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Measures for Progress: A History of the National Bureau of Standards

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The <strong>of</strong> <strong>the</strong> magnetic fluid clutch is based on creating a magnetic field that<br />

causes iron particles suspended in oil to become highly viscous and grab toge<strong>the</strong>r into<br />

an almost solid mass.<br />

in <strong>the</strong> magnetic clutch this oil.and-iron fluid is contained between steel plates. The<br />

plates, which operate independently in <strong>the</strong> absence <strong>of</strong> electric current, lock toge<strong>the</strong>r<br />

when <strong>the</strong> current flows into <strong>the</strong> fluid.<br />

The model car, above, demonstrates <strong>the</strong> possible use <strong>of</strong> <strong>the</strong> principle in automotive<br />

vehicles, where two <strong>of</strong> <strong>the</strong> magnetic clutches, with suitable gearing, provide <strong>the</strong> main<br />

power transmission.<br />

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