{{Gun|p=24|name=True period 24 gun|pname=trueperiod24gun|c=335|bx=43|by=32|discoverer=Noam Elkies|discoveryear=1997|nofile=true}}
{{Gun
'''True period 24 gun''' is the first [[Gun#True-period_guns|true period]] 24 [[gun]] to be discovered. It was discovered by [[Noam Elkies|Noam D. Elkies]] in [[:Category:Patterns found in 1997|1997]]. It uses three large [[period]] [[:Category:oscillators with period 4|4]] [[oscillator]]s to hassle two [[t-tetrominoes]], which react together to produce gliders.
|name = Period-24 glider gun
|pname = trueperiod24gun
|c = 335
|bx = 43
|by = 32
|p = 24
|b = 1
|discoverer = Noam Elkies
|discoveryear = 1997
|plaintext = true
|rle = true
|viewerconfig = #C [[ ZOOM 8 AUTOSTART OFF ]]
}}
'''Period-24 glider gun''' is a [[Gun#True-period_guns|true period]] 24 [[gun]] discovered by [[Noam Elkies|Noam D. Elkies]] in [[:Category:Patterns found in 1997|1997]].<ref name="callahan">{{cite web|url=http://www.radicaleye.com/lifepage/patterns/p24gun/p24gun.html|title=p24 "true" gun (mail digest)|author=Paul Callahan|date=February 11, 2001|accessdate=March 17, 2016}}</ref> It uses four large [[period]] [[:Category:oscillators with period 4|4]] [[oscillator]]s (two of them variants of [[fountain]], the other two adjoined by common [[casing]]) to hassle two [[T-tetromino]]s, which react together to produce gliders. The form on the right is a reduced variant found by Karel Suhajda.<ref name="jslife">{{cite web|url=http://entropymine.com/jason/life/|title=Pattern Collections, jslife/osc |author=Jason Summers|date=December 30, 2012|accessdate=March 17, 2016}}</ref> The eater 1 can be replaced with a [[unix]] for compacting purposes, such as in earlier versions of the [[period-48 glider gun]].
No more than five days after the initial discovery, Elkies found a method to double the period of the gun, resulting in the first known period 48 glider gun.<ref name="callahan" /> A smaller version was found in 2016 by Tanner Jacobi, using [[Rich's p16]] to double the period.<ref name="jacobi">{{cite web|title=Re: Soup search results|author=Tanner Jacobi|date=2016-07-05|accessdate=2016-07-05|work=ConwayLife.com forums|url=http://www.conwaylife.com/forums/viewtopic.php?f=2&t=1452&start=1075#p32769}}</ref>
In early 2019 a smaller period-24 gun was [http://www.conwaylife.com/forums/viewtopic.php?p=67805#p67805 assembled by Tanner Jacobi and Matthias Merzenich], based on the [[dueling banjos]] oscillator (see animation below).
==Gallery==
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|[[Image:Period24glidergun(original).png|framed|left|Original period 24 glider gun.]]
Period-24 glider gun is a true period 24 gun discovered by Noam D. Elkies in 1997.[1] It uses four large period4oscillators (two of them variants of fountain, the other two adjoined by common casing) to hassle two T-tetrominos, which react together to produce gliders. The form on the right is a reduced variant found by Karel Suhajda.[2] The eater 1 can be replaced with a unix for compacting purposes, such as in earlier versions of the period-48 glider gun.
No more than five days after the initial discovery, Elkies found a method to double the period of the gun, resulting in the first known period 48 glider gun.[1] A smaller version was found in 2016 by Tanner Jacobi, using Rich's p16 to double the period.[3]