The Norden Bomb Sight manual

to the rate quadrant and for that reason would

arrive at the set actual range angle position of

the rate quadrant

too soon; (2) second,

because of

the acceleration of the rate of drive

of the tele-

scope quadrant, it wili be travelling

too fast

toward the

quadrant; that

sighting

angle changes more

angle chases e be slowliven at arnet 37°a 37%

sighting angle.

2.

reasoning leading to

an opposite

conclusion is followed where the optics are to the

rear of vertical when the telescope guadrant is at

zero degrees.

3. When the

position of the transverse

hai r

is out of relationship to the position of the

telescope quadrant, it is obvious that the optics

will not be driven toward vertical at the

rate that the sighting angle changes. This is

because of the acceleration of the rate of drive

of the

telescope quadrant.

The quadrant will

drive at the

rate

changes only when

it is set the same

ing

angle. Therefore, this is another of the three

cases in

synchronization is impossibie,

it is

the most important

example.

The remaining

example is that of

erratic disc speed.

4. The transverse hair may be in the verti-

cal

with the

telescope

quadrant at zero, and yet

when

the optics

are being opened toward maximum

sighting angle,

transverse hair may get

out of

relationship to the telescope

quadrant.

This will

occur only when

of foreign matter is on

one of the sheaves and it begins to contact the

cable when the

optics are opened up to that

point,

or it will occur where there

a kink in the

cable and only

then when that kink begins to con-

tact one of

The transverse hair

should

always be at exactly the same setting

the telescope quadrant throughout the

entire

range

rate

is,

the

the

optics

are

being

driven

at

a

rate

for

a

the

sight-

and

a

piece

is

the

sheaves.

of

the

telescope