Lacaille’s Telescopium
Lacaille described Telescopium as
representing the great astronomical refractor at Paris
Observatory which, in common with other large refractors of the
day, had an exceptionally long tube to combat chromatic
aberration and was suspended from a mast by ropes and pulleys.
This illustration comes from a copy of Lacaille’s chart
of the southern stars published in the Atlas Céleste of
Jean Fortin. (Image © Ian Ridpath.)
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