You searched for: “synchronograph
synchronograph (s) (noun), synchronographs (pl)
A device used in the method of sine-wave telegraphy (communication at a distance by the use of electric transmission over wire) of Crehare and Squier: A synchronograph is an automatic recording telegraph worked by an alternating electric current, with a synchronously moving strip of perforated paper.
This entry is located in the following unit: chrono-, chron- (page 11)