Currents and Motion.--Exp. 183, Motion produced with a hollow
coil and a piece of iron.--Exp. 184, Motion with hollow coil
and bar magnet.--Exp. 185, Motion with electromagnet and
piece of iron.--Exp. 186, Motion with electromagnet and bar
magnet.--Exp. 187, Motion with electromagnet and horseshoe
magnet.--Exp. 188, Motion with two electromagnets.--Discussion
of Exps. 183-188.--Exp. 189, Rotary motion with a hollow coil
of wire and a permanent magnet.--Exp. 190, Rotary motion with
an electromagnet and a permanent magnet.--Discussion of Exps.
189-190.