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History 05 Lesson 45

Steel Plow- Who invented it? John Deere. When was it invented? 1833. Where was it invented? Grand Decatur, Illinois. How does it work? The plow consists of a bladelike plowshare that cuts into the soil to begin to prepare it for planting. As it cuts a furrow, lifts it up, turns over, and breaks up the…

History 05 Lesson 40

Electromechanical Relay- Who invented it? Joseph Henry did. When was it invented? In 1835. Where was it invented? It was invented at the College of New Jersey. How does it work? Relays control one electrical circuit by opening and closing contacts in another circuit. Why is it important? So that we have light switches and…

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