The machine of the opposite illustration, “the telestereograph,” is the
invention of T. Thorn Baker, Esq., of England, and “was used by the
_London Daily Mirror_ in July, 1909, and was worked by wire rather
regularly between London and Paris, and London and Manchester.” The
picture to be sent was “a halftone photograph printed in fish glue on
lead foil, and wrapped on a sending cylinder, rotating once every two
seconds with a metal point riding on it.”
The receiving cylinder carried “an absorbent paper impregnated with a
colorless solution which turns black or brown when decomposed by the
incoming electric current.”
What electrolytic solution was employed is not stated in the report, but
was probably sodium iodide or potassium bromide judging from the
description of its color and behavior.
To synchronize, the receiving drum turns faster than the sending drum,
and is caught each revolution until the other catches up. (_Smithsonian
Report_, 1910.)
[Illustration: 2. FASHION PLATE TRANSMITTED BY PROFESSOR KORN’S
TELAUTOGRAPH.]
2. FASHION PLATE TRANSMITTED BY PROFESSOR KORN’S
TELAUTOGRAPH.