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Alexander Graham Bell
|
Andrew Dunn |
Examines the life and accomplishments of the speech teacher whose study of sound and the human voice led to his invention of the telephone. |
OL2681783W |
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Bridges
|
Andrew Dunn |
Explores the methods and materials used in building bridges, as well as the environmental impact of bridge building. Includes some projects. |
OL2681785W |
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Fog, mist, and smog
|
Andrew Dunn |
Discusses fog, mist, and smog and the conditions which create them. |
OL2681791W |
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It’s electric
|
Andrew Dunn |
Explains the scientific principles behind electricity, discussing such aspects as static, circuits, batteries, and generators. |
OL2681797W |
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The power of pressure
|
Andrew Dunn |
Explains how air and water pressure work and how they are used in machines. |
OL2681803W |
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Tunnels
|
Andrew Dunn |
Discusses the function and design of tunnels, their impact on the environment, benefits, drawbacks, and future. |
OL2681809W |
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Wheels at work
|
Andrew Dunn |
An introduction to wheels and how they are used in machines. |
OL2681811W |
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Lifting By Levers
|
Andrew Dunn |
Describes simples machines which utilize the principle of levers to move heavy objects, cut material, and make music. |
OL2681814W |
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Simple Slopes
|
Andrew Dunn |
Describes how simple machines utilize the principle of the slope or incline to plow fields, unlock doors, and lift heavy loads. |
OL2681815W |