Electromagnetism.--Exp. 152, To study the lines of force about
a straight wire carrying a current.--Ampere's Rule.--Lines
of Force About Parallel Wires.--Exp. 153, To study the
lines of force about a coil of wire like that upon the
galvanoscope.--Exp. 154, To study the magnetic field about a
small coil of wire.--Coils.--Polarity of Coils.--Exp. 155, To
test the attracting and "sucking" power of a magnetized coil
or helix.--Exp. 156, To find whether a piece of steel can be
permanently magnetized by an electric current.--Exp. 157, To
study the effect of a piece of iron placed inside of a magnetized
coil of wire.