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{{Oscillator|p=5|name=Middleweight volcano|pname=middleweightvolcano|v=0.46|bx=13|by=13|animated=true|c=47|h=16.4|discoverer=Dean Hickerson|discoveryear=1992|life105=true|life106=true|plaintext=true|rle=true}}
{{Oscillator
'''Middleweight volcano''' is a [[period]] [[:Category:Oscillators with period 5|5]] [[oscillator]] that was found by [[:Category:Patterns found by Dean Hickerson|Dean Hickerson]] in April [[:Category:Patterns found in 1992|1992]] that produces [[spark]]s much like a [[middleweight spaceship]].
|name             = Middleweight volcano
|pname           = middleweightvolcano
|family          = Volcano
|c                = 47
|bx               = 13
|by               = 13
|p                = 5
|m                = 5
|h               = 16.4
|v                = 0.46
|symmetry        = n
|discoverer       = Dean Hickerson
|discoveryear     = 1992
|rulemin          = B3/S23
|rulemax          = B38/S237
|rulespecial      = [[Conway's Game of Life|Conway Life]]
|isorulemin      = B3-cj/S23-ay
|isorulemax      = B2in34ce5acjn6en7c8/S234-aiknr5acenq6-ac7
|synthesis        = 80
|plaintext       = true
|rle             = true
|animated        = true
|apgcode          = xp5_4aab97f79baicz32134b870vi
|pentadecathlonid = 47P5.4
|viewerconfig    = #C [[ HEIGHT 600 WIDTH 600 THUMBSIZE 3 ZOOM 30 GPS 2 LOOP 5 ]]
}}
'''Middleweight volcano''' is a {{period|5}} [[oscillator]] that was found by [[Dean Hickerson]] on April 6, {{year|1992}}<ref>{{CiteHickersonOscillators|accessdate=March 14, 2020}}</ref> that produces [[spark]]s much like a [[middleweight spaceship]]. Like the [[toaster]], its sparker [[rotor]] is stabilized by another, separate rotor encased within the oscillator. In particular, one of their shared [[bushing]] cells has no other stator neighbors, and must rely only on the two rotors for its continued survival.


==Image gallery==
[[File:MW volcano gen2.png|thumb|center|Generation 2 of middleweight volcano reveals its sparks]]
{|
|-
|[[Image:MW_volcano_gen2.png|framed|left|Generation 2 of middleweight volcano reveals its sparks]]
|}


==See also==
== Synthesis ==
*[[134P25]]
On July 7, {{year|2021}}, [[MathAndCode]] and [[Aleph]] found the final step of a synthesis.<ref name="post133140" /> Three days later, [[Extrementhusiast]] completed it using a different final step, creating an 88-glider synthesis.<ref name="post133365" /> A reduction to {{gliders|81|text=81 gliders}} was found in July 2023.<ref name="post163744" /><ref name="j4661519515" /> On June 18, {{year|2025}}, [[KtT]] lowered the cost to {{gliders|80|text=80 gliders}}.<ref name="post213447"/><ref name="j10398280332"/>
*[[Heavyweight volcano]]
*[[Toaster]]


