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.
viii DEVELOPING AND PRINTING PICTURES 83 while the interior, divided into two compartments, contains the driving mechanism and the illuminating agency for printing. The apparatus is so designed that after printing the films are wound upon separate spools at once, thus saving time, and dispensing with the necessity of a box or basket to gather the loose films, which is both a dangerous and an unsatisfactory process, inasmuch as the films are liable to become damaged by curling and cracking, and through the surfaces rubbing against one another. The negative film is placed upon the spool A imme- diately below which is the positive film spool B. The sensitised surfaces of the two films face one another, and the two are brought together as they pass under the grip rollers and over the toothed sprocket C, where the teeth mesh with the perforations in the respective films. Issuing from this sprocket a loop is formed, and then the films enter the gate D over the printing aperture. This gate is side-hinged, and when closed it presses evenly upon the whole surface of the films under exposure, ensuring a perfect even contact. There is a small red screen E, which, when released by means of a small lever, drops down, thus enabling the negative to be examined without danger of the positive film being fogged in the operation. By this means the printer can satisfy himself that the picture is central to the exposure hole. As the picture is printed, a simple claw device F, resem- bling two hooked fingers, engages with the perforations in the two films and draws them downwards. This claw device is of very simple construction, working on a cam, so that when the film has moved downwards the proper distance—sufficient to bring the succeeding picture and its area of unexposed positive film before the printing aperture —the fingers disengage themselves from the films, rise, and move upwards to drop into other perforations and repeat the operation. As the film descends, it forms a loop, and passes under a double smooth-faced roller and a toothed sprocket G, at which point the two films part company, the positive to be wound upon the bobbin H, while the negative film is G 2