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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