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TM 9-254
10-2.
Projector Collimator - Continued
Figure 10-2. Projector Collimator Reticle
10-3.
Collimating Telescope.
a.
Description. The collimating telescope (fig. 10-3) is a small straight tube telescope containing an objective
lens, a reticle, and an eyelens. The outside surface of the telescope is carefully machined so that its optical and
mechanical axes may be alined. The telescope contains no erecting system, so when viewing through the telescope, a
reverted, inverted image is seen upside down, with the right side on the left.
b.
Use. The collimating telescope can be used to establish a horizontal or vertical line by means of its own reticle to
test instruments for field-of-view tilt, reticle tilt, and diopter scales adjustments. It may also be used in the setup and
alinement of fire control test fixtures.
10-4.
Dioptometer.
a.
Description. The dioptometer (fig. 10-4) is a calibrated collimating telescope. It has a conventional type
focusing eyepiece with an attached diopter scale, a stationary reticle pattern consisting of two lines crossing each other at
right angles, and adjustable objective with a diopter scale and attached index. The eyepiece diopter scale ranges from +4
to -4 diopters and the objective scale is graduated from +1 to -1 diopter.
Change 2 10-2
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