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 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] The eater 1 can be replaced with a unix for compacting purposes, such as in earlier versions of the period-48 glider gun.

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

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]

In January 2019 a smaller period-24 gun was assembled by Tanner Jacobi and Matthias Merzenich, based on the dueling banjos oscillator[4] (see animation below). It was further reduced in November of that same year due to the discovery of a new p6 domino sparker by Dongook Lee.[5] Both of these variants have been used to create period-48 LWSS guns,[6][7] and the former gun was in turn used to create a pseudo-period 16 glider gun.[8]

Original period 24 glider gun.
Period 48 glider gun.
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A p24 LWSS gun, used in broken lines.
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RLE: here Plaintext: here
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A smaller p24 gun based on dueling banjos.
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RLE: here Plaintext: here
<html><div class="rle"><div class="codebox"><div style="display:none;"><code></html>x = 69, y = 66, rule = B3/S23 10b2ob2o15b2ob2o$10b2obo5bo5bo5bob2o$13bo4b2o5b2o4bo$13b2o2bo9bo2b2o$ 18b2obobob2o$8bobo8b3ob3o11b2o$6b3ob3o23bobo$5bo7bo22b3o$6bob6o21bo$6b 2o4bo5bo7bo7bob4o$8bo3b2o3b4o3b4o4b2obo4bo$7bobo2bobo2bo3bobo3bo3bobob ob2obob3o$8bo2bo6bo2bobo2bo4b3obob2obobobo$11bo3bo2b3o3b3o8bo4bob2o$ 11bo3bo20b4obo6b2ob2o3b2ob2o$11bo28bo6bo5bobo5bo$11bo2bo22b3o12b2ob2o$ 12bo24bobo10bo7bo$10bobobo22b2o8bo2bob2ob2obo2bo$9bobob2o14bo18bo3bo3b o3bo$9bobo6b5o7bo18b2ob2ob2ob2o$10b2o4b3obob3o3b3o19bo2bobo2bo$15bo4bo 4bo25bobobobo$15bob2o2bob2obo25bo3bo$16bo2b2o3bobo$17b2o2bo2bob2o7bo$ 12b2o5bo4bobo2bo6bo$8b2obobo5b4ob2o2b2o4b3o3bo2bo20bo2bo$9bobo11bo20bo 23bo$9bobo7b2o2bo16bo3bo19bo3bo$8b2o3bob2obob3o7b2o9b4o20b4o$7bo3b4obo bo12b2o$8b3o3bo3bob3o7bo$11b4ob2o2bo2bo$8b2obo8bobo12b2o14b2o$7bobo2bo 2b5obo12b2o14bobo$2o5bo3bo3bo4bo3b2o10bo13bo$2o6b3o6b3o5b2o17b2o2b2ob 4o$10bob4obo6bo19bo2bobo4bo$4o7b6o29b2obob2o2b2o$o2bo8b4o25b2o4bobo3b 2o2bo$26b2o12b2o5bobob2o2b2obo$18b2o7bo14bo5bo4bo4bo$6b3o10b2o4bo23b3o bob3o4b2o$4bo3b2o8bo4b4o12bo11b2ob2o6bobo$4bobo2b2o11bo4bo5bo4bobo18b 2obobo$3bo5bo11bob5o5b3o2bobo6b2o10bobobo$4b5o12bo6b2o6bobob2o4b2o13bo $20b2obobobo2bo2b2obobo3bo5bo5bo5b2o$4b5o11bo2bobobob2o2bo4b2ob3o11bo 3b3o$3bo5bo11b2obo2bo6b3o4b3o10b2o3b3o$4bobo2b2o9bo3bob2ob2o2b2obo4b3o 10bo4b3o$4bo3b2o10b2obobo3bo4bobobo2b3o4bo10b3o3bo$6b3o12bobo2b2o2b3ob ob2obo2bo4bobo10b2o2bobo$21bo2bobo8bo4b2o22bo2bo$22b2o2bo3b4obob2obo 20bo$o2bo14b2o6b2o2bo2bobobo2bo20b6obo$4o3b2o10bo14bo3b2o8bo5bo5bo7bo$ 6bo3b9o28b3o3b3o5b3ob3o$2o4bobob7o2b3o24bo2b2ob2o2bo6bobo$2o3b2ob2o2b 4o2bo2bo21b2o13b2o$8bo2bo7b2o21bo6b2ob2o6bo$5b2obobobo29bob2o11b2obo$ 6bo4bo27b2obo5b2o3b2o5bob2o$6bob3o28b2ob2o5bo3bo5b2ob2o$7b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART GPS 12 LOOP 48 THUMBLAUNCH THUMBSIZE 2 THEME 6 ZOOM 6 WIDTH 480 HEIGHT 480 ]]<html></code></div></div><canvas width="200" height="300" style="margin-left:1px;"><noscript></html>
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A p48 LWSS gun, using Rich's p16 and 44P12.3.
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RLE: here Plaintext: here
gollark: It's called a top level coroutine override.
gollark: Small ones.
gollark: Or Anavrins, briefly.
gollark: Basically, that allows PotatOS to check that the code on the disk was written by someone with access to the master private key (i.e. me).]
gollark: Asymmetric cryptography.

See also

References
  1. Paul Callahan (February 11, 2001). "p24 "true" gun (mail digest)". Retrieved on March 17, 2016.
  2. Jason Summers' jslife pattern collection. Retrieved on March 17, 2016.
  3. Tanner Jacobi (2016-07-05). "Re: Soup search results". ConwayLife.com forums. Retrieved on 2016-07-05.
  4. Matthias Merzenich (January 13, 2019). Re: Execution of Old Guns by Variable-Speed Firing Squad (discussion thread) at the ConwayLife.com forums
  5. Matthias Merzenich (November 10, 2019). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
  6. Matthias Merzenich (January 14, 2019). Re: Execution of Old Guns by Variable-Speed Firing Squad (discussion thread) at the ConwayLife.com forums
  7. BlinkerSpawn (November 10, 2019). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
  8. Chris Cain (January 15, 2019). Re: Execution of Old Guns by Variable-Speed Firing Squad (discussion thread) at the ConwayLife.com forums
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