Front:
THE 82-INCH RE-
FLECTING TELESCOPE
W. J. MC DONALD
OF THE
OBSERVATORY OF THE
UNIVERSITY OF TEXAS.
THE 82-INCH CONCAVE
MIRROR, MADE OF PY-
REX GLASS, IS 11 AND
THREE
EDGE
FOURTHS IN-
CHES THICK AT THE
WEIGHS
ABOUT 5600 POUNDS.
Back:
ORIGINAL CAMERA STUDY
REPRODUCTION RIGHTS RESERVED
C. R. CHILDS CO., 5707 LAKE ST., CHICAGO
TRADE
REG.
MARK
POST CARD
