The Norden Bomb Sight manual

P. Sight

Cardan

Q. Explan-

ation uf

Wiring

Fig. 36

fixed lead weights used in balancing the bombsight

gyro.

The gyro casing is carried in the bombsight

cardan by fore and aft gudgeons working in ball

bearings.

The gyro stabilizes the cardan in a

and aft plane

through

these gudgeons and

bearings, and

stabilizes the telescope cradle in

a transverse plane by means of the cradle connect-

ing rod.

The cardan furnishes support for the fore and

aft bearings of the

gyro in its left half and sup-

port to the fore and aft bearings of the telescope

cradle in its right half.

The cardan is supported

by gudgeons working

in ball bearings in the case,

as the right

and left cardan gudgeon bear-

ings. The right cardan gudgeon is drilled to per-

mit the telescope cable to

pass through its axis,

and is a fixed bearing.

The power for operating the bombsight comes

the plane's

supply.

The power

enters the

stabilizer female cannon plug through the number

two pole,

from the number two pole to the bomb-

Sight switch to the

number two pole of the female

sight cannon plug.

From number two pole the cur-

sight gyro, bubble light and re-

ticle light and to the telescope motor,

There is

a circuit from poles three and four of the stabil-

izer female cannon plug to poles three and four

of the

sight female cannon plug and then

to the

automatic release points,

through

the points to

an electro-magnetic relay

in the bombracks.

Consider the circuit to the bombsight gyro.

The current goes from the bombsnght switch to the

number two pole of the bombsight cannon plug to

the flexible lead from the case to the cardan

the flexible lead from the cardan to gyro housing

to the sight gyro through the field coils and ar-

mature across flexible lead from

the gyro to the

cardan, across the

flexible lead from

the cardan

case and

then to the number one pole which

is the ground.

current to the gyro branches to the bub-

ble light

and

passes through

the

same flexible

and

circuit to number one

pole.

Another circuit goes directly from

number two

pole to the

rheostat reticle light. This light is

is used to light the cross hairs for night bombing.