Herschel conduit

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A Herschel conduit is a conduit that moves a Herschel from one place to another.

Well over a hundred simple stable Herschel conduits are currently known. As of the end of 2017, the number is approximately 130, depending on the precise definition of "simple" -- e.g., fitting inside a 100×100 bounding box, and producing output in no more than 300 ticks. In general a Herschel conduit can be called "simple" if its active reaction does not return to a Herschel stage except at its output. A description of common usage in complex circuitry, using syringes and Snarks to make compact connections, can be found in Herschel circuit.

The original universal set consisted of sixteen stable Herschel conduits, discovered between 1995 and 1998 by Dave Buckingham (DJB) and Paul Callahan (PBC); these are shown in the following table. In this table, the number in "name/steps" is the number of ticks needed to produce an output Herschel from the input Herschel. "m" tells how the Herschel is moved (R = turned right, L = turned left, B = turned back, F = unturned, f = flipped), and "dx" and "dy" give the displacement of the center cell of the Herschel (assumed to start in the orientation shown to the right).

Name/steps m dx dy discovery
R64 R -11 9 DJB, Sep 1995
Fx77 Ff -25 -8 DJB, Aug 1996
L112 L -12 -33 DJB, Jul 1996
F116 F -32 1 PBC, Feb 1997
F117 F -40 -6 DJB, Jul 1996
Bx125 Bf 9 -17 PBC, Nov 1998
Fx119 Ff -20 14 DJB, Sep 1996
Fx153 Ff -48 -4 PBC, Feb 1997
L156 L -17 -41 DJB, Aug 1996
Fx158 Ff -27 -5 DJB, Jul 1996
F166 F -49 3 PBC, May 1997
Fx176 Ff -45 0 PBC, Oct 1997
R190 R -24 16 DJB, Jul 1996
Lx200 Lf -17 -40 PBC, Jun 1997
Rx202 Rf -7 32 DJB, May 1997
Bx222 Bf 6 -16 PBC, Oct 1998

Also see

External links