On this day in 1882 Thomas Edison was granted the patent for Magneto Electric Machine. U.S. Patent No. 264,643.
In this machine Edison employs a cylinder the surface of which is covered with a coil of wire wound around it lengthwise and parallel to the axis of rotation. The electric current, passing through the coil, converts the cylinder into a magnet. One side of the cylinder is of north polarity and the opposite side is of south polarity. A shell of iron is employed, within which this magnetic cylinder is revolved, and by induction the shell becomes magnetized. Hence the magnetic forces in the shell revolve around the same in harmony with the revolving magnetic cylinder.
There is a space between the revolving magnetic cylinder and the inside of the shell, within which space there are longitudinal wires connected in a peculiar manner to the commutator, and in the wires an induced current is set up in consequence of the revolving magnetic forces crossing and cutting these wires as the magnetic cylinder revolves within the shell, and trout the commutator the current is taken to the line-wires.
