The Study of Electricity. First Historical Accounts. Bottling Electricity. Discovery of Galvanic Electricity. Electro-motive Force. Measuring Instruments. Rapidity of Modern Progress. How to Acquire the Vast Knowledge. The Means Employed.

Preparing the Workshop. Uses of Our Workshop. What to Build. What to Learn. Uses of the Electrical Devices. Tools. Magnet-winding Reel.

The Two Kinds of Magnets. Permanent Magnets. Electro-Magnets. Magnetism. Materials for Magnets. Non-magnetic Material. Action of a Second Magnet. What North and South Pole Mean. Repulsion and Attraction. Positives and Negatives. Magnetic Lines of Force. The Earth as a Magnet. Why the Compass Points North and South. Peculiarity of a Magnet. Action of the Electro-Magnet. Exterior Magnetic Influence Around a Wires Carrying a Current. Parallel Wires.

Three Electrical Sources. Frictional Electricity. Leyden p. iiJar. Voltaic or Galvanic Electricity. Voltaic Pile; How Made. Plus and Minus Signs. The Common Primary Cell. Battery Resistance. Electrolyte and Current. Electro-magnetic Electricity. Magnetic Radiation. Different Kinds of Dynamos. Direct Current Dynamos. Simple Magnet Construction. How to Wind. The Dynamo Fields. The Armature. Armature Windings. Mounting the Armature. The Commutator. Commutator Brushes. Dynamo Windings. The Field. Series-wound Field. Shunt-wound. Compound-wound.

Measuring Instruments. The Detector. Direction of Current. Simple Current Detector. How to Place the Detector. Different Ways to Measure a Current. The Sulphuric Acid Voltameter. The Copper Voltameter. The Galvanoscope Electro-magnetic Method. The Calorimeter. The Light Method. The Preferred Method. How to Make a Sulphuric Acid Voltameter. How to Make a Copper Voltameter. Objections to the Calorimeter.

Understanding Terms. Intensity and Quantity. Voltage. Amperage Meaning of Watts and Kilowatt. A Standard of Measurement. The Ampere Standard. The Voltage Standard. The Ohm. Calculating the Voltage.

Simple Switches. A Two-Pole Switch. Double-Pole Switch. Sliding Switch. Reversing Switch. Push Buttons. p. iiiElectric Bells. How Made. How Operated. Annunciators. Burglar Alarm. Wire Circuiting. Circuiting System with Two Bells and Push Buttons. The Push Buttons, Annunciators and Bells. Wiring Up a House.

Storing Up Electricity. The Accumulator. Accumulator Plates. The Grid. The Negative Pole. Connecting Up the Plates. Charging the Cells. The Initial Charge. The Charging Current.

Mechanism in Telegraph Circuit. The Sending Key. The Sounder. Connecting Up the Key and