What tool was used to do measure the depths of the ocean? •What are the 2 pieces of equipment used to collect bottom samples on the Challenger? •What was a newly invented piece of equipment used on the Challenger ship to get water samples called?

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Electroscope is the instrument that has the ability to detect the presence of an electric charge. Although electroscope has the power to measure the amount of charge, but for a perfect measurement the electrometer is used. Around the year 1600, electroscope was discovered by William Gilbert he British physician. This is a pretty primitive but highly effective instrument in regards to detecting the presence of electric charges. Two basic but effective electroscopes are the gold-leaf electroscope and the pith-ball electroscope. 

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