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.
and to assist in this operation the wellknown Cinex Sensitometer is used by some laboratories. This instrument makes a print of eleven frames of the negative to be graded, each frame being given an exposure which is similar to that given for certain light values on the printers.
2
General practice is for the man in charge of the grading operation to visually examine the negative and assign a light change value to each scene. While doing this he either notches the negative or attaches clips to the perforations or performs the operation required to ensure that a light change takes place at the proper moment on the printer.
Sound track is generally graded by density measurement, and since in release print work the sound negative has been rerecorded and therefore is balanced for exposure, one printer light value is generally sufficient for printing one reel of sound negative.
Developing Machines
All laboratories use continuous developing machines, the size and output of which vary according to the requirements of the particular laboratory.
A developing machine usually consists of a feed-in end, comprising a splicing table
10
over which runs the roll of film to be developed, and an elevator, which is a series of loops of film containing a large enough footage to enable the machine operator to splice, or staple, on a fresh roll of film to the one in process of development without affecting the film speed in the machine. After passing through the elevator the film goes through a series of tanks containing the developer, rinsing, fixing bath, and washing water, and passes into the drying cabinet, at the far end of which is (in some cases) another elevator to permit the operator to remove a processed roll without changing the film drive speed. In Fig. 10 is shown the general lay-out of a single unit continuous developing machine, with the circulation system indicated. Since continuous developing machines differ considerably in design, however, it will be advisable to briefly discuss several different types of installation.
Some English laboratories use the Vinten developing machines, which are designed so as to be readily adaptable to existing buildings with the minimum alterations. For instance, the machines require rooms only nine feet high, and the rooms need not all be on one floor. In the standard machine the range of developing time, from three to eight minutes, is effected by a change in speed of the film drive. Hach machine, assuming that a development time of four minutes is re
Fre. 12
quired, has an output of 2,250 feet per hour.
The developing tanks have steel columns on either side. Attached to these columns is the sprocket drive shaft, which is driven by the vertical chains, see Fig. 11. The sprocket shaft slides up on the two