TM-9-1240-401-34-P

TELESCOPE MOUNT M146: M118A2 AND M118A3; TELESCOPE MOUNT M145: M145A1; PANORAMIC TELESCOPE: M117 AND M117A2; FIRE CONTROL QUADRANT: M15; PERISCOPE: M42

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL

JULY 1993

TM-9-1240-401-34-P - Page 106 of 590

TM 9-1240-401-34&P

3-29. M118A2/M118A3 ELBOW TELESCOPE FINAL INSPECTION AND ADJUSTMENT

- continued

a. SETTING UP TELESCOPE FIXTURE

1

2

3

4

5

6

7

8

9

10

11

Place telescope fixture (1) on a level surface at a

height suitable for viewing through telescopes.

Place test bar assembly (2) in position on tele-

scope fixture (1), making certain that the test bar

spherical ring is seated in the forward clamping

block (3).

Insert tapered pin (4) through adapter block (5) and

into test bar assembly (2). Secure tapered pin

(4).

Install collimating projector

(6)

in its holder on tele-

scope fixture (1), with vertical reticle line approxi-

mately plumb.

Remove diffusion disk (7) from collimating projector

(6).

View through the collimating projector (6) and en-

sure the horizontal and vertical lines of the

collimating projector (6) reticle, as reflected by the

mirror in the test bar assembly (2), are superim-

posed on each other. If not, adjust screws (8) on

collimating projector (6) holder until the lines are

superimposed.

Remove test bar assembly (2) from telescope fix-

ture (1).

Replace diffusion disk (7) in collimating projector

(6). Replace light source (9).

Install collimating telescope (10) in collimating tele-

scope holder (11).

Adjust height of collimating telescope (10) until

reticle crosslines are superimposed on the reticle

crosslines of collimating projector (6).

Suspend plumbline to one side of telescope fixture

(1),

approximately 30

feet (9.14 m) from collimating

telescope (10).

3-48