To effect this, make a connection between the poles of the above or any
excited battery with the two ends of a wire formed into a spiral coil,
by bending common bonnet-wire closely round a cylinder, or tube, of
about an inch in diameter; into this coil introduce a needle or piece
of steel wire, laying it lengthways down the circles of the coil. In
a few minutes after the electric fluid has passed through the spiral
wire, and consequently round the needle or wire, the latter will be
found to be strongly magnetized, and to possess all the properties of a
magnet.