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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 theContinue reading “History 05 Lesson 45”
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 andContinue reading “History 05 Lesson 40”
History 05 Lesson 30
Platform scale- Who invented it? Thaddeus Fairbanks. When was it invented? 1857. Where was it invented? Johnsbury, Vermont. How does it work? A platform scale is a scale that measures the weight of objects loaded on a flat platform. The function of the platform is to transmit the weight of the object to the internal measuringContinue reading “History 05 Lesson 30”
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