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Air gap

Electricity. the space between two objects magnetically related, as between the rotor and the stator in a dynamo, or between two objects electrically related, as between the electrode and the tip of a spark plug.
Historical Examples

We want our magnet to project, as it were, its force across the greatest length of air gap.
Scientific American Supplement, No. 787, January 31, 1891 Various

An electric pressure is induced in the secondary circuit, but of not enough intensity to cause a spark to jump across the air gap.
Hawkins Electrical Guide, Number One Nehemiah Hawkins

Why is a spark produced at the air gap at break and not at make of the primary current?
Hawkins Electrical Guide, Number One Nehemiah Hawkins

In the electric bell, we saw that an air gap at the push button stopped the flow of electricity.
General Science Bertha M. Clark

A copper disc, when inserted within the air gap of the ring magnet, was brought into rapid rotation.
The inventions, researches and writings of Nikola Tesla Thomas Commerford Martin

It is simply that you thereby reduce the reluctance offered by the air gap to the flow of the magnetic lines.
Scientific American Supplement, No. 787, January 31, 1891 Various

Decreasing this air gap will cause the cutout to open late, and increasing it will cause the cutout to open early.
The Automobile Storage Battery O. A. Witte

An air gap in a magnetic circuit always tends to hasten demagnetizing.
Scientific American Supplement, No. 787, January 31, 1891 Various

In the above example we have for simplicity assumed that the flux in passing across the air gap does not spread out at all.
Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 Various

It requires a vastly higher voltage to make a spark jump across an air gap than it does to lead it across thus.
The Library of Work and Play: Electricity and Its Everyday Uses John F. Woodhull


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