==External links==
== Gallery ==
*[http://www.argentum.freeserve.co.uk/lex_m.htm#middleweightvolcano Middleweight volcano] at the Life Lexicon
{{gallery top}}
{{gallery item|{{EmbedViewer
|pname        = halfmiddleweightvolcano
|viewerconfig = #C [[ HEIGHT 500 WIDTH 600 THUMBSIZE 2 ZOOM 24 GPS 4 ]]
|position    = center
|caption      = A half-middleweight volcano, found by [[Noam Elkies]] on 15 March {{year|2000}}
|style        = width:300px;
|apgcode      = xp5_g8eh5u0e5he8zid4j2j4c5he2z178d54311
}}}}
{{gallery item|{{EmbedViewer
|rle          = x = 29, y = 27, rule = B3/S23
14bo$12bo3bo3$13bobo$5b2o2b4obob4o2b2o$2bo2bo2bo3b5o3bo2bo2bo$bobobob
2o11b2obobobo$o2bobo3b3o2bo2b3o3bobo2bo$4ob2o2b2obobobob2o2b2ob4o$5bo
2bo3bobobo3bo2bo$2o3bobo5bobo5bobo3b2o$bo2b2o5bobobobo5b2o2bo$bobo2bob
ob2obobob2obobo2bobo$2bobobobob4ob4obobobobo$3bo2b2o13b2o2bo$6bo15bo$
6bo15bo$6b3o2b2o3b2o2b3o$4bo2bobo2bo3bo2bobo2bo$4bo2bob2o7b2obo2bo$4b
2obobo9bobob2o$5bo3bo9bo3bo$4bob2obob2o3b2obob2obo$2b3obo2bob2o3b2obo
2bob3o$bo5b2o11b2o5bo$b2o23b2o!
|viewerconfig = #C [[ HEIGHT 500 WIDTH 600 THUMBSIZE 2 ZOOM 14 GPS 8 ]]
|position    = center
|caption      = A larger but higher-clearance mechanism
|style        = width:300px;
|apgcode      = xp5_62sg0goy08kai30f9a4z0cimkhkhb332a251tb5d9jzw66w146w698b8mka7l3vzwmmggoi6w691d1m25easfz03km2oi8dcc4l4q8bdab9cz643x1y01254c0f952
}}}}
{{gallery item|{{EmbedViewer
|rle          = x = 25, y = 26, rule = B3/S23
12bo$10bo3bo3$11bobo$3b2o2b4obob4o2b2o$3bo2bo3b5o3bo2bo$2obob2o11b2obo
b2o$2obo3b3o2bo2b3o3bob2o$3b2o2b2obobobob2o2b2o$2obo2bo3bobobo3bo2bob
2o$2obobo5bobo5bobob2o$3bo5bobobobo5bo$3bobobo2b2ob2o2bobobo$2b2ob2o
11b2ob2o$bo4bo11bo4bo$2bob3o3b2ob2o3b3obo$b2obo2bo3bobo3bo2bob2o$2bobo
3bobo3bobo3bobo$2bobo6b3o6bobo$3b2ob2o9b2ob2o$5bo3bo3b3o3bo$b3o2b4o2bo
2b4o2b3o$bo2b2o6b2o5b2o2bo$4bo2bo9bo2bo$6b2o9b2o!
|viewerconfig = #C [[ HEIGHT 500 WIDTH 600 THUMBSIZE 2 ZOOM 14 GPS 8 ]]
|position    = center
|caption      = A smaller variant of that, as used in the [[period-20 glider gun]]
|style        = width:300px;
|apgcode      = xp5_0o8bbobb88c2kmkko0eigzosarh2n021546m142hu146zv0lhallaarwrahe0346z37arh8t08gk4cdg48hfg4cz032qq3qq22685d5530e91
}}}}
{{gallery item|{{EmbedViewer
|rle          = x = 25, y = 31, rule = B3/S23
12bo$10bo3bo2$8bo7bo$11b3o$2b2o4b2ob3ob2o4b2o$bobo2b3obobobob3o2bobo$o
2bobob4o3b4obobo2bo$b3obo6bo6bob3o$8b4ob4o$3b2obo4bobo4bob2o$3bo4b3o3b
3o4bo$4b2o5b3o5b2o$b3o5b2o3b2o5b3o$o3b2o3bo2bo2bo3b2o3bo$obo2b4o2b3o2b
4o2bobo$bob2o15b2obo$3bo3b5ob5o3bo$3bo2b2o3bobo3b2o2bo$b2ob2o2bo7bo2b
2ob2o$2bo4b2o7b2o4bo$2bo6b2o3b2o6bo$3b2ob3o2bobo2b3ob2o$5bo2bo2bobo2bo
2bo$b5o2bob2ob2obo2b5o$bo2bo2b2o7b2o2bo2bo$2bo3bobo7bobo3bo$3b5o9b5o2$
2bob2o13b2obo$2b2obo13bob2o!
|viewerconfig = #C [[ HEIGHT 500 WIDTH 600 THUMBSIZE 2 ZOOM 14 GPS 8 ]]
|position    = center
|caption      = A different mechanism with a stronger spark
|style        = width:300px;
|apgcode      = xp5_ck0o4ie0o44m88q5heg8o0e9acz11078ab8fic93u1elg8g4h612oozy2raahwar0e4hehar4h40r4zgg0s2aq2u96iofgel1214hcg833z650349e0344d22bkhe1230eia6
}}}}
{{gallery bottom}}
 
