Adjustable Clean c/4 Glider Rake
Some recently-discovered c/4 diagonal spaceships include accessible sparks, which can be used to make alterations to other active or stable patterns in passing. Recent discoveries include alterations that reflect gliders 180 degrees, or convert a single glider into multiple gliders -- along with a c/4 wickstretcher with a wick that can be ignited by gliders, where the resulting fuse can be timed to burn out without harming the wickstretcher engine.
David Bell has used these results to complete an adjustable clean c/4 rake, with periods of the form 4508+32N. Bell's description follows:
The rake has an engine convoy at the front, two convoys forming lines behind that, and a V-shaped convoy at the back. The recipe to create the next rake in the series is:
Move the top line convoy orthogonally right by 6 cells. Move the left line convoy orthogonally down by 6 cells. Move the V-shaped convoy diagonally back by 6 cells.
This will increase the period by 32 generations.
The modifications can be be made in the opposite direction to form the earlier rakes in the series. Moving the convoys by 300 cells creates the first rake in the series, having the period 4508.
New Period 7 Oscillators
More new c/4 Diagonal Spaceships
Tomas Rokicki has announced the release of a new version of Golly, the cross platform Game of Life program written by him and Andrew Trevorrow. From his announcement:
The important changes:
- Saves patterns (RLE or macrocell formats).
- Displays comments in pattern files.
- Windows app can read gzipped pattern files.
- Simple cell selection and editing.
- Scrolling via hand cursor.
- New tool bar buttons.
- Numerous bug fixes and interface improvements.
The distribution now includes a pattern collection (still under development). Many of the current patterns show off Golly's hashing capabilities.
(Disclaimer— I have no association with anyone or any organization, and speak only for myself. Links and quotes are provided for information only.)