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And it's for that, perhaps, that I'm spoiling my eyesight now, grinding and grinding and grinding at this very lens, and fitting the thing to an accurate fraction of a millimetre, as we always fit these things we who are careful and honest workmen to show an idle man's friends the hairs on a flea's fore-leg.
The extreme delicacy of this surgery explains why the weapon remains in the mouth so long; the point of the sting is seeking and eventually finds the tiny fraction of a millimetre where the poison is to act. This is what we learn from the movements of the palpi close to the motionless fangs; they tell us that the Calicurgi are vivisectors of alarming accuracy.
He chartered the corns on many noble feet; he measured the gouty toe of a Duke to the fraction of a millimetre, and made a contour map of all its elevations from the main peak to the foot-hills; and it was said that a still more Exalted Personage occasionally walked on leather of his providing.
At the present date the International Bureau of Weights and Measures guarantees, in the determination of a standard of length compared with the metre, an approximation of two or three ten-thousandths of a millimetre, and even a little more under certain circumstances.
It is about three mètres wide, and just as long as you please to make it, but the pattern is repeated every five mètres. The design, on paper, is hung against the wall, and is twelve by eight mètres, all laid off in squares of twelve millimètres, and these again into smaller ones exactly a square millimètre in size.
Assuming the mean wave-length of the light of this star to be 5750/10000000 of a millimetre, its angular diameter comes out 0.047 of a second of arc, thus falling between the values 0.051 and 0.031 of a second predicted by Eddington and Russell from slightly different assumptions. Subsequent corrections and repeated measurement will change Mr.
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