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London sinks were originally shallower than Belfast sinks. [5] One plumbing guide in 1921 suggested that the Belfast sink was 38 centimetres (15 in) deep.) [ 7 ] Some believe this was because London had less access to fresh water (and thus a greater need to conserve water), but this theory is now contested.
1974: The lithium-ion battery is invented by M. Stanley Whittingham, and further developed in the 1980s and 1990s by John B. Goodenough, Rachid Yazami and Akira Yoshino. It has impacted modern consumer electronics and electric vehicles. [508] 1974: The Rubik's cube is invented by Ernő Rubik which went on to be the best selling puzzle ever. [509]
The form comes with two worksheets, one to calculate exemptions, and another to calculate the effects of other income (second job, spouse's job). The bottom number in each worksheet is used to fill out two if the lines in the main W4 form. The main form is filed with the employer, and the worksheets are discarded or held by the employee.
At first, the heavier solids were channeled into ditches on the side of the farm and were covered over when full, but soon flat-bottomed tanks were employed as reservoirs for the sewage; the earliest patent was taken out by William Higgs in 1846 for "tanks or reservoirs in which the contents of sewers and drains from cities, towns and villages ...
1025 - Musical notes were invented by Guido of Arezzo, named UT, RE, MI, FA, SO and LA. Later in the 16th century UT was changed to DO and TI was added. Lines/staves to space printed notes were also added. 1250 - Rounds, songs sung in harmony, were invented; the first known example is the song Sumer is icumen in.
Iron working appears to have been invented by the Hittites in about 1200 BC, beginning the Iron Age. The secret of extracting and working iron was a key factor in the success of the Philistines. [8] [17]
There were examples of this in the Balkans—and in aristocratic families. However, the typical pattern in Western Europe was the much simpler nuclear family of husband, wife and their children (and perhaps a servant, who might well be a relative). Children were often temporarily sent off as servants to relatives in need of help. [2]
Marion O'Brien Donovan (October 15, 1917 – November 4, 1998) was an American inventor and entrepreneur.Recognized as one of the era's most prominent female inventors, [1] she secured a total of 20 patents for her creations.