The telegraph manual: a complete history and description of the semaphoric, electric and magnetic telegraphs of Europe, Asia, Africa, and America, ancient and modern.

NOTT'S ELECTRIC TELEGRAPH.
CHAPTER XXI.
ELECTRIC DIAL TELEGRAPH.
ON the 20th of January, 1846, Mr. John Nott, of England,
took out a patent for a particular description of an electric telegraph.
Fig. 1.
t,,' 78.
p0 /1
a 7
10y