The electric and galvanic powers have been lately employed in transmitting telegraphic signals through wires to any assignable distance. ... current to deflect a needle poised on a centre ; and, by certain arrangements, the needle is made to point to any letter on a dial plate. ... In September, 1S39, the wires of the electric telegraph were carried to Drayton, a distance of fifteen miles from London , and theanbsp;...
|Title||:||The Christian philosopher|