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#C A period 30 pre-pulsar shuttle oscillator found in August 1980 x = 18, y = 11, rule = B3/S23 bo14bo$obo4bo7bobo$bo3b2ob2o6bo$7bo4$7bo$bo3b2ob2o6bo$obo4bo7bobo$bo 14bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 6 LOOP 30 THUMBSIZE 3 WIDTH 600 HEIGHT 480 ]]
Pattern type Oscillator
Oscillator type Shuttle
Number of cells 28
Bounding box 18×15
Period 30
Mod 15
Heat 22.4
Volatility 0.91
Strict volatility 0.91
Discovered by David Buckingham
Year of discovery 1980

Eureka (or p30 pre-pulsar shuttle) is a period-30 pre-pulsar shuttle oscillator in which two 15-generation pre-pulsar shuttle mechanisms each composed of two tubs hassle a pre-pulsar. It was found by David Buckingham on August 16, 1980.[1] A slightly different period-30 shuttle can be created by shifting the top half of the shuttle two cells to the left or right (see below). This allows the outermost tubs to optionally be replaced by blocks.

The first known semi-natural appearance of a version of this oscillator was in November 2014 in a soup found by Adam P. Goucher using apgsearch.[2] The monomerized version first occurred in March 2016.[3]

Image gallery

Generation 1 of Eureka, which shows that the object being hassled is a pre-pulsar
A skewed variant of Eureka with one tub replaced by a block
Download RLE: click here


  1. Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
  2. Adam P. Goucher (November 25, 2014). Re: Soup search results (discussion thread) at the forums
  3. Aidan F. Pierce (March 20, 2016). Re: Soup search results (discussion thread) at the forums

External links

  • 28P30.1 at Heinrich Koenig's Game of Life Object Catalogs