The first electroscope, a pivoted needle called​

versorium

The first electroscope was a pivoted needle (called the versorium), invented by British physician William Gilbert around 1600. The pith-ball electroscope and the gold-leaf electroscope are two classical types of electroscope that are still used in physics education to demonstrate the principles of electrostatics.

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relationship between pressure and air volume and led to the understanding of how respiration works; i believe this is the correct answer ; /// good luck