Period-40 glider gun

Period-40 glider gun
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View static image
Pattern type	Gun
Number of cells	2416
Bounding box	226 × 220
Period	40
Barrels	1
Discovered by	Adam P. Goucher Matthias Merzenich Jason Summers
Year of discovery	2013
Rules Outer-totalistic rules B3/S23 only # of rules 20 = 1 Isotropic rules B3/S23 – B3/S234c
Pattern files RLE period40glidergun.rle

Period-40 glider gun is an extensible true period-40 glider gun discovered by Adam P. Goucher in 2013 and improved by Matthias Merzenich. It is based on a glider-releasing wick found by Jason Summers and Matthias Merzenich. It can be made to have more than 1 barrel.

A chain of honey farm precursors is hassled by figure eights and period-5 oscillators to produce 11 streams of gliders. One stream is the output, 4 are reflected to stabilize the ends of the honey farm chain, and the other 6 are absorbed by eater 1s.

A smaller version of the gun with a 165×136 bounding box was found by Luka Okanishi in April 2018.

The unrelated mechanism of using a blocker to filter the output of the period-20 glider gun yields a much smaller true period-40 gun, so this wick-based gun is of interest mainly for historical reasons.

Image gallery

Animation of period-40 gun