(16)
t i l t s c a l e s
(17)
(18)
v e r n i e r s i n
TM 5-6675-319-14
When a true square is projected on easel, check both lens and easel
for 0 degree reading.
If scales read 0 degree, proceed to step (21).
If scales do not read 0 degree, loosen vernier securing screws and shift
elongated holes to obtain 0 degree reading.
(19) Insert sheet of bond paper between vernier and main scale to provide
clearance between moving parts.
( 2 0 ) T i g h t e n v e r n i e r s e c u r i n g s c r e w s.
NOTE
Focal length inscribed on front retaining ring of lens.
(21) Set scales to indicate the focal length of the lens.
l e n s . I f
step (23)
(22) Check conjugate distance scales for reading of twice the focal length of
scales are correct, go to step (27) .
If scales are not correct, go to
(23) To adjust both scales, loosen vernier securing screws.
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