Wilson's quarter century in photography : a collection of hints on practical photography which form a complete text-book of the art . h 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, the back of the plateholder, K, is pro-vided with a c
Wilson's quarter century in photography : a collection of hints on practical photography which form a complete text-book of the art . h 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, the back of the plateholder, K, is pro-vided with a corresponding pattern, R (Fig. 152, 3), and the plateholder movedby the racks and pinions, until the pin (index), which is fastened to themiddle of the shaft, D D, and precisely in the optical axis of the lens, cor-responds with a required point of the pattern; then the plate is exposal, shut,the plateholder moved to another point corresponding with the pattern andagain exposed, etc. A novel baby shutter comes from I\Ir. G. AY. Coddingtou. Fig. 153 showsa front view of the block and tube. The block is about one and a half inches.
Size: 1743px × 1433px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, bookidwilsonsquart, bookyear1887
