Exp. 101, To study the effect of the electric current upon
the magnetic needle.--Electrical Connections.--Current
Detectors.--Exp. 102, To study the construction and use of a
simple "key."--Exp. 103, To study the construction and use of
a simple "current reverser."--Exp. 104, To study the simple
current detector.--Exp. 105, To study the construction and use
of the simple galvanoscope.--Discussion; True Readings.--Exp.
106, To study the construction and use of a simple astatic
needle.--Astatic Needles.--Exp. 107, To study the construction
and use of a simple astatic galvanoscope.--Astatic Galvanoscopes.