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x = 41, y = 36, rule = B3/S23 2bo$obo$b2o10$25bo$23b3o$22bo$22b2o$7b2o$8bo$8bob2o$9bo2bo23bo$10b2o 24bo$25b2o9b3o$25b2o11bo4$34bo3b2o$33bobo3bo$32bobo3bo$28b2obobo3bo$ 28b2obo2b4obo$32bobo3bobo$28b2ob2o2bo2bobo$29bobo2b2o3bo$17b2o10bobo$ 17b2o11bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ THUMBNAIL THUMBSIZE 2 X 4 Y 7 Z 16 WIDTH 600 HEIGHT 480 GPS 20 AUTOSTART PAUSE 2 T 165 PAUSE 2 LOOP 166 ]]
Pattern type Conduit
Conduit type Converter
Input Glider
Output Herschel
Number of cells 66
Bounding box 24×34
Step Unknown
Recovery time
(ignoring FNG if any)
78 ticks
Minimum overclock period
(ignoring FNG if any)
74 ticks
Spartan? No
Discovered by Tanner Jacobi
Year of discovery 2015

The syringe is a glider-to-Herschel converter discovered by Tanner Jacobi on March 19, 2015.[1] It is composed of an eater 1, a block, a beehive with tail, and a large welded still life that combines an eater 2 and an eater 5. It works by converting a bait block into a pi, then hassling the pi into a B-heptomino that restores the bait block over the course of its evolution. The eater 1 can be placed in any of the three possible orientations.

Its repeat time is 78, but it can also "overclock" to function with glider streams of period 74 or 75. Jeremy Tan, who coined the term 'syringe' to describe how it injects a glider into a Herschel system, observed that attempting to overclock the intermediate periods of 76 and 77 causes the block to become an LWSS or MWSS; this immediately crashes into the beehive with tail so is of limited utility.

The syringe allows much more compactness and timing versatility in signal circuitry than Herschel conduits alone, and in combination with the Snark, it can largely replace very long p1 Herschel tracks (if they are not required to be Spartan, and the dependent form is spartan) by simply passing a glider from somewhere near the start to somewhere near the destination. This works similarly to Herschel transmitters and receivers, but in more flexible way. Within 3 days of the syringe's discovery, over half of all known guns from periods 14 to 999 were obsoleted by loops involving a syringe and various Snarks.

The syringe was voted Pattern of the Year for 2015 on the forums.[2]

Dependent form

A variant of the syringe that replaces the welded eater 2 and eater 5 with a separate eater 2 and eater 1 was used in the Demonoid, a self-constructing spaceship. The eater 1 can only be made to fit if the syringe is followed by a dependent conduit. In rare cases where the following conduit does not allow any glider to escape at all (like the dependent beehive-producing H-to-MWSS conduit), only the eater 2 is required.

This 'dependent syringe', unlike the variant with the complex weld, is considered Spartan. It is most useful when attached to an Lx200, as this gives the minimal recovery time of 90. Another commonly used device in Spartan constructions is a small glider duplicator known as Scorbie Splitter.

Removal of block

If the initial block is removed, subsequent gliders entering the syringe will be cleanly consumed by the eater 2. This was utilised by the 0E0P metacell in various places to act as a one-time valve, with the dependent form of the syringe.

See also


  1. Tanner Jacobi (March 19, 2015). Re: Let's find a G-to-X (discussion thread) at the forums
  2. Alexey Nigin (February 11, 2016). Re: Pattern of the Year 2015 (Votes) (discussion thread) at the forums

External links