| 1. | Abraham Darby first used Curie discovered piezoelectricity in Rochelle salt circa 1880.
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| 2. | His early experiments employed Rochelle salt crystals as transducers.
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| 3. | He wrote several papers on Rochelle salts.
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| 4. | The medium is usually a piezoelectric crystal such as quartz, tourmaline, or Rochelle salt.
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| 5. | Rochelle salt is deliquescent so any transducers based on the material deteriorated if stored in damp conditions.
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| 6. | Larger crystals of Rochelle salt have been grown under conditions of reduced gravity and convection on board Skylab.
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| 7. | In 1824, Sir David Brewster demonstrated piezoelectric effects using Rochelle salts, which led to him naming the effect pyroelectricity.
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| 8. | The passive hydrophones of the Imperial Japanese Navy were based on moving coil design, Rochelle salt piezo transducers, and carbon microphones.
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| 9. | The British used a Rochelle salt microphone and a piezoelectric device to trigger a relay to detonate the projectile or bomb's explosive.
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| 10. | Known as Fehling's solution it is a solution of copper sulfate mixed with alkali and potassium sodium tartrate ( Rochelle salt ).
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