Difference between revisions of "Boojum reflector"
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{{Reflector | {{Reflector | ||
''' | |name = Boojum reflector | ||
|pname = boojumreflector | |||
|type = Stable | |||
|c = 60 | |||
|bx = 44 | |||
|by = 32 | |||
|a = 180 | |||
|p = 202 | |||
|discoverer = Dave Greene | |||
|discoveryear = 2001 | |||
|plaintext = true | |||
|rle = true | |||
}} | |||
The '''boojum reflector''' is a [[reflector]] found by [[Dave Greene]] in April {{year|2001}}, winning $100 bounties offered by [[Alan Hensel]] and [[Dieter Leithner]]. The name is taken from Lewis Carroll's ''The Hunting of the Snark'', referring to the fact that a small 90-degree stable reflector was really what was wanted.{{refn|group=note|180-degree reflectors are relatively undesirable and have limited use in larger circuitry constructions because they cannot get a glider to wherever it needs to be.}} | |||
The boojum reflector was both the smallest and fastest known [[stable reflector]], until it was superceded by the [[rectifier]] in 2009 and the [[Snark]] in 2013. | |||
The boojum reflector produces an unwanted beehive, which is then deleted by a later glider. If the beehive is removed before the latter glider hits it, the glider will leave the reflector. This reaction can be seen in this p226 glider [[shuttle]]: | |||
{{EmbedViewer | |||
|pname = p226glidershuttle | |||
|position = center | |||
|viewerconfig = #C [[ AUTOSTART THUMBSIZE 2 GPS 20 LOOP 226 ]] | |||
}} | |||
==Notes== | |||
<references group="note" /> | |||
==External links== | ==External links== | ||
{{LinkLexicon|lex_b.htm#boojumreflector}} |
Revision as of 22:35, 29 December 2019
Boojum reflector | |||||||
View static image | |||||||
Pattern type | Stable reflector | ||||||
---|---|---|---|---|---|---|---|
Number of cells | 60 | ||||||
Bounding box | 44 × 32 | ||||||
Angle | 180° | ||||||
Repeat time | 202 | ||||||
Discovered by | Dave Greene | ||||||
Year of discovery | 2001 | ||||||
|
The boojum reflector is a reflector found by Dave Greene in April 2001, winning $100 bounties offered by Alan Hensel and Dieter Leithner. The name is taken from Lewis Carroll's The Hunting of the Snark, referring to the fact that a small 90-degree stable reflector was really what was wanted.[note 1]
The boojum reflector was both the smallest and fastest known stable reflector, until it was superceded by the rectifier in 2009 and the Snark in 2013.
The boojum reflector produces an unwanted beehive, which is then deleted by a later glider. If the beehive is removed before the latter glider hits it, the glider will leave the reflector. This reaction can be seen in this p226 glider shuttle:
(click above to open LifeViewer) RLE: here Plaintext: here |
Notes
- ↑ 180-degree reflectors are relatively undesirable and have limited use in larger circuitry constructions because they cannot get a glider to wherever it needs to be.
External links
- Boojum reflector at the Life Lexicon