| les con-
t par suite
ible d'un
et de re-
‘, de tireuses
andes diffi-
srandisse-
vorable à
mr: 1'1.G. N.
A Precision Vertical Reference System
for
Photogrammetric Applications
Presented as a Commission I Paper at London
Ninth International Congress of 1960
of International Society of Photogrammetry
by
T. Trott
Chief Engineer
The Aeroflex Corporation
Aeroflex Laboratories Division
34-06 Skillman Avenue
Long Island City 1, N. Y.
U.S. A.
