International communication via facsimile, wether over wire or radio, requires a set of standarts, which, if adhered to, will allow for design variation. Among other things, the standards include a working index and a specification covering drive-control accuracy.
Schroter (Handbuch der Bildtelegraphie und des Fernsehens by F. Schroter, published by Julius Springer, Berlin)
reports that H. Stahl was responsible for suggesting the working index.
The CCIT 3rd (CCIT Third Conference, Berne, May, 1931),
4th (CCIT Fourth Conference, Prague, August, 1934), and
5th (CCIT Fifth Conference, Warsaw, 1936)
Conferences have set up working standards which are now recognized by all engaged in international facsimile service.
For some services where an extensive power network is available, only phase correction is required when starting. A phasing signal can be transmitted which provides the necessary phasing or framing pulse for utilization at the receiver. Other arrangements on the order of that disclosed may prove useful.by:
Rieper (U.S. Patent 1,857,742, G. Rieper)
(C) Marius Rensen