== See also ==
* [[134P25]]
* [[Middleweight emulator]]
* [[Toaster]]
* [[Heavyweight volcano]]
 
== References ==
<references>
<ref name="j4661519515">{{CiteCatagolueJob|job=4661519515|date=July 15, 2023}}<!-- xs32_0bd0uiz2ll2qa26z01221 xs41_g89fg4q4gwgz129d1cjc1d59c xs40_0bd0uiz2ll2qaila4z0102543 xs46_g88ci5q4gwgz129t1cjc1d59cz2521 --></ref>
<ref name="j10398280332">{{CiteCatagolueJob|job=10398280332|date=June 19, 2025}}</ref>
<ref name="post133140">{{LinkForumThread
|format = ref
|p      = 133140
|title  = Re: Synthesising Oscillators
|author = Aleph
|date  = July 07, 2021
}}</ref>
<ref name="post133365">{{LinkForumThread
|format = ref
|p      = 133365
|title  = Re: Synthesising Oscillators
|author = Extrementhusiast
|date  = July 10, 2021
}}</ref>
<ref name="post163744">{{LinkForumThread
|format = ref
|p      = 163744
|title  = Re: Synthesising Oscillators
|author = Carson Cheng
|date  = July 16, 2023
}}</ref>
<ref name="post213447">{{LinkForumThread
|format = ref
|p      = 213447
|title  = Re: Still Life Synthesis Thread
|author = KtT
|date  = June 18, 2025
}}</ref>
</references>
 
== External links ==
* {{LinkLexicon|lex_m.htm#mwvolcano|name=MW volcano}}
* {{LinkCatagolue|xp5_4aab97f79baicz32134b870vi}}
* {{LinkPentadecathlonObject|47P5.4}}
 
{{Sparker|p=5|type=dot|strength=strong}}
__NOTOC__

Latest revision as of 20:30, 21 August 2026

Middleweight volcano
x = 13, y = 11, rule = B3/S23 4b5o$3bo5bo$b3o5b3o$o11bo$ob3obob4o$bo3b3o$3bo5b2obo$2b2obobobob2o$3bo bo2bo$3bo2b2o$2b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ HEIGHT 600 WIDTH 600 THUMBSIZE 3 ZOOM 30 GPS 2 LOOP 5 ]]
View animated image
View static image
Pattern type Oscillator
Family Volcano
Number of cells 47
Bounding box 13 × 13
Period 5 (mod: 5)
Heat 16.4
Volatility 0.46 | 0.46
Kinetic symmetry n
Discovered by Dean Hickerson
Year of discovery 1992

Middleweight volcano is a period-5 oscillator that was found by Dean Hickerson on April 6, 1992[1] that produces sparks much like a middleweight spaceship. Like the toaster, its sparker rotor is stabilized by another, separate rotor encased within the oscillator. In particular, one of their shared bushing cells has no other stator neighbors, and must rely only on the two rotors for its continued survival.

Generation 2 of middleweight volcano reveals its sparks

Synthesis

On July 7, 2021, MathAndCode and Aleph found the final step of a synthesis.[2] Three days later, Extrementhusiast completed it using a different final step, creating an 88-glider synthesis.[3] A reduction to 81 gliders was found in July 2023.[4][5] On June 18, 2025, KtT lowered the cost to 80 gliders.[6][7]

