Jack

Jack
x = 13, y = 9, rule = B3/S23 3bo5bo$3b2o3b2o$o2b2o3b2o2bo$3o2bobo2b3o$5bobo$3o2bobo2b3o$o2b2o3b2o2b o$3b2o3b2o$3bo5bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ THUMBSIZE 3 GPS 2 ZOOM 27 WIDTH 630 HEIGHT 550 LOOP 4 ]]
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Pattern type	Oscillator
Number of cells	42
Bounding box	13 × 9
Period	4 (mod: 4)
Heat	31
Volatility	0.57 | 0.10
Kinetic symmetry	+c
Discovered by	Robert Wainwright
Year of discovery	1984
Rules Outer-totalistic rules B3/S23 – B378/S023678 # of rules 26 = 64 Isotropic rules B3aijnq/S2-cn3ejr – B2in34-aitw5cikr6-i78/S0234-aqr5-ejq678
Glider synthesis Fewest gliders 19† Catagolue-generated RLE synthesis Uploaded synthesis RLE jack_synth.rle †Can be constructed with 15 gliders using the reverse caber tosser universal constructor.
Pattern files Plaintext jack.cells RLE jack.rle
Identifiers apgcode xp4_8op707po8zgoo555oogzw47074

Jack is a period-4 oscillator that was found by Robert Wainwright in April 1984. Its generations have 42, 44, 46 and 42 cells.

A 19-glider synthesis is known for this oscillator, reusing the final step of an earlier 34-glider synthesis.

x = 63, y = 63, rule = B3/S23 49bo$o48bobo10bo$b2o46b2o9b2o$2o59b2o3$37bobo$37b2o$38bo12$37b3o$37bo$ 38bo5$48b2o3b2o$47bo7bo$25bo2b2o3b2o2bo7bo4bobo4bo$25b4obobob4o7b4obob ob4o$30bobo16b2ob2o$25b4obobob4o7b4obobob4o$25bo2b2o3b2o2bo7bo4bobo4bo $47bo7bo$48b2o3b2o5$24bo$25bo$23b3o12$24bo$24b2o$23bobo3$2o59b2o$b2o9b 2o46b2o$o10bobo48bo$13bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 WIDTH 650 HEIGHT 650 THEME Book ZOOM 10 AUTOSTART GPS 12 T 0 PAUSE 1 T 20 PAUSE 3 T 89 PAUSE 1 T 98 PAUSE 2 LOOP 99 ]]

Final step of syntheses (click above to open LifeViewer)

See also

• Other jacks

External links

• Jack at the Life Lexicon
• Jack at Adam P. Goucher's Catagolue
• 22 period 4 oscillators 26 bits and larger at Mark D. Niemiec's Life Page (download pattern file: lg/42jack1.rle)