The Norden Bomb Sight manual

1.

Instal-

lation

of Tele-

scope

Cable

M-3

L. Teles-

cope

and

Cradle

Assembly

M-3

Set telescope at maximum signting angle

and remove old cable from 1, 2, 3, and

sheaves.

remove #5 sheave and remove the cable from

Caution: do not let the telescope fly back against

the

stop.

2.

Thread

cabie througn

sheave and

form

an incompete right

hand loop in

the end of the cable.

3.

Place loop

around farther anchor screw,

and turn screw down

enough to hoid

cabie.

Caution:

always keep cable away from screw threads.

Take up slack in cable and tighten other

anchor

screw snugly.

Tighten

first

anchor screw.

5.

Thread cable around #4 sheave and install

#5 sheave with telescope at minimum

sighting angle.

6.

Replace taper pin.

Wi thi

telescope at

minimum sighting angle the lead hole in

to sheave

should be just to the rear of vertical and no cable

wound on the sheave. Let telescope

return to max-

imum

sighting angle

as cable winds on #5 sheave.

7.

Thread cable around #4, 3 and 2 sheaves.

8. Check

# sheave

with

telescope at 60°

sighting angle.

Eccentric clamp

should

be

app-

roximately vertical with the eccentric screw

siot

horizontal.

Set telescope quadrant at 40°

10. Thread

cable partially around

#| sheave

and

lead hole.

Pull telescope to

first mark

on coincidence scale and

fasten cable

to #i sheave.

11.

Check to see that cable pulls

tangent to

#5 sheave and does not double wind on

* | sheave at

minimum sighting angle.

Also check to see

that

cable does not double wind on #5 sheave at maximum

sighting angle and comes from #l sheave on the

tangent.

This assembly consists of the telescope,

tel -

escope return spring, telescope sector gear,

tele-

scope cradle,

telescope cradie gudgeon

(working in

ball bearings), telescope coincident

scale, the

number

five

sheave and

gear shaft.

This

entire

assembly tilts in

a transverse

direction left or right about the fore and aft

gudgeons working in ball bearings and independent-

ly of the vertical gyro. The entire assembly tilts

fore and aft if the cardan tilts fore and aft. The

entire assembly is stabilized fore and aft by the