cylinder

device

Learn about this topic in these articles:

In fax: Early telegraph facsimile
…were transmitted and received on cylinders—a method that was widely practiced through the 1960s. At the transmitter the image to be scanned was written with varnish or some other nonconducting material on tinfoil, wrapped around the transmitter cylinder, and then scanned by a conductive stylus that, like Bain’s stylus, was…
Read More