National Geographic : 1919 Aug
Photograph from Yerkes Observatory THE HOME OF THE WORLD'S GREATEST REFRACTING TELESCOPE The Yerkes Observatory, at Williams Bay, Wisconsin, is one of the finest in the world. It housesthe big refracting telescope shown onpage 161 and many other heavens-searching instruments. The big dome at the right is constructed so that itcan berevolved, thus bringing the shutter opening over the skyward end of the telescope, whatever the position. The floor of the dome can beraised and lowered, sothat the observer can always get to the eye-piece without difficulty (see text, pages 160 and 162).