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 TM 9-258
b. The 90ƒ head prism, objective lens, reticle
corrections for factors peculiar to the individual weapon
and its emplacement, can be entered easily into the
and erector lens are included in a single assembly which
instrument and is an integral part of the counter
permits no relative movement between the reticle and
mechanism.
the head 90 prism as the cab traverses in azimuth.
Figure 8-14. Panoramic telescope (Self Propelled
Howitzer)- assembled view.
Section V. PERISCOPES
operation of the periscope is that double reflection of
8-13. General.
light from two paralleled mirrors, each placed at a 45ƒ
a. The basic purpose of the periscope is to
angle and with their reflecting surfaces facing each other
raise the line of vision in order that targets may be seen
from entrenchments, or from behind obstructions, or out
of
enclosed
vehicles.
The
principle
of
8-10
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