The Norden Bomb Sight manual

er tangent value.

The bomb will be

released too soon and a "short"

would

result.

worn Roller.

a.

Whentrail has been

set in, the rol-

ler will rest upon the disc theprop-

er distance upward for trail.

since the roller is of smaller cir-

cumference,

it obtains its

necess-

агу

for synchronization at

lower point on

the disc.

This

means the rate mechanism is displaced

less (used less! than it should be,

and this means that the rate quad-

rant is not at the correct dropping

angle for the given altitude, velo-

city of closure,

trail value of

of the bomb.The result is an

"over".

3.

Slipping Roller.

a.

As in "2

there is no difficulty with

trail, but since the roller slips,

in order

to obtain the necessary

roller R.P.M's to synchronize,

the

roller will have to be raised

er up on the disc than otherwise.

The result is excessive use of the

rate mechanism, and the rate quad-

rant

will have

brought down-

ward

too far toward the

oncoming

telescope quadrant.

(1)

This

is one of the three cases

in which itis impossible to synchr-

onize.

This is only

because roller

slippage is never at a constant rate;

it increases as the optics

approach

zero degrees because of

increasing

tension on the telescope mirror re-

turn

spring.

4. Incorrect Disc Speed.

ЗУ П -

Chroniya: on

a disc steed

a dise sagga: 0000

* 30

speedi

a disa

anism is occasioned.

SC.

-123:

C* 3 2:s0

3-₴ 3-

mech-

rofier

for

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fow

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