Jolson
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Jolson  
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Pattern type  Oscillator  

Number of cells  42  
Bounding box  18×22  
Period  15  
Mod  15  
Heat  47.9  
Volatility  0.98  
Strict volatility  0.98  
Discovered by  Robert Wainwright  
Year of discovery  1984  
 
 
 

Jolson (also known as Al Jolson^{[note 1]}) is a period 15 oscillator consisting of two blocks hassled by two pentadecathlons. It was found by Robert Wainwright in November 1984 and named by Bill Gosper.
The hassling mechanism requires two domino sparks, constantly 3 generations apart, provided by sparkers of period 9 or above (e.g. Merzenich's p31). A period 9 version that uses two snackers is possible (see below), but p14 (with tetradecathlons) is impossible.^{[1]}
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Notes
References
 ↑ Mark Niemiec. Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
External links
 Jolson at the Life Lexicon
 42P15.1 at Heinrich Koenig's Game of Life Object Catalogs
Categories:
 Patterns
 Oscillators with 42 cells
 Patterns with 42 cells
 Patterns found by Robert Wainwright
 Patterns found in 1984
 Patterns that can be constructed with 13 gliders
 Oscillators
 Periodic objects with minimum population 42
 Oscillators with period 15
 Oscillators with mod 15
 Oscillators with heat 47
 Oscillators with volatility 0.98
 Oscillators with strict volatility 0.98