One of the mysteries of the English language finally explained.
A mnemonic concerning the behaviour of a current-carrying conductor in a magnetic field, according to which the directions of the magnetic field, the current, and the force exerted on the conductor are indicated respectively by the first finger, second finger, and thumb of the left hand when these are held out perpendicular to each other.
1920s: proposed by J. A. Fleming (see Fleming, Sir John Ambrose).
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