Harlan Wade Books

Sand
Sand

By Harlan Wade

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Describes how sand may have come from the wearing away of mountains.

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Strength
Strength

By Harlan Wade

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Text and illustrations demonstrate how things can be strong on one occasion but not on another.

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Speed
Speed

By Harlan Wade

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Defines speed and compares the speed of various items.

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Springs
Springs

By Harlan Wade

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Easy-to-read text explains how the springs used in such objects as toys, clocks, and chairs, operate.

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The Wheel
The Wheel

By Harlan Wade

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A simple explanation of how a wheel works.

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Wood
Wood

By Harlan Wade

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Explains in simple terms what wood is, where it comes from, and its many uses.

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Oil
Oil

By Harlan Wade

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A simple explanation of the sources of animal, vegetable, and mineral oils and the uses we make of them.

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Gears
Gears

By Harlan Wade

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A simple explanation of gears and what they do.

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Heat
Heat

By Harlan Wade

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A simple explanation of sources and effects of heat.

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Electricity
Electricity

By Harlan Wade

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Explains the basic concept of electricity in simple terms.

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