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...in the Balling scale and introduced the [[Brix]] scale. In the early 1900s German chemist [[Fritz Plato]] (1858-1938) and his collaborators made further impr In mid-19th century England, the use of letter "X" and other ones had evolved into a standardiz ...

In the 19th and 20th centuries, [[Russia]] produced many notable [[List of Russian scie At the start of the 18th century the [[Reforms of Peter I of Russia|reforms of Peter the Great]] (founder of ...

...th-century English—an overview |url=https://public.oed.com/blog/nineteenth-century-english-an-overview/ |access-date=7 November 2020 |website=Oxford English D ...st=Badash |first=Lawrence |date=1972 |title=The completeness of nineteenth-century science |url=https://www.journals.uchicago.edu/doi/pdfplus/10.1086/350840 | ...

...|Columba]] is a small, faint [[constellation]] named in the late sixteenth century. Its name is [[Latin]] for [[dove]]. It is located just south of [[Canis Ma ...aint constellation in the [[southern sky]], first defined in the late 16th century. Its name means "no feet" in Greek, and it represents a [[bird-of-paradise] ...

[[Nuclear fission]] was discovered in December 1938 by chemists [[Otto Hahn]] and [[Fritz Strassmann]] and physicists [[Lise Meitner]] and In the last years of the 19th century, scientists frequently experimented with the [[cathode-ray tube]], which by ...

...actions. The system became the standard of France and Europe within half a century. Other measures with unity ratios<ref group="Note">ratios of 1 between mag ...ts for length, mass and time. Advances in [[electromagnetism]] in the 19th century necessitated additional units to be defined, and multiple incompatible syst ...

...ermodynamic work, the caloric theory was, around the end of the eighteenth century, replaced by the "mechanical" theory of heat, which is accepted today. === 17th century–early 18th century === ...

...ysics)|period]] of [[Cepheid]] [[variable stars]] at the beginning of 20th century. ...chemistry: their changing roles from alchemical times to the mid-twentieth century|last=F.|first=Rayner-Canham, Marelene|date=1998|publisher=American Chemical ...

...ved to Boreham Road, Warminster, where houses were built in the early 19th century.{{R|"Warminster and Westbury Journal 11 July 1903"|"Wiltshire Times 9 Augus ...ere attending the County School.{{R|"Wiltshire Times 28 November 1914"}} [[German invasion of Belgium (1914)|Germany had invaded Belgium]] on 4{{Nbsp}}August ...

..., who made extensive use of this special case of Taylor series in the 18th century.}} ...'''[[Mass number]]'''}}{{defn|defn=The mass number (symbol ''A'', from the German word ''Atomgewicht'' [atomic weight]),<ref>[[Jensen, William B.]] (2005). T ...