The Norden Bomb Sight manual

precoss about the fore and aft axis and in the

transverse plane.

It must be remembered that the

gyro must be running to secure the above precess-

Ions; otherwise the gyro and cardan will move in

the opposite directions. (Review laws of precess-

ion.)

The case which houses the gyro and cardan

Is divided into two parts, the upper and lower

housings.

The upper housing is

attached to the

lower part of the case

with eight (8) screws.

The two (2) screws in the upper part of the left

end must be removed in order to remove the upper

housing.

Located in the center and rear of the lower

housing is the cross trail knob which is turned

to the left to set in

trail.

When this knob

i s

turned an

eccentric disc

and stud

are moved to

the rear of the center of the sight stem.

The

purpose of this eccentric disc will be discussed

This knob is found on the M-l, M-2, and

M-3 sights only.

On the upper half of the housing

we have, in the center top left, the caging knob.

This is

knob, and

locks the gyro in

a near vertical position when not actually making

bombing.run.

Near this knob but to the rear of

the housing we find a window which allows

the

bombardier to see the obtics.

In the case of the

M-3,

the telescope moves,

and in the case of the

M-6, it consists of a stationary eye piece.

Just

below this

window,

but on the lower half of the

sight housing we

telescope light knob.

The purpose of this light is to light up the cross

hairs.

This is done

two slots, one

in the case, and

a matching slot in the telescope

telescope light knob controls a rheo-

The extreme right end of the sight is made

up of a switch and four knobs, the altitude, rate,

displacement and search knobs.

jutting out from the rate end, we find a semi-

circular calibrated

plate and a

movable arm.

This

is the

trail setting mechanism and by

the arm

is set.

Just beneath this mechanism is a

switch which turns "on" and "off the tel-

On the left side of the rate end,

as we face it

the altitude knob, which is cal-

in disc

speed and altitude in

feet on

units.

knob controls the speed of the

telescope motor and disc.

At a point just below

the center of

the diameter of the rate end are the