Front:
103 -TELESCOPE WITH 40 IN. LENS, LARGEST IN THE WORLD.
WILLIAMS BAY ON LAKE GENEVA, WISCONSIN
3A-H331
Back:
The 40 inch telescope of the Yerkes Obser-
vatory has the largest lens in the world.
The instrument is 63 feet long and with
attachments for photographic work 6 feet are
added.
The tube weighs 6 tons and the moving
parts weigh 20 tons.
It is so delicately balanced that it can be
moved with one hand.
BISHOP POST CARD CO., RACINE, WISCONSIN
"C.T.ART-COLORTONE REG.U.S. PAT. OFF.
