True period 24 gun

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True period 24 gun
True period 24 gun image
Pattern type Gun
Number of cells 335
Bounding box 43×32
Period 24
Barrels 1
Discovered by Noam Elkies
Year of discovery 1997

True period 24 gun is a true period 24 gun discovered by Noam D. Elkies in 1997.[1] It uses four large period 4 oscillators (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]

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]

Image gallery

Original period 24 glider gun.
Period 48 glider gun.

See also

Period-20 glider gun


  1. 1.0 1.1 Paul Callahan (February 11, 2001). "p24 "true" gun (mail digest)". Retrieved on March 17, 2016.
  2. Jason Summers (December 30, 2012). "Pattern Collections, jslife/osc". Retrieved on March 17, 2016.
  3. Tanner Jacobi (2016-07-05). "Re: Soup search results". forums. Retrieved on 2016-07-05.