OP-755 Part 2 Pages 197-401 - Personal Page of GENE SLOVER

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8. The altitude mechanism as initially installed will
be modified when an aut.oma ti c stabilizer for the elevating
motion is added. .The alterations will involve attachment of
an appropriate lever or other device on the pinion shaft, addition
of a clutch element between the handwheels and the driven
shaff, and removal of the;altitude limit stop device. (Limit
stop will be provided within the stabilizer mechanism.)
Deflection Mechanism
9. The range finder is .positioned in azimuth by rolling
the carriage on the rail bracket s wi th center of motion
pivoted at the center of the carriage beam. This movement is
performed by ahandwheel actuated deflection setting mechanism
which is arranged as shown on drawing number 217227. Positionellhorizontally
near the center.and on top of the beam, the
handwheel drives a deflec tion bevel gear and thence, right and
left, pinions, shafts, and worm wheels; inte'gralpinions of
the latter are meshed with the rail bracket rack (each side).
The arrangement gives equal, simultaneous traverse for the two
bearings. Deflection stops at each end of the darriage limit
the movement to four degrees thirty minutes each side of a
line normal to the turret longi tudinal center line. A deflection
indicator dial, located in the top of.the handwheel gear
box and moving against a fixed index, is graduated in mils to
show range finder azimuth position.
10. At zero degree deflection (100 mil calibration on
the indicator dial) plungers at each end of the beam register
with holes in the respective rail brackets. This locking arrangement
for securing the carriage is actuated by a hand lever,
an eccentric shaft and connecting shafts coupled to the
two plungers. In addition to this locking device, the design
of the deflection setting worms and worm wheels is such as to
prevent drift or overhaul. Deflection settings thereby remain
as set.
Hoods
11. The right and left hood assemblies comprise cast
steel hoods, cover plates, shutter frames of phosphor bronze,
and screw mechanisms operating bronze shutters which are manually
operated from the inside of the turret. The design includes
fitted fabric sleeves secured to the range finder and
closing the hood apertures in the armor to provide weather and
gas seal. The shutters, when closed, wedge against ground
seats to provide weather seal.
12. The range finder objectives are fitted with cylindrical
shades which move into the open hood ports at limits
of azimuth movement. Because of this design arrangement the