The Norden Bomb Sight manual

3. Disc

4.

Rate and

Displace-

ment Knobs

B. Rate

End Com-

puter

Half.

1. Roller

Fig. 33

pg.

N.O.P.

·650

pg. 26

2.

Automatic

Release

Mechanism

(Sight)

The disc must be kept free of dirt and dust.

Clean with benzine

or alcohol.

Rub dry with clean

white cloth.

Apply a film of light bombsight oil.

Remove, with

a clean white cloth,

all excess oil.

Oil the

smooth bearing on the disc shaft and the

tachometer shaft

bearing with one drop of light

oil if

cleaned.

DO NOT OVEROIL. NEVER USE AN ABRASIVE ON THE

DISC.

The spring tension on the disc is tested by a

2lb. weight.

Check for freedom of movement.

If knobs do

not move

freely,

disassemble and

zIne

alcohol

or carbon tetrachloride.

Oil all

working parts

with

light bombsight oil. Remove

all excess oil with a clean white cloth.

Keep the rate end free of dust and dirt. Keep

all gears clean.

requires very little oil. A thin

film of oil is all

is needed

on the smooth

bearings, racks and spindle screw.

The roller is

a very important part of the

computer system

and must be

kept in perfect work-

ing condition.

Keep roller free from dust and dirt.

Clean with benzine

and alcohol, coat with film of

light bombsight

oil. Remove all excess oil with

clean white cloth. When cleaning the roller, be

very careful

no dirt or other particles

get

into the bearing.

ratic roller

The roller should

never be positioned at the

censer a flate spisextepe worntest the poses, and

the roller and

a depression worn

on the

center of the disc.

flat spot on roller is easily detected by the use

the points

to close when

the telescope and

indicators

are perfectly matched.

The points

mounted

on the

rate quadrant. Adjustments are

movable. point.

and

with

The

rate

end

that

This

bearing

must

be

clean,

for

tiny

particle

will

cause

binding

and

er-

cause

a

flat

spot

will

be

worn

on

A

a

Set

rate

are

made

on

the