Page 410 - 89 history of astronomy_opt

Then there are the 5-foot Yerkes reflector at
Chicago, and the 4-foot by Grubb at Mel-
bourne.
Passing now from these large reflectors
to refractors, further improvements have been
made in the manufacture of glass by Chance,
of Birmingham, Feil and Mantois, of Paris,
and Schott, of Jena; while specialists in grind-
ing lenses, like Alvan Clark, of the U.S.A.,
410