effect was somewhat more, but still very small.

106. When an amalgamated copper wire, one eighth of an inch thick, was
drawn through between the conductors and poles (101.), it produced a very
considerable effect, though not so much as the plates.

107. If the conductors were held permanently against any particular parts
of the copper plates, and carried between the magnetic poles with them,
effects the same as those described were produced, in accordance with the
results obtained with the revolving disc (94.).

108. On the conductors being held against the ends of the plates, and the
latter then passed between the magnetic poles, in a direction transverse to
their length, the same effects were produced (fig. 22.). The parts of the
plates towards the end may be considered either as mere conductors, or as
portions of metal in which the electrical current is excited, according to
their distance and the strength of the magnet; but the results were in
perfect harmony with those before obtained. The effect was as strong as
when the conductors were held against the sides of the plate (101.).

109. When a mere wire, connected with the galvanometer so as to form a
complete circuit, was passed through between the poles, the galvanometer
was affected; and upon moving the wire to and fro, so as to make the
alternate impulses produced correspond with the vibrations of the needle,
the latter could be increased to 20° or 30° on each side the magnetic
meridian.

110. Upon connecting the ends of a plate of metal with the galvanometer
wires, and then carrying it between the poles from end to end (as in fig.
23.), in either direction, no effect whatever was produced upon the