The first known artificial refrigeration was demonstrated by William Cullen at the University of Glasgow in 1748. However, he did not use his discovery for any practical purpose. In 1805, an American inventor, Oliver Evans, designed the first refrigeration machine. The first practical refrigerating machine was built by Jacob Perkins in 1834; it used ether in a vapor compression cycle. An American physician, John Gorrie, built a refrigerator based on Oliver Evans' design in 1844 to make ice to cool the air for his yellow fever patients. German engineer Carl von Linden, patented not a refrigerator but the process of liquifying gas in 1876 that is part of basic refrigeration technology. Note: Improved refrigerator designs were patented by African American inventors, Thomas Elkins (11/4/1879 U.S. patent #221,222) and John Standard (7/14/1891 U.S. patent #455,891).
James Bolsover(1850-1931), was the inventor of soap
1850
the inventor of the tripod stand was golbert mathews in 1850 january 8
William Sturgeon was the first inventor to create electromagnets. He was an English inventor who lived from 1783 to 1850 CE.
Lawrence Hargrave (1850-1915)Australian aviation pioneer, inventor, explorer, mason, and astronomer
elisha was American and was the actual inventor of the elevator break in 1850
I own an original 1850 Springfield rifle used in the civil war! It has the bayonet as well on the end of the Rifle extending its length an extra 2 feet or so.
In 1850, the United States Congress passes the Fugitive Slave Law, or Fugitive Slave Act. It was a part of the Compromise of 1850. It forced all runaway slaves to come back to their original masters.
The burglar alarm was invented by a Boston inventor Augustus Pope in 1850 and developed commercially by Edwin Holmes and Thomas Watson. Their version was patented in 1858.
5% of 1850= 5% * 1850= 0.05 * 1850= 92.5
25% of 1850= 25% * 1850= 0.25 * 1850= 462.5
99.4% of 1850= 99.4% * 1850= 0.994 * 1850= 1838.9