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