TM 5-3610-253-14
Mounted on rear of backgauge. The glass
b. Periscope. Houses OMI components.
rule runs through a slot in periscope.
Focuses light through glass
c. Condenser lens. Mounted below glass rule.
rule and into periscope housing.
d. Projection objective lens. Magnifies, focuses and projects the glass rule
marks onto the OMI screen via the oblique mirror.
Screen. Positioned at top front of periscope. Displays projected image of
glass rule markings.
clutch . It is comprised of:
5-10
