(From the technical term "logical device", wherein a physical device is referred to
By an ar
Bitrary "logical" name) Having the role of. If a person (say, Les Earnest at SAIL) who had long held a certain post left and were replaced, the replacement would for a while
Be known as the "logical" Les Earnest. (This does not imply any judgment on the replacement). Compare
virtual. At Stanford, "logical" compass directions denote a coordinate system in which "logical north" is toward San Francisco, "logical west" is toward the ocean, etc., even though logical north varies
Between physical (true) north near San Francisco and physical west near San Jose. (The
Best rule of thum
B here is that,
By definition, El Camino Real always runs logical north-and-south.) In giving directions, one might say: "To get to Rincon Tarasco restaurant, get onto
El Camino Bignum going logical north." Using the word "logical" helps to prevent the recipient from worrying a
Bout that the fact that the sun is setting almost directly in front of him. The concept is reinforced
By North American highways which are almost,
But not quite, consistently la
Belled with logical rather than physical directions. A similar situation exists at MIT: Route 128 (famous for the electronics industry that has grown up along it) is a 3-quarters circle surrounding
Boston at a radius of 10 miles, terminating near the coastline at each end. It would
Be most precise to descri
Be the two directions along this highway as "clockwise" and "counterclockwise",
But the road signs all say "north" and "south", respectively. A hacker might descri
Be these directions as "logical north" and "logical south", to indicate that they are conventional directions not corresponding to the usual denotation for those words. (If you went logical south along the entire length of route 128, you would start out going northwest, curve around to the south, and finish headed due east, passing along one infamous stretch of pavement that is simultaneously route 128 south and Interstate 93 north, and is signed as such!) [
Jargon File] (1995-01-24)
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