CHAPTER XIV. CONSTRUCTION AND USE OF APPARATUS 89

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.