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| D. Williamson: Scientific Toys - illustrated instructions for building various science-oriented toys which can be made by children, including a balloon buggy, bubble blower, crystal radio, elastic-powered cars, electric dice spinner, electric motor, harmonographs, homemade hovercraft, magnetic padlock, magnetic pendulum, magnetometer, printer port robot, remote controlled cars, robot arm, rotodynes, rubber-band helicopter, simple drawing instruments, toy submarine, vortex gun made from a plastic bucket, water rocket and more |
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