1. Computer — 2023-10-09 23:40:16

   …discussed the principles of a calculating engine in a letter to Sir Humphry Davy in 1822. ===Difference Engine=== The 1820s saw Babbage work on his '**Difference Engine**', a machine which could perform mathematical calculations. A six-wheele…

2. Rubber — 2021-08-12 20:24:10

   …r an effective waterproofing agent for coaches, drivers, and passengers drew Hancock's attention to rubber. In '''April 1820''' he patented India-rubber springs for various types of clothing such as gloves and '''suspenders'''. The Hancock brot…
   …hers then started an "elastic works" to manufacture items using the rubber springs. == Mastication == In 1820 Hancock invented his most important device: the '''rubber masticator'''. He designed a machine with revolving teeth tha…
   …or softer rubber articles. == Many uses == Hancock was granted a total of '''16 patents''' relating to rubber between 1820 and 1847. In 1822 he developed rubber tubing that could be cut into '''rubber bands''' and '''life-belt tubes'''. He de…

3. Colgate — 2021-08-11 11:43:11

   …g soap, candles, and starch. After several years of financial struggle, **William Colgate & Company ** prospered in the 1820s selling Windsor toilet soaps and Pearl starch. Thirteen years after his death in 1857, the company began selling tooth…

4. Nature Reserve — 2021-08-09 22:30:53

   …te="3 June 1782" birth_place="Walton Hall, Wakefield" death_date="27 May 1865" death_place="" }} === Charles Waterton 1820 === ~- [[Society]]:[[1800s]] {{toc}} In the 1820s Waterton, an English naturalist and explorer, built a nine-foot-high …

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