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Published online by Cambridge University Press: 10 May 2010
page 168 note * London is, however, omitted; it was therefore never contemplated that it would visit the British isles.
page 168 note † There is also a small round hole for the bob of a plumb-line, for the perpendicular adjustment of the instrument.
page 171 note * This is apparent in the postscript, which is difficult to construe.