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1900s
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diagram directions due earths engineering equal field galvanometer has illustration instrument made magnetic magnets movingmagnet nearly needles opposite opposition point possible reference restoring resultant same sensitive showing small stable suspended their them two type very vintageVintage Diagram Of A Broca Galvanometer Stock Illustration
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Vintage diagram of a Broca Galvanometer #250584586
Description
Vintage illustration diagram showing a Broca Galvanometer. A very sensitive type of *galvanometer that is a *moving-magnet instrument. It has two magnetic needles, NS and Nââ¬Â²Sââ¬Â², made as nearly equal as possible and suspended on the same axis in opposition. When the magnets are deflected from their stable point the restoring couples on them due to the earthââ¬â¢s magnetic field act in opposite directions with a very small resultant couple. 1900s reference to engineering.
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