TM 5-6675-322-14
CHAPTER 4
STEREOMETER PARALLAX BAR
Section I
INTRODUCTION
4 - 1.
GENERAL INFORMATION.
4 - 1 . 1 S c o p e .
a.
Model Number and Equipment Name. Stereometer parallax bar.
b. Purpose of Equipment.
To determine height differences when viewing
stereoscopic photographs.
4 - 1 .2
G l o s s a r y.
Absolute Altitude . . . . . . . . . . . . . . Altitude of aircraft
above surface of earth.
Fiducial Mark . . . . . . . . . . . . . . . . Marks on edge of photo-
g r a p h t o i n d i c a t e o p t i c al
center of photograph.
Differential
Parallax
.
.
.
.
.
.
.
.
.
.
.
. Small linear displacement
between same photographic
images on different pho-
tographs resulting from
h e i g h t o f s u r f a c e.
Principal Point on Photograph . . . . . . . . Center of one photograph
that can be transferred
to adjacent stereophoto-
graph.
Stereo-Pair Photographs . . . . . . . . . . . Photographs taken at dif-
ferent positions showing
same features.
4-1
