\Tel`e*graph"o*scope\, n. [Gr. th^le far +
-graph + -scope.]
An instrument for telegraphically transmitting a picture and
reproducing its image as a positive or negative. The
transmitter includes a camera obscura and a row of minute
selenium cells. The receiver includes an oscillograph, ralay,
equilibrator, and an induction coil the sparks from which
perforate a paper with tiny holes that form the image.