John Henry Holmes was born in England in 1857. He invented the lightswitch in 1884. Light switches make it easier to turn lights on or off. They can immediately turn lights on or off. William J. Newton turned Holmes' invention into the toggle switch. The simple but important invention, there are many different types of switches.
William Jenny was born in Massachusetts in 1832. He learned how to be an engineer in France. He fought in the Civil War for the North. He got married in 1867. They had two children. He invented the skyscraper in 1884, after a discussion with his wife. Elevators were very important to skyscrapers. A strong foundation keeps it safe during earthquakes. More are built every year.
Washing dishes by hand is hard work. The scullery room was used for washing dishes. It was made to get wet. It was hard work for restaurants to clean all those dirty dishes. Josephine Cochrane was born in Ohio in 1839. She had a sister named Irene. She got married in 1850 to a business owner. She hosted large parties on china. She wanted an easier way to clean dishes. She invented the dishwasher in 1886. It cleans dirty dishes. She sold them to her friends first. It was shown off at the World's Fair in Chicago in 1843.
Henrich Hersch was born in Germany in 1857. He studied engineering with Helm Holtz in Berlin. He proved the existence of electromagnetic waves in 1887. They can carry information. They are useful in the medical field. He didn't think they would be useful. He died at 36 years old. Others picked up his work.
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