Stolen from Slashdot:
“How old is the oldest known technical manual? About 613 years, it seems. Written in 1391 by Geoffrey Chauncer for his ten year old son Lewis (Lowys), the manual explains in great detail but very rough spelling and grammar, the intricate workings of the Astrolabe–the predecessor to the sextant. Read Chauncer’s ‘A Treatise on the Astrolabe here.”
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