By the time he was forty years old, Benjamin Franklin had made enough money in various business enterprises to live comfortably for the rest of his life. At this time he decided to devote his energy to scientific investigations. It wasn’t until he was nearly 50 years old that he began his career as a statesman. When he was experimenting with atmospheric electricity and lightning, Franklin naturally wanted to know when a charged thundercloud was approaching. He set up the alarm shown here. Briefly explain how it worked.

By the time he was forty years old, Benjamin Franklin had made enough money in various business enterprises to live comfortably for the rest of his life. At this time he decided to devote his energy to scientific investigations. It wasn’t until he was nearly 50 years old that he began his career as a statesman. When he was experimenting with atmospheric electricity and lightning, Franklin naturally wanted to know when a charged thundercloud was approaching. He set up the alarm shown here. Briefly explain how it worked.

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