| 21. | The galvanometer is an early instrument used to measure the strength of an electric current.
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| 22. | In 1826, Poggendorff developed the mirror galvanometer, a device for detecting electric currents.
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| 23. | A Faraday disk can also be operated with neither a galvanometer nor a return path.
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| 24. | At the very top was the galvanometer.
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| 25. | His research included investigating galvanometers and electricity.
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| 26. | Mirror galvanometers were used extensively in scientific instruments before reliable, stable electronic amplifiers were available.
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| 27. | Stewart measured radiated power with a thermo-pile and sensitive galvanometer read with a microscope.
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| 28. | The vibration galvanometer is used for detecting alternating currents in the frequency of its natural resonance.
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| 29. | The old brass and wood instruments, with such odd names as galvanometer, remain perfectly undisturbed.
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| 30. | The resulting induction current was transmitted through two wires to the receiver, consisting of a galvanometer.
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