Josephine Cochrane (1839–1913) was fond of throwing dinner parties in her mansion in Illinois. Heirloom china was washed by servants who were very careless at times. Once she cried out in despair: "If nobody else is going to invent a dish washing machine, I'll do it myself!" She built wire compartments, each specially designed to fit different size dishes. The compartments were placed inside a wheel that lay flat inside a copper boiler. A motor turned the wheel while hot soapy water squirted up from the bottom of the boiler. That was the first dishwasher to use water pressure instead of scrubbers for cleaning the dishes. After receiving a patent on December 28, 1886 Josephine Cochrane showed her invention at the 1893 World’s Columbian Exposition in Chicago and won the highest prize.
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