Editing Trampoline (section)

===First modern trampolines===
The first modern trampoline was built by [[George Nissen]] and [[Larry Griswold]] in 1936.<ref>[https://web.archive.org/web/20121006232916/http://www.wvtc.co.uk/history3.htm WestView Trampoline Community site – Trampoline History p. 3]</ref> Nissen was a [[gymnastics]] and [[Diving (sport)|diving]] competitor and Griswold was a [[Tumbling (gymnastics)|tumbler]] on the gymnastics team, both at the [[University of Iowa]], United States. They had observed [[trapeze]] artists using a tight net to add entertainment value to their performance and experimented by stretching a piece of canvas, in which they had inserted grommets along each side, to an angle iron frame by means of coiled springs. It was initially used to train tumblers but soon became popular in its own right. Nissen explained that the name came from the [[Spanish language|Spanish]] ''trampolín'', meaning a [[springboard|diving board]]. Nissen had heard the word on a demonstration tour in [[Mexico]] in the late 1930s and decided to use an anglicized form as the trademark for the apparatus.<ref>{{cite web|url=http://web.mit.edu/invent/iow/nissen.html|title=Inventor of the Week Archive – George Nissen|access-date=April 13, 2007|date=March 2004|publisher=Massachusetts Institute of Technology, MIT School of Engineering|archive-url=https://web.archive.org/web/20070630114013/http://web.mit.edu/invent/iow/nissen.html|archive-date=June 30, 2007|url-status=live|df=mdy-all}}</ref>

In 1942, Griswold and Nissen created the Griswold-Nissen Trampoline & Tumbling Company, and began making trampolines commercially in [[Cedar Rapids, Iowa]].

The generic term for the trademarked trampoline was a ''rebound tumbler''<ref name=rebound_tumbler>{{cite book|url=https://books.google.com/books?id=s85tbw_N6hcC&q=%22rebound+tumbler%22&pg=PA125|title=A Sportswriter's Life: From the Desk of a New York Times Reporter|first=Gerald|last=Eskenazi|date=May 3, 2018|publisher=University of Missouri Press|isbn=9780826262608|access-date=May 3, 2018|via=Google Books}}</ref> and the sport began as ''rebound tumbling''. It has since lost its trademark and has become a [[List of generic and genericized trademarks|generic trademark]].<ref>{{cite web|url= https://www.cnbc.com/2011/02/17/Surprising-Generic-Terms-That-Were-Once-Trademarks.html|title=Surprising Generic Terms That Were Once Trademarks|first=Colleen|last=Kane|date=February 17, 2011|website=CNBC|access-date=March 8, 2024|archive-url= https://web.archive.org/web/20231226172326/https://www.cnbc.com/2011/02/17/Surprising-Generic-Terms-That-Were-Once-Trademarks.html|archive-date=December 26, 2023}}</ref>

[[Image:Spaceball.jpg|thumb|1968 demonstration of Spaceball]]
Early in their development Nissen anticipated trampolines being used in a number of recreational areas, including those involving more than one participant on the same trampoline. One such game was Spaceball{{mdash}}a game of two teams of two, or played between two individuals, on a single trampoline with specially constructed end "walls" and a middle "wall" through which a ball could be propelled to hit a target on the other side's end wall. Spaceball was created by Nissen together with [[Scott Carpenter]] and was used in space training at NASA.<ref>{{cite web | url = http://www.brentwoodtc.org/history.htm | title = Trampoline history | url-status = live | archive-url = https://web.archive.org/web/20100610013557/http://www.brentwoodtc.org/history.htm | archive-date = June 10, 2010 | df = mdy-all }}</ref><ref>{{cite web |title=How the Trampoline Came to Be |url=https://www.smithsonianmag.com/innovation/how-trampoline-came-be-180974343/ |website=Smithsonian Magazine |access-date=14 June 2023}}</ref>