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Page Title: Figure 8-16. Optical diagram and optical elements of periscope.
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TM 9-258
b. Solid 90ƒ glass prisms can be used instead of
an angle of 90 twice and to displace the line of vision
vertically.
plane mirrors (fig 8-16 to reflect the light through
Figure 8-16. Optical diagram and optical elements of periscope.
when struck by a projectile and not jam or injure the
8-14.
Periscope (Tank Observation).
periscope body.  Spare heads are furnished for a
a. The periscope illustrated in figure 8-15 is
replacement. When the periscope is in place, only the
typical of those designed for use as an observation
head projects through the tank.
instrument, to view outside objects from the inside of a
b. The optical system (fig 8-15) consists of two
tank. It has a rectangular body with a removable top or
plane mirrors, two vertical windows, and two horizontal
head and a removable bottom or elbow. The top surface
windows.  The mirrors are mounted at 450ƒ angles,
of the head and the bottom surface of the elbow slant at
the same 45ƒ angle. Clamps attached to the head and
parallel to and facing each other. One mirror is mounted
in the head, the other in the elbow. The vertical windows
elbow engage latches operated by eccentric assemblies
are mounted in the front of the head and in the rear of
in the periscope body. They hold the head and elbow
the elbow. The horizontal windows, of thicker glass, are
firmly on the body yet permit ready removal. Plastic
mounted in the bottom of the head and in the top of the
material is used in the construction of the head to permit
elbow.
Gaskets  around  the  edges  of  the
it
to
shatter
into
small
fragments
8-12

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