We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
382
LA RUE
October
distance of 8 inches. The camera base, lens support, and the upper and lower parts of the camera back are all iron castings. The lens support and camera-back castings slide independently on a steel dovetail which is mounted on the camera-base casting. These castings are fitted to the dovetail in the same manner as the cross-slide on a lathe, with the exception that the center adjustment screw and nut on each have been replaced by a thumbscrew. The thumbscrews are used to lock either the lens support or camera back in place when desired. The cast construction, together with the locking provision, contributes the utmost toward camera rigidity.
LENS SUPPORT
CAMERA BACK
Fig. 3 — Focusing mechanism.
At the rear of the camera (Fig. 2), convenient to the photographer, is the focusing knob. This knob is calibrated in thousandths of an inch, and moves either the lens support or camera back, whichever is desired. If the camera back is to be moved, the rear thumbscrew is loosened and the front thumbscrew tightened. The focusing knob then moves only the camera back. Loosening the lens support and tightening the back moves only the lens support.
Direct location of the photographic plate by the camera is accomplished by lightly holding it against six locating buttons in the camera while the exposure is being made. Since daj^light loading was a convenient feature, it was necessary to be able to replace the dark slide of the plateholder before removing the placeholder from the camera. The plate, however, first had to be retracted from the locating buttons