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.
which contains picture and sound "start' ' frames plus a series of numbers. This is the synchronising leader which is used in dual projection, and under no circumstances may the operator cut or in any other way mutilate it. If the sync-leader is shortened in length it will certainly complicate things for the next operator who tries to use it in making a change-over from one projector to another ; all of which is explained in a later chapter.
Definitions
It should be noted that common usage in the 16-mm. world has slightly altered the meanings of certain terms, but the following are those in general use to-day : —
Spool. — This is the metal container which holds the film for projection. Sizes in use are 50', ioo', 200', 400', 800', 1,600'. The 2,000' spool is also coming into use, but cannot be used on some projectors without extending the spool arms. Unless a spool is correctly filled it cannot be used to denote any particular length of film, and the term "spoor' can therefore only be of use as a measurement by virtue of its capacity alone.
Reel or Part. — This is 400' of 16-mm. film. However, many "parts" of a film are not 400', especially the last parts, and the term "reel" should be used as the standard measurement alone. If we examine a 1,600' spool just received from a library we shall probably read something like this on the label : — The Grapes of Wrath — Parts 1 — 4.
Now although the first three parts may be of 400' each, it is quite possible that part 4 may be only 300' in length, and this is usually the case with the last part of the last spool. The term "part," therefore, is a very doubtful measure, and the term "reel" should always be used to denote a standard length of 400' of film. A film in 4 parts may be 1,600', but on the other hand it may be considerably less.
Film Stock. — This usually refers to "raw" unexposed film, but may be used to describe a type of film, such as nitrate or acetate stock, etc. "Green" prints are those which are new, and which perhaps may give a little trouble by causing unsteadiness of the screened picture. The cure for this is to slacken the gate pressure until the picture becomes steady again. After a film has been projected five or six times it loses a certain amount of
62