Only A Film Cartridge: Once a cartridge is fully loaded with collected contaminant the ease of cleaning it for re-use, either manually or automatically, depends on the nature of the Filter medium used and on the construction of the cartridge. In this respect Purchas (1996) identified four categories of cartridge:
(a) the 'throw away' or 'disposable' cartridge, which cannot be cleaned and is therefore discarded and replaced once it has been fully loaded
(b) the 'cleanable-in-place' cartridge, which is readily cleaned (for example, by intermittent reverse flow as part of the operating cycle of the filter) and reused several times before it is replaced is given in Table 8.20, which indicates also their general application and properties.
A major study on the use of computer technology in crime control was presented by the system was essentially a new photographic process and should not be confused with TV magnetic tape recording. It will play back only a film cartridge made by a professional firm and will not allow for home recording of commercial television programs. Besides motion pictures the system is expected to be used for reference material. For example, all the contents of a 24-volume encyclopedia could be recorded on a cartridge, with an index lever supplied to enable the viewer to select the particular reference material he desires. A seven-inch cartridge will be able to provide an hour of black-and-white or one-half hour of color motion pictures.
Economically, the new system allows for much greater speed and lower cost in producing films, as compared with conventional film duplication. CBS has estimated that a 20-minute cartridge can be made to sell for $7 and produced on mass duplication machinery in 13 seconds. Comparable 8-mm film costs $30 or more per print and takes almost as much time to copy as to project.
The Imperial Chemical Industries, Ltd., of Great Britain and Switzerland's CIBA Ltd. are joining with CBS in marketing the system. They have planned to make it available for purchase by late 1969 or early 1970.
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Photography
