Fumarole
| Fumarole | |||||||||
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| Pattern type | Oscillator | ||||||||
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| Number of cells | 18 | ||||||||
| Bounding box | 8 × 7 | ||||||||
| Period | 5 (mod: 5) | ||||||||
| Heat | 12.8 | ||||||||
| Volatility | 0.72 | 0.72 | ||||||||
| Kinetic symmetry | Unspecified | ||||||||
| Discovered by | Dean Hickerson | ||||||||
| Year of discovery | 1989 | ||||||||
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Fumarole is a period 5 oscillator that was found by Dean Hickerson in September 1989. In terms of its 18 cells it is the fourth smallest period 5 oscillator, after pseudo-barberpole, octagon 2, and Silver's p5; however, its 7×8 bounding box is the smallest of any known period 5 oscillator. The domino spark that it provides makes it useful in the construction of higher period oscillators such as the p35 beehive hassler, p40 B-heptomino shuttle, and 98P25. On September 1, 1995, Noam Elkies found a way to non-trivially combine two fumaroles and a blinker into a period 10 oscillator, shown below;[1] 4 can be combined in a similar fashion. In February 2000 Stephen Silver found a 7-glider synthesis of this oscillator.[2]
Image gallery
 RLE: here |
See also
References
- ↑ x-oscs-new-p001-019.lif pattern collection
- ↑ Jason Summers' jslife pattern collection.
External links
- Fumarole at the Life Lexicon
Categories:
- Patterns
- Oscillators with 18 cells
- Periodic objects with minimum population 18
- Patterns with 18 cells
- Patterns found by Dean Hickerson
- Patterns found in 1989
- Patterns that can be constructed with 7 gliders
- Oscillators
- Oscillators with period 5
- Oscillators with mod 5
- Oscillators with heat 12
- Oscillators with volatility 0.72
- Oscillators with strict volatility 0.72
- Patterns with bilateral orthogonal symmetry
- Sparking oscillators
- Domino sparkers