Section X. ILLUMINATION MIRRORS

TM 5-6675-306-14

Section X. ILLUMINATION MIRRORS

4-17. General

Flash point of solvent is 100 0 F.-138

F. (380 C.-59 a C.)

Two identical rotatable illumination mirrors (fig. 1-1)

are

used to reflect available natural light through

the

(1) Clean the metal parts with a soft cloth

illuminating prisms within the theodolite and onto

the

moistened with an approved cleaning solvent. Clean

reading circles.

At night and on dark days

the

the mirror with a camel's hair brush if dusty, and with the

illumination mirrors are not used.

4-18. Illumination Mirrors

chamois if foggy.

a. Removal. Refer to figure 4-4 and remove

the

(2) Inspect the hinge action for stiff or loose

illumination mirrors.

movement.

It should remain in the position where

b. Disassembly .Refer to figure

placed. Inspect the push-fit mirror mounting for close

4-5

and

fit, distortion, and other damage. Oil the hinge sparingly

disassemble the illumination mirrors.

if needed and wipe off all excess oil. Inspect for a lost,

c. Cleaning and Inspection.

cracked, or broken mirror.

WARNING

(3) Replace a defective illumination mirror.

d. Reassembly.

Refer to

figure

4-5

and

Dry cleaning solvent, P-D-680, used to

reassemble the illumination mirrors.

clean parts is potentially dangerous to

personnel and property. Avoid repeated

e Installation. Refer to figure 4-4 and install the

and prolonged skin contact. Do not use

illumination mirrors.

near open flame or excessive heat.

4-9