SYNCHRONIZATION AND BACKLASH CHECK OF 165 MM GUN WITH
GUNNER'S PERISCOPE M32C-RAMP METHOD (CONT)
Have driver position tank on comparatively level ground, with rear of tank toward a
ramp or hill (view A).
The ramp or hill should have enough grade to allow
later positioning of the tank to about 267 mils from
horizontal. The ramp or hill should also be located
about 600 meters from a suitable target such as a
straight line of trees, a building, or a post. An imaginary
line from the line-of-sight of the gun to the target should
be near horizontal to avoid a large gun elevation angle
when the tank is later positioned on the ramp or hill.
Place black thread (1) over witness lines on muzzle of gun tube to form a cross. Attach
thread with tape or strap (2).
Using gunner's periscope, select a target with clearly defined right angles as near 600
meters as possible (view B). (Range, if possible, should be surveyed.)
Depress main gun with manual elevation hand pump and continue pumping until it is
hard to turn (TM-10).
Perform calibration of Gunner's Qutadrant M1A1 (TM 9-1290-200-14&P).
Check gunner's periscope daylight reticle for parallax (para 3-5).
GO TO FRAME 2
Para 3-4 Cont