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.
120
DIMENSIONS AND STANDARDS
be measured as a routine matter; if an original is found that is beyond the tolerances specified, the original should be scrapped and a new one produced". It is not wise to take anything for granted. Never assume any dimension to be correct. Measurement is quite simple and provides a direct yes-or-no answer.
Let us assume that it is necessary to check through the complete process. The starting point is a 16-mm sound recording machine using the same lot of film that is to be used in production. The test film should be developed in the same laboratory as the production film and under the same development and other conditions. Only in this manner will the result have a bearing on actual practice.
Part 1 : Locating the Center Line of a Sound Track Negative Introduction. The basic dimension for all sound film is the center line ; its location is 0.058 in. from the guided edge of the film. Because 16-mm sound-recording machines are usually designed to propel film in either direction, it is not unusual for the center line to assume two different positions; the position on a particular strip of film depending
Fig. 14. Location of negative sound track center line. No signal — no bias.
upon the direction of travel of the film through the recording machine. The difference in center-line location between "A" winding film and UB" winding film run through the same machine may be of the order of 1 or 2 thousandths of an inch ; in poorly-designed machines the difference may be much greater.
Certain designs of recording machines (such as machines with little guiding near the point of sound translation) may produce sound tracks