The top documents of frederick-j
Mechanical Combination of Colours
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A Simple Dynamo
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The Bursting of a Pressure-Gauge
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A Simple Heat Engine
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The Nickel Heat Engine
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A Periodic Mercury Pump
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A Magnetic Screen
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The Penetrative Power of Bullets
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Bullet-Proof Shields
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Conductorless X-Ray Bulbs and Tubes
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Resources on a plate
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The ore deposit—tectonics connection
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