastened tothe plateholders. If the shaft is turnedby the buttons, o, the plateholder willbe raised or lowered in any requiredposition, and their position retained bythe ratchet and wheel, aS (Fig. 152, 2).Both the pinions, c c, are movable onthe shaft D. The plateholder, K (, 3) may be placed in any positionby such an arrangement. To make different exposures in a required order,
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Keywords: ., bookcentury1800, bookdecade1880, bookidwilsonsquart, bookyear1887
