Editing 1918 in science (section)

==Technology==
* April 10 – [[Alexander M. Nicholson]] files a United States patent for the [[radio crystal oscillator]].<ref>Nicholson, Alexander M. ''Generating and transmitting electric currents'' {{US patent|2212845}}, granted August 27, 1940.</ref>
* July – American cinematographer [[Frank D. Williams (cinematographer)|Frank D. Williams]] is granted a patent for the "[[Williams process]]" of travelling [[Matte (filmmaking)|matte]].<ref>{{US patent|1273435}}.</ref>
* [[Edwin Howard Armstrong]] develops the [[superheterodyne receiver]].<ref name=WCBN>{{cite web|title=Radio/Broadcasting Timeline|work=CBN History|publisher=WCBN|url=http://www.wcbn.org/history/wcbntime.html|access-date=2019-10-23|archive-date=2022-03-01|archive-url=https://web.archive.org/web/20220301024429/http://www.wcbn.org/history/wcbntime.html|url-status=dead}}</ref>
* [[George Constantinescu]] publishes ''[[Theory of sonics]]: a treatise on transmission of power by vibrations'',<ref>London: The Admiralty.</ref> originating the study of this branch of [[continuum mechanics]].
* [[Theodore von Karman]] and [[Asbóth Oszkár]] build the first co-axial [[helicopter]].
* [[Charles Strite]] invents the [[pop-up toaster]].<ref>{{US patent|1394450}}, granted October 18, 1921.</ref>