Space rake: Difference between revisions
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Apple Bottom (talk | contribs) Since it's not clear who found this, mention it was probably Bill in the text, but don't pollute the template/category tree. |
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{{Puffer| | {{Puffer | ||
'''Space rake''' is a [[period]] 20 forward [[glider]] [[rake]] constructed | |name = Space rake | ||
|pname = spacerake | |||
|type = Rake | |||
|c = 65 | |||
|bx = 22 | |||
|by = 19 | |||
|dir = Orthogonal | |||
|p = 20 | |||
|s = c/2 | |||
|rulemin = B3/S23 | |||
|rulemax = B38/S238 | |||
|rulespecial = [[Conway's Game of Life|Conway Life]] | |||
|isorulemin = B3-k/S23-y | |||
|isorulemax = B34e5ck6cn8/S234ce5ekr6i8 | |||
|plaintext = true | |||
|rle = true | |||
|animated = true | |||
|viewerconfig = #C [[ HEIGHT 380 WIDTH 600 THUMBSIZE 2 ZOOM 14 AUTOSTART OFF ]] | |||
}} | |||
'''Space rake''' is a [[period]] 20 forward [[glider]] [[rake]] constructed no later than {{year|1971}},<ref>{{CiteLifeline|vol=3|pages=page 7}}</ref> probably by [[Bill Gosper]]; it was the first known rake. It consists of an [[ecologist]] with a [[lightweight spaceship]] added to turn its dying debris into gliders. | |||
Note that if the back lightweight spaceship is flipped vertically and moved down by one [[cell]], then this becomes a period 20 backward glider rake, as shown below.<ref>[[Alan Hensel]]'s [http://www.ibiblio.org/lifepatterns/ lifep.zip] pattern collection.</ref> | Note that if the back lightweight spaceship is flipped vertically and moved down by one [[cell]], then this becomes a period 20 backward glider rake, as shown below.<ref>[[Alan Hensel]]'s [http://www.ibiblio.org/lifepatterns/ lifep.zip] pattern collection.</ref> | ||
{{EmbedViewer | |||
{ | |pname = backwardspacerake | ||
| | |viewerconfig = #C [[ HEIGHT 380 WIDTH 600 THUMBSIZE 2 ZOOM 14 ]] | ||
|[[ | |position = center | ||
|caption = The backward version of the space rake | |||
|style = width:300px; | |||
}} | |||
==References== | ==References== | ||
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==External links== | ==External links== | ||
* {{LinkLexicon|lex_s.htm#spacerake}} | |||
{{LinkLexicon|lex_s.htm#spacerake}} | |||
Latest revision as of 04:46, 20 May 2023
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| Pattern type | Rake Puffer | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Number of cells | 65 | ||||||||
| Bounding box | 22 × 19 | ||||||||
| Direction | Orthogonal | ||||||||
| Period | 20 | ||||||||
| Speed | c/2 | ||||||||
| Discovered by | Unknown | ||||||||
| Year of discovery | Unknown | ||||||||
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Space rake is a period 20 forward glider rake constructed no later than 1971,[1] probably by Bill Gosper; it was the first known rake. It consists of an ecologist with a lightweight spaceship added to turn its dying debris into gliders.
Note that if the back lightweight spaceship is flipped vertically and moved down by one cell, then this becomes a period 20 backward glider rake, as shown below.[2]
| The backward version of the space rake (click above to open LifeViewer) RLE: here Plaintext: here |
References
- ↑ Robert Wainwright (September 1971). Lifeline, vol 3, page 7.
- ↑ Alan Hensel's lifep.zip pattern collection.
External links
- Space rake at the Life Lexicon