Blinkers and Buzzers

by Bernie Zubrowski
Publisher: Morrow Junior Books
Hardcover, 111 pages
Used Price: $8.00 (1 in stock) Condition Policy

Traffic lights, telegraphs, and burglar alarms are just a few of the exciting battery-powered models that can be built from this involving book. Fifty creative experiments show how and why these devices work while providing hours of hands-on learning fun.

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