<s>
The	O
Low	B-Device
Level	I-Device
Bombsight	I-Device
,	I-Device
Mark	I-Device
III	I-Device
,	O
sometimes	O
known	O
as	O
the	O
Angular	O
Velocity	O
Sight	O
,	O
was	O
a	O
Royal	O
Air	O
Force	O
(	O
RAF	O
)	O
bombsight	B-Application
designed	O
for	O
attacks	O
by	O
aircraft	O
flying	O
below	O
altitude	O
.	O
</s>
<s>
It	O
combined	O
components	O
of	O
the	O
Mark	B-Device
XIV	I-Device
bomb	I-Device
sight	I-Device
with	O
a	O
new	O
mechanical	B-Device
computer	I-Device
.	O
</s>
<s>
In	O
this	O
role	O
,	O
it	O
was	O
found	O
to	O
increase	O
the	O
chance	O
of	O
destroying	O
a	O
U-boat	B-Operating_System
by	O
35%	O
,	O
and	O
damaging	O
it	O
by	O
60%	O
.	O
</s>
<s>
In	O
1941	O
Bomber	O
Command	O
's	O
Operational	O
Research	O
Section	O
(	O
ORS	O
)	O
had	O
been	O
investigating	O
Coastal	O
Command	O
operations	O
against	O
German	O
U-boats	B-Operating_System
,	O
which	O
until	O
this	O
time	O
had	O
been	O
only	O
moderately	O
successful	O
at	O
best	O
.	O
</s>
<s>
Comparing	O
average	O
bombing	O
accuracy	O
with	O
the	O
bombs	O
being	O
used	O
,	O
they	O
suggested	O
that	O
a	O
larger	O
bomb	O
be	O
developed	O
for	O
attacking	O
U-boats	B-Operating_System
on	O
the	O
surface	O
.	O
</s>
<s>
This	O
suggested	O
that	O
a	O
new	O
bombsight	B-Application
dedicated	O
to	O
the	O
role	O
be	O
developed	O
.	O
</s>
<s>
He	O
reported	O
that	O
the	O
earlier	O
Low	O
Level	O
Bombsight	B-Application
,	O
Mark	O
II	O
produced	O
error	O
when	O
flying	O
level	O
,	O
as	O
did	O
the	O
Mk	O
.	O
</s>
<s>
They	O
went	O
on	O
to	O
suggest	O
that	O
bombs	O
would	O
be	O
much	O
more	O
effective	O
against	O
small	O
ships	O
,	O
especially	O
if	O
the	O
Mark	O
XIV	O
bombsight	B-Application
was	O
available	O
.	O
</s>
<s>
III	O
,	O
as	O
well	O
as	O
older	O
bombsights	B-Application
.	O
</s>
<s>
The	O
basic	O
concept	O
behind	O
any	O
bombsight	B-Application
is	O
the	O
determination	O
of	O
the	O
range	O
,	O
the	O
distance	O
the	O
bombs	O
will	O
move	O
forward	O
after	O
they	O
are	O
dropped	O
from	O
the	O
aircraft	O
.	O
</s>
<s>
Conventional	O
bombsights	B-Application
of	O
the	O
era	O
consisted	O
of	O
some	O
form	O
of	O
iron	O
sight	O
or	O
reflector	O
sight	O
that	O
was	O
set	O
to	O
that	O
angle	O
.	O
</s>
<s>
Looking	O
along	O
the	O
line	O
extending	O
out	O
the	O
front	O
of	O
the	O
bombsight	B-Application
,	O
they	O
would	O
see	O
if	O
the	O
bomber	O
was	O
going	O
to	O
pass	O
over	O
the	O
target	O
,	O
and	O
issue	O
corrections	O
to	O
the	O
pilot	O
if	O
it	O
was	O
n't	O
.	O
</s>
<s>
Measuring	O
this	O
wind	O
is	O
accomplished	O
by	O
looking	O
through	O
the	O
bombsight	B-Application
at	O
objects	O
on	O
the	O
ground	O
,	O
and	O
then	O
calculating	O
the	O
angle	O
needed	O
to	O
fly	O
to	O
offset	O
this	O
motion	O
.	O
</s>
<s>
High-level	O
bombsights	B-Application
generally	O
spent	O
a	O
considerable	O
amount	O
of	O
their	O
design	O
complexity	O
on	O
trying	O
to	O
account	O
for	O
the	O
effect	O
of	O
wind	O
.	O
</s>
<s>
In	O
the	O
pre-war	O
period	O
,	O
it	O
was	O
found	O
that	O
a	O
significant	O
source	O
of	O
error	O
was	O
due	O
to	O
the	O
bombsight	B-Application
not	O
being	O
level	O
with	O
the	O
ground	O
when	O
the	O
bomb	O
aimer	O
was	O
trying	O
to	O
sight	O
through	O
it	O
.	O
</s>
<s>
In	O
order	O
to	O
turn	O
the	O
aircraft	O
onto	O
the	O
correct	O
approach	O
,	O
the	O
pilot	O
would	O
bank	O
the	O
aircraft	O
,	O
during	O
which	O
time	O
the	O
bombsight	B-Application
no	O
longer	O
pointed	O
at	O
the	O
target	O
.	O
</s>
<s>
This	O
eliminates	O
the	O
need	O
for	O
roll	O
stabilization	O
because	O
the	O
bombsight	B-Application
is	O
no	O
longer	O
needed	O
to	O
adjust	O
the	O
flight	O
path	O
during	O
the	O
initial	O
approach	O
,	O
instead	O
,	O
the	O
sight	O
has	O
to	O
be	O
stabilized	O
in	O
pitch	O
because	O
the	O
pilot	O
will	O
be	O
pulling	O
up	O
right	O
about	O
the	O
time	O
to	O
drop	O
.	O
</s>
<s>
Moreover	O
,	O
the	O
pilot	O
can	O
easily	O
adjust	O
for	O
any	O
cross-wind	O
visually	O
without	O
help	O
from	O
the	O
bombsight	B-Application
.	O
</s>
<s>
For	O
this	O
reason	O
,	O
a	O
low-level	O
bombsight	B-Application
simply	O
does	O
n't	O
need	O
the	O
same	O
sort	O
of	O
windage	O
correction	O
complexity	O
and	O
can	O
ignore	O
it	O
completely	O
in	O
most	O
cases	O
.	O
</s>
<s>
To	O
simplify	O
operation	O
,	O
all	O
of	O
this	O
was	O
carried	O
out	O
in	O
a	O
simple	O
mechanical	B-Device
computer	I-Device
.	O
</s>
<s>
This	O
system	O
was	O
originally	O
designed	O
for	O
the	O
Course	B-Device
Setting	I-Device
Bomb	I-Device
Sight	I-Device
,	O
and	O
reused	O
for	O
the	O
Mk	O
.	O
</s>
<s>
At	O
some	O
point	O
,	O
the	O
motion	O
of	O
the	O
lines	O
and	O
the	O
target	O
would	O
be	O
equal	O
and	O
the	O
bombs	O
would	O
be	O
released	O
by	O
pressing	O
a	O
button	O
on	O
the	O
end	O
of	O
a	O
flexible	O
cable	O
connected	O
to	O
the	O
timed	O
release	O
system	O
positioned	O
to	O
the	O
right	O
of	O
the	O
bombsight	B-Application
.	O
</s>
