A galvanometer is basically a very sensitive ammeter that moves — it can also be used as a very precise electro-mechanical actuator, for say, moving a tiny mirror.

The galvanometer, first invented in 1802, was a means of detecting electric current. It consisted of a needle that was deflected by the magnetic field that electric current created; a stronger ...

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Figure 3. A “newer” galvanometer, circa 1880. Without going into the haggling involved with my procuring the galvanometer in Figure 1, let's just say the antique vendor wasn't knowledgeable about ...

In your bone stock panel meter, a small coil moves a needle to display whatever you’re measuring. In a mirror galvanometer, a coil twists a wire that is connected to a mirror.

Wilhelm Weber (1804-1891), a German physicist, introduced a new tangent galvanometer in 1839. Joseph Henry, the physicist who served as founding Secretary of the Smithsonian, bought this example for ...

The film explores the concept of electricity, demonstrating how it can be generated through simple experiments such as rubbing different materials together. It explains the basics of electric ...

This article was originally published with the title “Protected Galvanometer” in SA Supplements Vol. 60 No. 1556supp (October 1905), p. 24928 doi:10.1038 ...

THE use of the rectifier photo-cell to amplify galvanometer deflections is now well known; but I have never seen any explicit mention of the fact that, with the customary set-up 1, the deflections ...

The tangent galvanometer still holds its own in the testing-room for simple tests; and the lineman's detector is still indispensable on the score of its portability.

This article was originally published with the title “New Recording Galvanometer” in Scientific American Magazine Vol. 43 No. 18 (October 1880), p. 271 doi:10. ...