|View static image|
|Number of cells||1239|
|Discovered by||David Bell|
|Year of discovery||2005|
Moving sawtooth is an orthogonal sawtooth with expansion factor 3 that was found by David Bell on July 10, 2005. Its minimum infinite repeating population is 1239, and it is notable because it and its slight modifications are the only known sawtooths that move.
The pattern works by using the output of c/3 rakes to ignite the blinkers from a blinker puffer 1 (which moves at c/2), with the number of blinkers to be consumed growing in each cycle. Once ignited, the blinker fuse burns at 2c/3.
The number of alive cells plotted versus the number of elapsed generations roughly forms an ever-increasing sawtooth graph.