Editing 1913 in science (section)

==Technology==
* April 29 – [[Swedish American]] engineer [[Gideon Sundback]] of [[Hoboken, New Jersey]], [[patent]]s the all-purpose [[zipper]].
* May 26 (May 13 [[Old Style and New Style dates|O.S.]]) – [[Igor Sikorsky]] flies the world's first 4-engine [[fixed-wing aircraft]], his [[Sikorsky Russky Vityaz|Bolshoi Baltisky]] [[biplane]], near [[Saint Petersburg]].<ref>{{cite book|url=https://books.google.com/books?id=eE-trX3XZawC&q=Bolshoi+Baltisky&pg=PA27|title=The Sikorsky Legacy|page=27|first=Sergei I.|last=Sikorsky|publisher=Arcadia Publishing|location=Charleston, South Carolina|year=2007|isbn=978-0-7385-4995-8|accessdate=2012-05-12}}</ref><ref>{{cite book|chapter=Sikorsky, Igor|title=Encyclopedia of World Scientists|editor=Oakes, Elizabeth H.|edition=Rev.|publisher=Infobase Publishing|year=2007|page=667}}</ref>
* August – Invention of [[stainless steel]] by [[Harry Brearley]] in [[Sheffield]], England (concurrent with the invention of another type in the United States by [[Elwood Haynes]]).<ref name="Pocket On This Day">{{cite book|title=Penguin Pocket On This Day|publisher=Penguin Reference Library|isbn=0-14-102715-0|year=2006|pages=94}}</ref>
* [[Oskar Barnack]] of [[Ernst Leitz GmbH|Leitz]] produces the first [[35mm format|35 mm film]] miniature still camera.
* The [[Kaplan turbine]] is invented by [[Viktor Kaplan]].<ref>{{cite news|url=http://nla.gov.au/nla.news-article230792075|title=New Austrian Stamps|newspaper=[[The Sun (Sydney)|The Sun]]|issue=1765|location=Sydney|date=24 January 1937|access-date=10 March 2017|page=13|via=National Library of Australia}}</ref>
* French inventor [[René Lorin]] patents the [[ramjet]], but attempts to build a prototype fail due to inadequate materials.<ref>{{cite book|last1=Zucker|first1=Robert D.|first2=Oscar|last2=Biblarz|title=Fundamentals of Gas Dynamics|publisher=Wiley|year=2002|isbn=0-471-05967-6}}</ref>