Pre-pulsar shuttle 47 is a period-47 shuttle oscillator discovered by David Buckingham on December 5, 1982 and was the first oscillator of that period to be discovered. It consists of four tubs, four blinkers, four eater 1s and two blocks hassling two pre-pulsars. Hassling pre-pulsars in manners similar to this had been the only known method of constructing period-47 oscillators until discovery of the Snark. In terms of its 84 cells, it is the smallest known period-47 oscillator.
In May 2003 Jason Summers found that sparks from four copies of this oscillator could be used to support a period-47 t-tetromino engine, and in February 2009 Nicolay Beluchenko noticed that this only required two copies of the oscillator, as shown below.
A 52-glider synthesis was discovered in October 2013 by Martin Grant and Matthias Merzenich for a variant of this oscillator in which the eaters are positioned differently.
Generation 4 reveals that the objects being hassled are pre-pulsars
An extended version of this oscillator, found by Jason Summers and improved by Nicolay BeluchenkoDownload RLE: click here
- 84P47.1 at Heinrich Koenig's Game of Life Object Catalogs