The Norden Bomb Sight manual

with the telescope quadrant and the cable passes

through

center

of the

quadrants, through the

over sheaves 3

right cardan gudgeon is attached to the

and 4 to num-

ber 5 sheave, which

telescope

cradle. The gear on

the #5 sheave shaft is in

with the gear sector on the M-6 and with the tele-

scope sector on the M-3.

The mirror or telescope

is then driven at an angular speed

proportional to

ground speed.

The telescope

is stabilized by the vertical

In the

computing

the rate end, there

angles generated

by the movements

of the

two quadrants formed by

The angles

are equal

and are equal

a line directly beneath the

plane to the ground at the instant of bomb release

and the line of sight to the ground at the instant

of bomb

release.

These angles are

DEF (telescope

quadrant) and GHI (rate quadrant). Each angle is

determined by the amount the racks are moved. When

the indices coincide each rack has

been translated

a distance proportional to actual range. There is

also an angle equal to DEF (telescope quadrant)

formed through the

telescope by the line of sight

and

the vertical.

if this

angle

were projected downward assum-

ing the sight is in an airplane, the angle would

subtend

actual

range distance on the ground.

The

small triangle formed within the sight has

for its legs the altitude vector and the

linear

distance the rate rack is driven in translation

as

the roller is displaced from the disc center by the

rate mechanism.

The acute angles of this triangle

are proportional and similar to the angles DEF and

GHI.

The rate quadrant is positioned at the range

angle determined by the point of synchronization.

The

angle formed by the rate quadrant,

as it is

positioned,

is the generated range angle and is

equal to the sighting angle and the dropping angle

at the instant of bomb release.

The

telescope quadrant is driven,

and at the

determined range angle the indices coincide and at

that point the angles DEF and GHI are equal. It is

important to remember that the position of the rate

quadrant will determine the dropping

angle comput-

ed by the sight.

If this angle is incorrect the

bomb will miss

the objective.

To ellminate errors

the sight

must be accurately calibrated and the

correct trail, etc., must be set into the sight.