Period-24 glider gun
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|True period 24 gun|
|View static image|
|Number of cells||335|
|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. 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.
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. The period 48 gun is shown below using the reduced variant form. A smaller p48 gun was found in 2016 by Tanner Jacobi, using Rich's p16 to double the period.