If an extensive power network is not available for drive power at the scanner and recorder, three alternatives can be considered. A double helix at the recorder with scanner and recorder drive essentially at same speed. A start-stop method disclosed by:
Hell (U.S. Patent 2,113,429, R.Hell) may also be employed.
The ideal, of course, is complete synchronous drive.
A companion facsimile symposium paper, prepared by:
Shore and Whitaker (RCA Institutes Technical Press, âRadio Facsimileâ, pp.270-283, by Henry Shore and J.N. Whitaker) reports on a development program directed to provide a synchronous drive system satisfactory for commercial service.
(C) Marius Rensen