Inventors and Inventions and so onЗавантажити презентацію
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By 1880, more than 4 000 washing devices had been patented. In 1861 came the wringer, an exciting new feature that did away with having to work so hard at squeezing the water out of the clothes.
In 1900 came the next huge leap in washing machine‘s development – the wooden tubs were replaced by metal ones. After that came washing machines that included drive belts, and this made it possible to add steam or gasoline engines.
The first electric-powered washing machine was invented by Alva J. Fisher in 1908. However, these machines did not become widely used until 1947-1950.
This is one of the new type of automatic washing machines which incorporated full wash, rinsing and spin cycles and was extremely successful in the 1960s.
The Hoover 'Keymatic' featured a novel means of programming the machine by using the 'keycard' to select the wash programme. This model 3224 was introduced in 1961.
Mr. Blackstone was also a merchant so he built some more washing «machines» and started selling them for $2.50 each.
Jakob or Jakob Christian Schäffer Schäffern(30 May 1718 – 5 January 1790) was a German dean, professor, botanist, mycologist, entomologist, ornithologist and inventor.