Beam and tape
RESTRICTED
BEAM AND TAPE
A.
Reason
for Use.
this procedure the purpose is to simulate
The bombsight is actually used in this test
exact-
ly the same as on a bombing run to determine ex-
actly where the rate quadrant wili be positioned
then the sane brobien is wo
to determine
exactly at which position the rate
quadrant should be for those circumstances.
this
way,
it can be determined whether or not the
rate end is solving the bombing problem correctly.
B. Set Up Beam And Tape.
Level stand and
Wedge gyro to
"irst bertieri.
Check vertical of optics.
Level beam.
1000 mil method of develing beam:
Set telescope indicator at exactly
zero.
Slide steel scale on Deam
so that the zero
of the beam comes underneath the transverse hair.
Set telescope indicator at exactly 45°.
Raise or
lower the end of the beam until the 1000 mii mark
on the
scale comes exactly underneath the
transverse hair.
C.
Model Problem and mathematical Solution.
1. Given:
Altitude
Actual time of fall
Trail in mils.
Ground Speed.
15,000 ft.
35 sec.
70 mils
150 knots
2.
Find:
Actual
range Angle
in tan
func-
tion)
that would be correct for
such data.
3. Solution:
function of Actual Range angle
equals Actual Range
feet divided
by the Altitude in feet.
in
the
flight
of
the
piane
at
a
certain
speed,
and
a
certain
bomb
cf
a
given
demonstrate
how
the
bombsight
scives
the
bombing
problem
mechanically.
Then
the
same
problem
is
worked
out
2.
true
vertical.
3.
steel
Tan
in
215