x = 14, y = 15, rule = B3/S23 6bo$4bo$8bo$3bo$b3ob2obobo$o3bo2b2ob3o$2ob2o3b2o3bo$bobo7bobo$bo2bo2b 6o$2b2o2bo$3bob2obob3o$3bo2bo4bobo$4bo3b2o3bo$5b3o2b3o$7bo2bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 500 WIDTH 600 THUMBSIZE 2 ZOOM 24 GPS 4 ]]
A half-middleweight volcano, found by Noam Elkies on 15 March 2000
(click above to open LifeViewer)
RLE: here Plaintext: here
Catagolue: here
x = 29, y = 27, rule = B3/S23 14bo$12bo3bo3$13bobo$5b2o2b4obob4o2b2o$2bo2bo2bo3b5o3bo2bo2bo$bobobob 2o11b2obobobo$o2bobo3b3o2bo2b3o3bobo2bo$4ob2o2b2obobobob2o2b2ob4o$5bo 2bo3bobobo3bo2bo$2o3bobo5bobo5bobo3b2o$bo2b2o5bobobobo5b2o2bo$bobo2bob ob2obobob2obobo2bobo$2bobobobob4ob4obobobobo$3bo2b2o13b2o2bo$6bo15bo$ 6bo15bo$6b3o2b2o3b2o2b3o$4bo2bobo2bo3bo2bobo2bo$4bo2bob2o7b2obo2bo$4b 2obobo9bobob2o$5bo3bo9bo3bo$4bob2obob2o3b2obob2obo$2b3obo2bob2o3b2obo 2bob3o$bo5b2o11b2o5bo$b2o23b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 500 WIDTH 600 THUMBSIZE 2 ZOOM 14 GPS 8 ]]
A larger but higher-clearance mechanism
(click above to open LifeViewer)
Catagolue: here
x = 25, y = 26, rule = B3/S23 12bo$10bo3bo3$11bobo$3b2o2b4obob4o2b2o$3bo2bo3b5o3bo2bo$2obob2o11b2obo b2o$2obo3b3o2bo2b3o3bob2o$3b2o2b2obobobob2o2b2o$2obo2bo3bobobo3bo2bob 2o$2obobo5bobo5bobob2o$3bo5bobobobo5bo$3bobobo2b2ob2o2bobobo$2b2ob2o 11b2ob2o$bo4bo11bo4bo$2bob3o3b2ob2o3b3obo$b2obo2bo3bobo3bo2bob2o$2bobo 3bobo3bobo3bobo$2bobo6b3o6bobo$3b2ob2o9b2ob2o$5bo3bo3b3o3bo$b3o2b4o2bo 2b4o2b3o$bo2b2o6b2o5b2o2bo$4bo2bo9bo2bo$6b2o9b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 500 WIDTH 600 THUMBSIZE 2 ZOOM 14 GPS 8 ]]
A smaller variant of that, as used in the period-20 glider gun
(click above to open LifeViewer)
Catagolue: here
x = 25, y = 31, rule = B3/S23 12bo$10bo3bo2$8bo7bo$11b3o$2b2o4b2ob3ob2o4b2o$bobo2b3obobobob3o2bobo$o 2bobob4o3b4obobo2bo$b3obo6bo6bob3o$8b4ob4o$3b2obo4bobo4bob2o$3bo4b3o3b 3o4bo$4b2o5b3o5b2o$b3o5b2o3b2o5b3o$o3b2o3bo2bo2bo3b2o3bo$obo2b4o2b3o2b 4o2bobo$bob2o15b2obo$3bo3b5ob5o3bo$3bo2b2o3bobo3b2o2bo$b2ob2o2bo7bo2b 2ob2o$2bo4b2o7b2o4bo$2bo6b2o3b2o6bo$3b2ob3o2bobo2b3ob2o$5bo2bo2bobo2bo 2bo$b5o2bob2ob2obo2b5o$bo2bo2b2o7b2o2bo2bo$2bo3bobo7bobo3bo$3b5o9b5o2$ 2bob2o13b2obo$2b2obo13bob2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 500 WIDTH 600 THUMBSIZE 2 ZOOM 14 GPS 8 ]]
A different mechanism with a stronger spark
(click above to open LifeViewer)
Catagolue: here


See also

References

  1. ↑ Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
  2. ↑ Aleph (July 07, 2021). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  3. ↑ Extrementhusiast (July 10, 2021). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  4. ↑ Carson Cheng (July 16, 2023). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  5. ↑ shinjuku (#4661519515) (July 15, 2023). Job triggered by Adam P. Goucher at GitLab Catagolue project.
  6. ↑ KtT (June 18, 2025). Re: Still Life Synthesis Thread (discussion thread) at the ConwayLife.com forums
  7. ↑ shinjuku (#10398280332) (June 19, 2025). Job triggered by Adam P. Goucher at GitLab Catagolue project.


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