p44 pi-heptomino hassler

P44 pi-heptomino hassler is a period-44 oscillator discovered by David Buckingham on April 2, 1992.[1] It was improved to the form shown here by Noam Elkies in April 1996. The oscillator consists of two pi-heptominos being hassled by two heavyweight emulators and four blocks.

p44 pi-heptomino hassler
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Pattern type Oscillator
Number of cells 102
Bounding box 31×44
Period 44
Mod 44
Heat 93.3
Volatility 0.91
Strict volatility 0.80
Discovered by David Buckingham
Year of discovery 1992

Buckingham used two copies of this oscillator to make the first period 44 glider gun. This became obsolete in October 1996 when Buckingham found a gun that only used one copy of the oscillator.

In 1994 Dean Hickerson found a way to double the oscillator's period by adding two molds, creating the first period 88 oscillator. David Buckingham also found a way to triple the period before August 1994.

The original form of this oscillator
RLE: here
Buckingham's original period 44 gun and its subsequent improvement, as well as the small period-44 MWSS gun found by Dietrich Leithner
Download RLE: click here
The first period 88 oscillator
RLE: here
The first period 132 oscillator
RLE: here
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See also
  • Mold on 36P22
  • p50 pi-heptomino hassler

References
  1. Dean Hickerson's oscillator stamp collection.
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