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x = 13, y = 19, rule = B3/S23 b2o6b2o$o2bo4bo2bo$o2bo4bo2bo$o2bo4bo2bo$b2o6b2o3$7bo$5bo2bob2o$6b2o2b 2o3$6b4o$5b6o$4b8o$3b2o6b2o$4b8o$5b6o$6b4o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]]
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) 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. A period 9 version that uses two snackers instead of pentadecathlons is also possible (see below), but a p14 (by hitting the sides of the pentadecathlon with 34P14 shuttles) is not possible. It is not possible to create a period 45 version by using one snacker and one pentadecathlon, however, as the sparks must be both present at the same time when hassling.

Image gallery

The period 9 version of Jolson
Download RLE: click here
One of the phases of Jolson, which led to its name

External links

  • 42P15.1 at Heinrich Koenig's Game of Life Object Catalogs
  • Al Jolson at Wikipedia