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

740 TELEGRAPH APPARATUS.
KS I - -furnishing the vehicle with a circuitbreaker, circuit receivers and conductors,
arranged to operate substantially as set
forth, for the purpose of breaking the
circuit through the main line at a point
or points where the vehicle is passing,
and completing the circle through, so
1? that by suitable telegraphing instruJ Lk ments or apparatus carried by the said
vehicle, communications may be transmitted and received by the vehicle to
and from other vehicles, and to and from
[ — stations at a distance, either while the
L _ -i ~ vehicle or vehicles are stationary or in
jI_ _ l 11 motion, as set forth.
XIV. IMPROVED ELECTRO-MAGNET.
By Charles T. and J. N. Chester, New-York.
This improvement consists in the adjustment of tlhe horseshoe core and the spools of wire, so that they can be moved to
and from the armature by the screw P seen in the figure.