Recording equipment positioned at a distance from the scanning machine requires some form of synchronizing in order to hold the skew distortion to a useable minimum. In 1869 dÂ´Arlincourt employed a tuning fork for synchronizing control. Other early methods of synchronizing are illustrated by:
The effect of a small synchronization error. The example on the left was reproduced by a correctly synchronizized recorder. The example on the right shows the effect of the successive line displacement, or âskewâ caused by a small difference between the linear speeds of the transmitter and the recorder.
Amstutz (U.S. Oatent 1,019,403, N.S. Amstutz) and
Belin (U.S. Patent 1,260,303; U.S. Patent 1,535,979, E. Belin).
This bibliography has covered two types of equipment, namely, drum and linear feed, and facsimile tape. Synchronizing arrangements will be treated under the next sections respectively.
(C) Marius Rensen