Herschel stopper

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Herschel stopper
x = 94, y = 58, rule = B3/S23 43bo$41b3o34b2o$17bo22bo26bo10bo$17b3o20b2o25b3o9bo$20bo49bo7b2o$19b2o 48b2o2$o49bo$3o47b3o$3bo49bo$2b2o11b2o11bo23b2o11b2o11bo$15b2o9b3o36b 2o9b3o$26bo49bo$26bo49bo15b2o$92b2o3$bo49bo$bobo47bobo$b3o36b2o9b3o$3b o23b2o11b2o11bo23b2o$28bo49bo$25b3o47b3o$25bo49bo2$44b2o$45bo$15b2o25b 3o20b2o$15bo26bo22bo$16b3o47b3o$18bo49bo25$28bo$28b2o$27bobo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ ZOOM 14 X 18 Y -13 GPS 20 LOOP 261 PAUSE 2 WIDTH 480 HEIGHT 480 THUMBSIZE 2 T 77 PAUSE 2 T 154 PAUSE 2 T 260 PAUSE 2 ]]
Pattern type Conduit
Conduit type Stable
Input glider
Output boat
Number of cells 6
Bounding box 2×4
Discovered by Dean Hickerson
Year of discovery 1996

A Herschel stopper is a method of cleanly suppressing a Herschel signal with an asynchronous boat-bit, discovered by Dean Hickerson in November 1996. In the infobox pattern, a ghost Herschel marks the location of output signal if the boat-bit is not present. The first Herschel travels through the conduit unaffected, but after the glider produces a boat-bit, the next Herschel collides with the boat and the two are mutually annihilated without affecting any of the nearby catalysts. Other boat-bit locations that allow for clean suppression of a Herschel are also known.

The term "Herschel stopper" is also occasionally used to refer to any mechanism that cleanly suppresses a Herschel. These are usually stable conduits that allow the Herschel's first natural glider to escape, so they are more commonly classified as converters. See SW-2.

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