User manual
Gun  Camera-Mark  I 
GENERAL: 
Gun 
Camera 
Mark 
I. 
has 
been  developed  for 
the 
purpose  of 
i~creasing 
the 
efficiency  of  aerial 
gunnery 
By 
its use a graphic record of 
the 
manner 
in which 
the 
student-aviator 
handles  his  machine 
gun 
in  offensive 
and 
defensive 
combat 
is 
obtained, 
his faults discovered 
and 
corrections made possible. 
This 
apparatus 
is 
mounted in place of 
the 
maga-
zine  on a  Lewis aerial gun equipped with 
post 
fore 
sight 
and 
ring 
rear 
sig
hts 
and 
is 
operated 
by 
simply 
sighting 
the 
gun 
and 
pressing 
the 
trigger 
The 
cam-
era 
uses 
standard 
moving  picture  film, 
takes 
the 
pictures  automatically  as  long  as 
the 
trigger 
is 
depressed 
at 
the 
rate 
of  six 
per 
second, with-
an 
ex-
posure of 
0\-second, 
and 
its magazine holds sufficient 
film for 97 exposures, this 
number 
being 
the 
same 
as 
that 
of 
the 
cartridges in 
the 
Lewis  four 
tier 
maga-
zine. 
Each 
exposure 
thus 
represents a  single 
shot 
of a Lewis 
gun 
and 
the 
films  are  marked  according 
to 
bur
st
s. 
The 
magazines  are  changed  in  exactly 
the 
same 
manner 
that 
the 
drum 
magazines  of 
the 
ordinary 
gun 
are  replaced, 
and 
each 
gun 
camera 
outfit 
is 
supplied  with  a 
total 
of 
three 
film  maga-
zmes. 
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