Difference between revisions of "Switch engine"
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__NOTOC__{{Methuselah|name=Switch engine|bx=6|by=4|pname=switchengine|c=8|l=3911|discoverer=Charles Corderman|discoveryear=1971|life105=true|life106=true|plaintext=true|rle=true}} | |||
http://www. | A '''switch engine''' (or '''Corder engine'''<ref>{{cite web|url=http://www.argentum.freeserve.co.uk/lex_c.htm#corderengine |title=Corder engine |work=The Life Lexicon |publisher=Stephen Silver |accessdate=June 10, 2009}}</ref>) is a [[methuselah]] that was found by [[Charles Corderman]] in [[:Category:Patterns found in 1971|1971]]. It produces a copy of itself after 48 generation, glide-reflected 4 cells northwest (in the case of the starting configuration shown to the right), along with some active junk. If left unattended, the accumulating exhaust overtakes and destroys the engine after 24 cycles, but it can be stabilized to make [[:Category:Spaceships with speed c/12|c/12]] diagonal [[puffer]]s and [[spaceship]]s. | ||
There are two basic types of stabilized switch engine, both of which were also found by Charles Corderman: the [[period]] 288 [[block-laying switch engine]] (the more common of the two) and period 384 [[glider-producing switch engine]]. These two puffers are the most natural [[infinite growth]] patterns in [[Conway's Game of Life|Life]], being the only ones ever seen to occur from [[soup|random starting patterns]]. | |||
Because the switch engine lends itself so naturally to infinitely-growing patterns, it appears in many of the smallest known superlinear growth patterns, including the [[mosquito]]es, [[catacryst]], [[metacatacryst]], [[Gotts dots]], and [[26-cell quadratic growth]]. | |||
In addition to the puffers based on a single switch engine, puffers such as [[Noah's ark]] can be created by combining two switch engines. Such puffers are generally quite [[dirty]]. By combining even more switch engines, it is possible to create [[Cordership]]s, which move at [[:Category:Spaceships with speed c/12|c/12]] diagonally and are thus the slowest known spaceships in Life other than [[Gemini|Geminoids]]. Such spaceships can be constructed by combining as few as [[3-engine Cordership|three]] switch engines. | |||
==Stable pattern== | |||
The stable pattern that results from the switch engine has 842 [[cell]]s. It consists of 60 [[block]]s, 33 [[beehive]]s (including one [[honey farm]]), 50 [[blinker]]s (including eight [[traffic light]]s), 12 [[glider]]s, 11 [[boat]]s, 11 [[loaf|loaves]], four [[ship]]s, two [[long boat]]s, two [[pond]]s, and two [[tub]]s. | |||
{| | |||
|- | |||
|[[Image:Switchengine_final.png|thumb|left|Generation 3911]] | |||
|} | |||
==See also== | |||
*[[Ark]] | |||
*[[Cordership]] | |||
*[[Infinite growth]] | |||
*[[Time bomb]] | |||
==References== | |||
<references /> | |||
==External links== | |||
{{LinkWeisstein|SwitchEngine.html}} | |||
{{LinkLexicon|lex_s.htm#switchengine}} | |||
*[http://www.calcyman.co.uk/life/corder.htm Corderships and Switch Engines] at [http://www.calcyman.co.uk/ www.calcyman.co.uk] | |||
[[Category:Puffer engines]] | |||
Revision as of 20:00, 5 June 2012
| Switch engine | |||||||
| View static image | |||||||
| Pattern type | Methuselah | ||||||
|---|---|---|---|---|---|---|---|
| Number of cells | 8 | ||||||
| Bounding box | 6 × 4 | ||||||
| Lifespan | 3911 generations | ||||||
| L/I | 488.9 | ||||||
| Discovered by | Charles Corderman | ||||||
| Year of discovery | 1971 | ||||||
| |||||||
A switch engine (or Corder engine[1]) is a methuselah that was found by Charles Corderman in 1971. It produces a copy of itself after 48 generation, glide-reflected 4 cells northwest (in the case of the starting configuration shown to the right), along with some active junk. If left unattended, the accumulating exhaust overtakes and destroys the engine after 24 cycles, but it can be stabilized to make c/12 diagonal puffers and spaceships.
There are two basic types of stabilized switch engine, both of which were also found by Charles Corderman: the period 288 block-laying switch engine (the more common of the two) and period 384 glider-producing switch engine. These two puffers are the most natural infinite growth patterns in Life, being the only ones ever seen to occur from random starting patterns.
Because the switch engine lends itself so naturally to infinitely-growing patterns, it appears in many of the smallest known superlinear growth patterns, including the mosquitoes, catacryst, metacatacryst, Gotts dots, and 26-cell quadratic growth.
In addition to the puffers based on a single switch engine, puffers such as Noah's ark can be created by combining two switch engines. Such puffers are generally quite dirty. By combining even more switch engines, it is possible to create Corderships, which move at c/12 diagonally and are thus the slowest known spaceships in Life other than Geminoids. Such spaceships can be constructed by combining as few as three switch engines.
Stable pattern
The stable pattern that results from the switch engine has 842 cells. It consists of 60 blocks, 33 beehives (including one honey farm), 50 blinkers (including eight traffic lights), 12 gliders, 11 boats, 11 loaves, four ships, two long boats, two ponds, and two tubs.
See also
References
- ↑ "Corder engine". The Life Lexicon. Stephen Silver. Retrieved on June 10, 2009.