Editing 1905 in science (section)

==Technology==
* January 17 – Samuel J. Bens of San Francisco is granted the earliest patent for a practical "[[Chainsaw|endless chain saw]]" for felling trees.<ref>{{cite web|url=https://patents.google.com/patent/US893897A/en|title=Endless chain saw|accessdate=2018-09-21}}</ref>
* October – First [[bascule bridge]] to the design of [[Joseph Strauss (engineer)|Joseph Strauss]] opened, in Cleveland, Ohio.<ref>{{cite journal|title=Joseph B. Strauss Bascule Bridge|first=Frank|last=Griggs|journal=Structure|url=https://www.structuremag.org/article/joseph-b-strauss-bascule-bridge/|accessdate=2024-10-27}}</ref>
* [[Canal Lake Concrete Arch Bridge]] built in [[Ontario]].
* [[Pathé Frères]] colorise black-and-white films by machine.
* [[Alfred Buchi]] files a patent for the [[turbocharger]].
* [[Paul de Vivie]] invents a two-speed rear-wheel [[derailleur gear]] for [[bicycle]]s.<ref>{{cite web|url=http://cycling.ahands.org/bicycling/velocio.html|title=Velocio, Grand Seigneur|first=Clifford L.|last=Graves|work=The Best of Bicycling |accessdate=2012-05-24 |date=May 1965}}</ref>
* [[Pipe (car)|Pipe]] manufactures the first [[automobile]] with a [[hemi engine]].
* [[Walter Griffiths (inventor)|Walter Griffiths]] invents a manually powered domestic [[vacuum cleaner]].
* [[Reginald Fessenden]] invents the [[superheterodyne receiver]].<ref>{{cite book|last=Nahin|first=Paul J.|title=The Science of Radio|location=New York|publisher=AIP Press|edition=2nd|year=2001|page=91|isbn=0-387-95150-4}}</ref>
* [[Marconi]] invents the [[directional antenna]].<ref>{{cite web|title=Radio/Broadcasting Timeline|work=CBN History|publisher=WCBN|url=http://www.wcbn.org/history/wcbntime.html|accessdate=2019-10-22|archive-date=2022-03-01|archive-url=https://web.archive.org/web/20220301024429/http://www.wcbn.org/history/wcbntime.html|url-status=dead}}</ref>