p61 Herschel loop 2

p61 Herschel loop 2
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Pattern type	Oscillator
Number of cells	1596
Bounding box	381 × 70
Period	61
Mod	61
Heat	762.3
Volatility	0.92
Strict volatility	0.92
Discovered by	Paul Callahan
Year of discovery	1997
Rules Outer-totalistic rules B3/S23 – B38/S23 # of rules 21 = 2 Isotropic rules B3/S23 – B38/S234c
Pattern files RLE p61herschelloop2.rle

P61 Herschel loop 2 is a period 61 Herschel loop oscillator found by Paul Callahan in February 1997, improving on Dave Buckingham's P61 Herschel loop 1 from his article My Experience with B-heptominos in Oscillators. It was the smallest oscillator of this period until the discovery of the Snark.

The original version was functionally equivalent but slightly larger than the pattern shown, due to its use of eater 2s instead of eater 5s to suppress each Herschel's first natural output glider, quickly enough to allow the next Herschel to follow 61 ticks later.

See also

• p57 Herschel loop 1
• p59 Herschel loop 1
• p59 Herschel loop 2
• p61 Herschel loop 1