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

356
all combinations where both sides are used, both sight setters
indicators must be in operation. Under sight control from
turret 2 the sights of turret 2 are used as in local control
except that gun elevation orders and turret train orders are
transmitted to turrets 1 and 3 by either sight station elevation
order transmitter and turret train transmitter.
53. All of these various selections and combinations
of control are made by use of the synchronizing clutches,
(sight angle and pointer's elevation order,) the turret train
order selector clutch, and the turret train operators selector
clutch. There is a synchronizing dial in connection with
each of the synchronizing clutches which must be matched before
engagement of the clutch. It is not intended to have the
two synchronizing clutches of the same system engaged during
operation. All clutch engagement combinations are evident
from the operation. However , it should be observed that sight
angle is supplied to the elevation indicators by the sight
setter on' the side where the pointer is firilig, in all combinatiohs.
54. The details of the sight operation ar~ sho~n schematLca.Lly
on plate 15. The differential at the pointer's station
operates to combine pointer IS handwheel arid sLght angle
Lf.ne of sight inputs to elevate and depress the telescope lines
of sights. The differential at the trainer's station operates
to compensate for movement of the telescope in deflection due
to the planetary rotation of the deflection sector around the
pinion when the telescope is rotated in elevation. For each
revolution of the elevation bracket the compensating differential
and gear trains add one revolution to the deflection
pinion in the same direction. This adds to or subtracts from
sight setter's deflection input resulting in compensated deflection.
ADJUSTMENTS
55. The sights are adjusted to cause the telescope lines
of sight to be parallel to each other, to elevate and depress
in planes perpendicular to the center line of the trunnions,
to deflect in planes parallel to the center line of the trunnions,
to correspond to all readings of sight angle and gun
elevation dials, and correspond to all deflection settings.
This is accomplished by the general methods described in a.p.
762. "Alignment of Sights," through the use of Boresight, Mark
75 or Mark 8, Mod. 6, Bore Sight Telescope Holder and Muzzle
Disk, Mark 2, and by the adjus tment provisions within the sLgrrt .«
The elements providing adjustment are tapered liners between
the station housings and the gun girder cover plates, shims
at shaft and gear brackets, and adjustable couplings on the
sight shafts.
* Also see Appendix III, tlSight Alignment. tl