Figure 122.—Printing the fascicles of the Atlas of Tumor Pathology.
casting significant segments of medical subjects through the medium of motion-picture films or kinescopes of operations and techniques (fig. 125).
The possibilities inherent in such additional uses of the television camera have been enormously enlarged by the development of video magnetic tape. This development, which is compatible with the equipment at Walter Reed, records the living program, both picture and sound, on magnetic tape, from which it can be transferred to motion-picture film, available for showing on any 16-mm. projector, or can be reproduced directly from the tape wherever compatible equipment is available. Thus, a program recorded on video tape is multiplied many times over as an educational medium, reaching by sight and sound many audiences besides the original viewers of the program. Indeed, the potential audience is as vast as that afforded by the nationwide network of television cables, microwaves, broadcasting stations, and receiving sets that make up the great system of visual and sound intercommunication, included in the one word—television.
Of more immediate application, however, is the practice of exhibiting programs, through closed-circuit facilities, to audiences assembled in Dart Audi-
