Practical Mechanics for Boys | Page 2

How to Order a Gear. Bevel and Miter Gears. Drawing Gears.
Sprocket Wheels.
XI. MECHANICAL POWER Page 128
The Lever. Wrong Inferences from Use of Lever. The Lever Principle.
Powers vs. Distance Traveled. Power vs. Loss of Time.
Wrongly-Directed Energy. The Lever and the Pulley. Sources of Power.
Water Power. Calculating Fuel Energy. The Pressure or Head. Fuels.
Power from Winds. Speed of Wind and Pressure. Varying Degrees of
Pressure. Power from Waves and Tides. A Profitable Field.
XII. ON MEASURES Page 139
Horse Power. Foot Pounds. Energy. How to Find Out the Power
Developed. The Test. Calculations. The Foot Measure. Weight. The
Gallon. The Metric System. Basis of Measurement. Metrical Table,
Showing Measurements in Feet and Inches.
XIII. USEFUL INFORMATION FOR THE WORKSHOP Page 148
Finding the Circumference of a Circle. Diameter of a Circle. Area of a
Circle. Area of a Triangle. Surface of a Ball. Solidity of a Sphere.
Contents of a Cone. Capacity of a Pipe. Capacity of Tanks. To
Toughen Aluminum. Amalgams. Prevent Boiler Scaling. Diamond Test.
Making Glue Insoluble in Water. Taking Glaze Out of Grindstone. To
Find Speeds of Pulleys. To Find the Diameters Required. To Prevent
Belts from Slipping. Removing Boiler Scale. Gold Bronze. Cleaning
Rusted Utensils. To Prevent Plaster of Paris from Setting Quickly. The
Measurement of Liquids with Spoons.
XIV. SIMPLICITY OF GREAT INVENTIONS AND OF NATURE'S

MANIFESTATION Page 152
Invention Precedes Science. Simplicity in Inventions. The Telegraph.
Telephone. Transmitter. Phonograph. Wireless Telegraphy. Printing
Telegraph. Electric Motor. Explosions. Vibrations in Nature. Qualities
of Sound. The Photographer's Plate. Quadruplex Telegraphy. Electric
Harmony. Odors. Odophone. A Bouquet of Vibrations. Taste. Color.
XV. WORKSHOP RECIPES AND FORMULAS Page 160
Adhesives for Various Uses. Belt Glue. Cements. Transparent Cement.
U. S. Government Gum. To Make Different Alloys. Bell-metal. Brass.
Bronzes. Boiler Compounds. Celluloid. Clay Mixture for Forges.
Modeling Clay. Fluids for Cleaning Clothes, Furniture, etc.
Disinfectants. Deodorants. Emery for Lapping Purposes. Explosives.
Fulminates. Files, and How to Keep Clean. Renewing Files. Fire-proof
Materials or Substances. Floor Dressings. Stains. Foot Powders. Frost
Bites. Glass. To Frost. How to Distinguish. Iron and Steel. To Soften
Castings. Lacquers. For Aluminum and Brass. Copper. Lubricants.
Paper. Photography. Plasters. Plating, Coloring Metals. Polishes. Putty.
Rust Preventives. Solders. Soldering Fluxes. Steel Tempering.
Varnishes. Sealing Wax.
XVI. HANDY TABLES Page 178
Table of Weights for Round and Square Steel. Table of Weight of Flat
Steel Bars. Avoirdupois Weight. Troy Weight. Apothecaries' Weight.
Linear Measure. Long Measure. Square Measure. Solid or Cubic
Measure. Dry Measure. Liquid Measure. Paper Measure. Table of
Temperatures. Strength of Various Metals. Freezing Mixtures. Ignition
Temperatures. Power and Heat Equivalents.
XVII. INVENTIONS AND PATENTS, AND INFORMATION
ABOUT THE RIGHTS AND DUTIES OF INVENTORS AND
WORKMEN, Page 188
The Machinist's Opportunities. What is an Inventor? Idea Not Invention.
What an Invention Must Have. Obligation of the Model Builder.

Paying for Developing Devices. Time for Filing an Application. Selling
an Unpatented Invention. Joint Inventors. Joint Owners Not Partners.
Partnerships in Patents. Form of Protection Issued by the Government.
Life of a Patent. Interference Proceedings. Concurrent Applications.
Granting Interference. Steps in Interference. First Sketches. First Model.
First Operative Machine. Preliminary Statements. Proving Invention.
What Patents Are Issued For. Owner's Rights. Divided and Undivided
Patents. Assignments. How Made. What an Invention Must Have.
Basis for Granting Patent in the United States. Reasons for Granting
Abroad. Original Grants of Patents. International Agreement.
Application for Patents. Course of Procedure. Costs. Filing a Matter of
Secrecy.

LIST OF ILLUSTRATIONS
FIG. PAGE 1. Bench vise 8 2. Pipe grip for vise 9 3. Swivel vise 10 4.
Speed lathe 11 5. Calipers 12 6. Engine lathe 13 7. Center gage 14 8.
Pocket screw and wire gage 15 9. Handy bench vise 16 10.
Combination square 17 11. Uses of the combination square 18 12. A
quick adjusting micrometer 19 13. Universal bevel protractor 20 14.
Uses of universal bevel protractor 21 15. Grindstone truing device 22
16. Set of tools and case 23 17. The work bench 24 18. Hook tool 28 19.
Parting tool 28 20. Knife tool 28 21. Right-hand side tool 28 22.
Internal tool 28 23. Left-hand side tool 28 24. Tool for wrought iron 29
25. Tool for cast iron 29 26. End view of drill 31 27. Side view of drill
31 28. Hack-saw frame 35 29. Hack-saw blade 35 30. Plain hook tool
38 31. Plain straight tool 38 32. Proper angles for tools 39 33. Angles
for tools 39 34. Angles for tools 39 35. Set of the bitt 40 36. Correct
angle 41 37. Wrong angle 41 38. Too low 42 39. Improper set 42 40.
Internal set 43 41. Set for brass 43 42. Surface gage 44 43. Uses of
surface gage 46 44. Rounded surface 49 45. Winding surface 49 46.
Hexagon nut 51 47.