How Two Boys Made Their Own Electrical Apparatus

Renew：Part 21
Author：Thomas M. St. John
Update：08-15-2023
Tags：Computers Technology
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Chapter List

Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Chapter 7
Chapter 8
Chapter 9
Chapter 10
Chapter 11
Chapter 12
Chapter 13
Chapter 14
Chapter 15
Chapter 16
Chapter VIII. A blacksmith will help you out with this. (12.) A center-punch or sharp-pointed punch for making dents in metal. A sharp-pointed wire nail will do for tin and copper. (13.) Files for metal. (14.) Some sort of a vice or clamp. (See App. 79, 80.) (15.) Shears for cutting sheet-tin, etc. A pair of old shears will do. (16.) An anvil or piece of old iron that may be used to hammer on to flatten tin, etc. An old flat-iron makes a good anvil.
Chapter I. About Frictional Electricity.--II. About Magnets and Magnetism.--III. How Electricity is Generated by the Voltaic Cell.--IV. Various Voltaic Cells.--V. About Push-b.u.t.tons, Switches and Binding-Posts.--VI. Units and Apparatus for Electrical Measurements.--VII. Chemical Effects of the Electric Current.--VIII. How Electroplating and Electrotyping are Done.--IX.
Chapter (1) Secret Writing. (2) Magic Triangles, Squares, Rectangles, Hexagons, Crosses, Circles, etc. (3) Dropped Letter and Dropped Word Puzzles. (4) Mixed Proverbs, Prose and Rhyme. (5) Word Diamonds, Squares, Triangles, and Rhomboids. (6) Numerical Enigmas. (7) Jumbled Writing and Magic Proverbs. (8) Dissected Puzzles. (9) Hidden and Concealed Words. (10) Divided Cakes, Pies, Gardens, Farms, etc. (11) Bicycle and Boat Puzzles. (12) Various Word and Letter Puzzles. (13) Puzzles with Counters. (14) Combination Puzzles. (15) Mazes and Labyrinths.
Chapter I. Toys Operated by Permanent Magnets.--II. Toys Operated by Static Electricity.--III. Making Electromagnets for Toys.--IV. Electric Batteries.--V. Circuits and Connections.--VI. Toys Operated by Electromagnets. VII. Making Solenoids for Toys.--VIII. Toys Operated by Solenoids.--IX. Electric Motors.--X. Power, Speed, and Gearing.--XI. Shafting and Bearings.--XII. Pulleys and Winding-Drums.--XIII. Belts and Cables.--XIV. Toys Operated by Electric Motors.--XV. Miscellaneous Electric Toys.--XVI. Tools.--XVII.
Chapter 21