A Cheap Transmitting Set (No. 1)--The Spark Coil--The Battery--The
Telegraph Key--The Spark Gap--The Tuning Coil--The High-tension
Condenser--A Better Transmitting Set (No. 2)--The Alternating Current
Transformer--The Wireless Key--The Spark Gap--The High-tension
Condenser--The Oscillation Transformer--Connecting Up the
Apparatus--For Direct Current--How to Adjust Your Transmitter. Tuning
With a Hot Wire Ammeter--To Send Out a 200-meter Wave Length--The Use
of the Aerial Switch--Aerial Switch for a Complete Sending and
Receiving Set--Connecting in the Lightning Switch.

V. ELECTRICITY SIMPLY EXPLAINED

Electricity at Rest and in Motion--The Electric Current and its
Circuit--Current and the Ampere--Resistance and the Ohm--What Ohm's
Law Is--What the Watt and Kilowatt Are--Electromagnetic
Induction--Mutual Induction--High-frequency Currents--Constants of an
Oscillation Circuit--What Capacitance Is--What Inductance Is--What
Resistance Is--The Effect of Capacitance.

VI. HOW THE TRANSMITTING AND RECEIVING SETS WORK

How Transmitting Set No. 1 Works--The Battery and Spark Coil
Circuit--Changing the Primary Spark Coil Current Into Secondary
Currents--What Ratio of Transformation Means--The Secondary Spark Coil
Circuit--The Closed Oscillation Circuit--How Transmitting Set No. 2
Works--With Alternating Current--With Direct Current--The Rotary Spark
Gap--The Quenched Spark Gap--The Oscillation Transformer--How
Receiving Set No. 1 Works--How Receiving Set No. 2 Works.

VII. MECHANICAL AND ELECTRICAL TUNING