1775 in science
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The year 1775 in science and technology involved some significant events.
Biology
- The cheetah (Acinonyx jubatus) is described.<ref name="Catsg2017">Template:Cite journal</ref>
Chemistry
- May 25 – Joseph Priestley's account of his isolation of oxygen in the form of a gas ("dephlogisticated air") is read to the Royal Society of London.<ref>Template:Cite journal</ref>
- Swedish chemist Torbern Bergman's {{#invoke:Lang|lang}} ("A Dissertation on Elective Attractions") is published, containing the largest tables of chemical affinity ever published.
- Swedish chemist Carl Wilhelm Scheele produces the toxic cupric hydrogen arsenite pigment Scheele's green.<ref>Template:Cite journal</ref>
Exploration
- July 30 – 3-year second voyage of James Cook completed, the first eastabout global circumnavigation, during which the Antarctic Circle has been crossed three times, Terra Australis shown to be a myth, and Larcum Kendall's K1 chronometer demonstrated to be a reliable timekeeper for the purpose of calculating longitude.
Mathematics
- Lagrange's Recherches d'Arithmétique develops a general theory of binary quadratic forms.
- First Stanhope Demonstrator, a mechanical device to demonstrate and solve problems in logic, is produced by English aristocrat Charles Stanhope, 3rd Earl Stanhope.<ref>Template:Cite journal</ref>
Medicine
- English surgeon Percivall Pott finds the first occupational link to cancer, contributing to the science of epidemiology.
- German physician Melchior Adam Weikard anonymously publishes the textbook Der Philosophische Arzt including the earliest description of symptoms resembling attention deficit hyperactivity disorder.
Natural history
- February 21 – La Specola, Florence's Museum of Zoology and Natural History, opens to the public.
- Johan Christian Fabricius publishes his {{#invoke:Lang|lang}}.
- Peter Forsskål's {{#invoke:Lang|lang}} (containing early observations on bird migration) and {{#invoke:Lang|lang}} are published posthumously, edited by Carsten Niebuhr.<ref>{{#invoke:citation/CS1|citation
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Technology
- May 22 – James Watt's 1769 steam engine patent is extended to June 1800 by Act of Parliament of Great Britain and the first engines are built under it.<ref>Template:Cite journal</ref><ref>{{#invoke:citation/CS1|citation
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- Jacques-Constantin Périer operates a paddle steamer on the Seine, but it proves to be underpowered.<ref>Template:Cite book</ref>
- Alexander Cumming patents the S-trap in London, laying the foundations for the modern flush toilet.<ref>{{#invoke:citation/CS1|citation
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- Edinburgh confectioner Charles Spalding devises improvements to the diving bell, adding a system of balance-weights.<ref>Template:Citation</ref>
- Pierre-Simon Girard, age 10, invents a water turbine.
- December 30 – John Arnold takes out his first patent for improvements in the construction of marine chronometers in Britain, including the first for a compensation balance.<ref>No. 1113. Template:Cite ODNB</ref>
- Approximate date – Thomas Mudge invents the detached lever escapement for clocks and watches.
- French Academy of Sciences made the statement that the academy "will no longer accept or deal with proposals concerning perpetual motion."<ref>Template:Cite journal</ref>
Awards
- Copley Medal: Nevil Maskelyne<ref>{{#invoke:citation/CS1|citation
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Births
- January 22 – André-Marie Ampère, French physicist (died 1836)
- February 9 – Farkas Bolyai, Hungarian mathematician (died 1856)
- May 10 – William Phillips, English geologist (died 1828)
- July 23 – Étienne-Louis Malus, French physicist and mathematician] (died 1812)
- September 30 – Robert Adrain, Irish-born mathematician (died 1843)
- November 19 – Johann Karl Wilhelm Illiger, German entomologist and zoologist (died 1813)
- December 21 – Julien-Joseph Virey, French anthropologist, naturalist and physician (died 1846)
Deaths
- March 3 – Richard Dunthorne, English astronomer (born 1711)
- May 1 – Israel Lyons, English mathematician and botanist (born 1739; died of measles)
- October 25 – Johan Maurits Mohr, Dutch astronomer (born 1716)