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THE MAGNETIC TgLEGRArH.-ConsIderaole
progress has been made in the construction OF the
Magnetic Telegraph, the invention OF Professor
S. F. b. MORSE, upon which test experiment
is being made under the authority OF an act o,
Congress. The line of conductors Is CONSTRUCTED
as far ON from Washington as TO point on llle ~
line of the railroad opposite to the residence Of
B. CALVERT, Esq. (six miles,, and the worh X l. Is
making progress at the rate Of about lil.ie Joy
A trial of it was made yesterday as tne cars
passed Mr.. CALvERr's, by communicating Tue
fact of their passage to the point at wnicn lhe
line begins in Washington; and an answer ac-
knowledging the receipt OF the in'ehgence' was
received back in two or three seconds.


Nat. Int. yesterday.