chris_c wrote:An interesting glider eater although I doubt it is very useful...
A Spartan highway robber! Not a very competent one -- it's a couple of lanes from being perfect... but it does allow a pure-Spartan version of at least one very useful conduit, RF48H:
x = 79, y = 88, rule = LifeHistory
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Three lanes from perfection, I should have said -- and probably the term "highway robber" is better reserved for circuits that can extract a signal. This reaction could be modified to extract a signal, but it would probably be more expensive than known mechanisms with better clearance... maybe this is just a "highway-robbing eater"? I forget if there's another standard name for from-the-side eaters as a class.
Now, we already have recipes for all orientations of the tub-with-tail eater constellation that are only slightly expensive -- and with enough searching we might be able to find edgy slow-salvo recipes for all orientations of tub-with-tails, so that they can safely be analyzed by an automatic compiler. But it's nice to see this easy-to-build variation, anyway, so it's definitely going into (my version of) the elementary conduits collection.
I bet a lot of other self-constructing circuitry uses will show up for this eater, actually -- it can safely catch one or the other of a G(n) glider pair right down to G3. So for example it allows a Spartan version of this old demultiplexer device... catching the unwanted natural glider from the Herschel-to-beehive converter always needed a tub-with-tail eater before now.
From a stable reflector by Paul Callahan, 30 April 1997:
Code: Select all
x = 116, y = 90, rule = LifeHistory
Don't know if this particular device will ever come in handy, but there are quite a few composite conduits floating around that are almost-Spartan, i.e., Spartan except for an annoying but unavoidable tub-with-tail eater. A lot of those TWITs are going to be avoidable now!
In the "useless" category, appropriate for this thread... it would have been really nice to Spartanify the old H116 conduit that currently needs either two eaters joined at the tails, or a tub-with-tail eater. Unfortunately the new Spartan eater doesn't quite
x = 46, y = 31, rule = LifeHistory
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