ansion.

VIII. HOW DRAUGHTING BECOMES A VALUABLE AID Page 95

Lines in Drawing. Shading. Direction of Shade. Perspectives. The Most
Pronounced Lines. Direction of Light. Scale Drawings. Degree, and What
it Means. Memorizing Angles. Section Lining. Making Ellipses and
Irregular Curves. Focal Points. Isometric and Perspective. The
Protractor. Suggestions in Drawing. Holding the Pen. Inks. Tracing
Cloth. Detail Paper. How to Proceed. Indicating Material by Section
Lines.

IX. TREATMENT AND USE OF METALS Page 112

Annealing. Toughness and Elasticity. The Process. Tempering. Tempering
Contrasted with Annealing. Materials Used. Gradual Tempering. Fluxing.
Uniting Metals. Alloying Method. Welding. Sweating. Welding Compounds.
Oxidation. Soldering. Soft Solder. Hard Solder. Spelter. Soldering
Acid. The Soldering Iron.

X. ON GEARING, AND HOW ORDERED Page 121

Spur and Pinion. Measuring a Gear. Pitch. Diametral Pitch. Circular
Pitch. 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 Pr