An Etymological Dictionary of Astronomy and Astrophysics

The largest → refracting telescope and
the last of the great refractors with a lens diameter of 102 cm (f/d = 19),
completed in 1897. The lens was ground by American telescope builders Alvan Clark & Sons. Used mainly for both visual and photographic studies of double stars, it is typical of the long-tube refractors traditionally employed in such work.

See also: After Yerkes Observatory; → refractor.