'With a 40-inch lens, a telescope at the Yerkes Observatory in Wisconsin is the largest of this type'
Refracting Telescope
OBSERVATORIES: With a 40-inch lens, a telescope at the Yerkes Observatory in Wisconsin is the largest of this type
With a 40-inch lens, a telescope at the Yerkes Observatory in Wisconsin is the largest of this type
With a 40-inch lens, a telescope at the Yerkes Observatory in Wisconsin is the largest of this type
OBSERVATORIES
Refracting Telescope
OBSERVATORIES