Post on 01-Jun-2018
8/9/2019 TM 9-1662 Binaural Training Instruments M1 and M2 1941
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W A R
D
E P A R T M E N
T
9-1662
T
EC H N I C A L
MA N U A
L
j
O R D N A N C
E M A I N T E N A
N C E
B
IN A U RA
L TRA
ININ G
INSTR
U M E N T
S
M l
AND
M
2
July 8
, 1
941
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T
M
9-
166
2
1-2
TE
CHN
ICAL
MAN
UAL
N
o.
9-166
2
f
W
AR D
EPA
RTM
ENT
W
ASH
IN GT
ON
July
8
1
941.
O RDN A N CE MAIN TENANCE
BIN
U
R
L
TR
IN
ING
INS
TRU
ME
NT
S
Ml
N
D
M2
P
repar
ed u
nder dir
ection
ofth
e
h
ief of Ord
nance
S
E C T I
O N I.
Gen
eral
.
P a r a
g r a p h
P
urp
ose _
— _—
— _
_——
— _
——
——
——
——
——
—
1
Scope___________-___________—————
2
R
efer
ence
s___
___
____
__—
——
—
——
——
——
—
3
II
.
D
esc
ripti
on.
G
ener
al_—
___
_ _ _
_— —
_—
— —
—
— —
— —
— —
—
4
III
. Bin
aur
al trai
ning
in
stru
men
t M
l.
Op
era
tion
_
___
__
___
__
-—
___
—
——
—
5
Ins
pec
tion
—
_
___
__
__
__ —
__
——
_—
——
6
Ma
inte
nan
ce
an
d re
pai
r---
_—
__
___
—
—
__
7
I
V.
Bi
naur
al
t
rain
ing
ins
trum
ent
M
2.
O
per
atio
n_
__
___
__
___
__
___
__
__
__
8
In
spe
ctio
n
___
__
___
__
___
___
__
__-
_—
_
9
M
ain
tena
nce a
nd
r
epa
ir_
___
__
___
__
___
_
10
V.
Car
e a
nd pres
erva
tion
.
Pro
ced
ure
-_
___
___
__
___
__
___
___
__
_
11
Page
A
P P E N
D IX
. L
ist o
f
ref
ere
nce
s__
__
___
__
___
___
__
___
2
5
S E
C T I O
N I
GE
NER
AL
P
aragr
aph
Purp
ose_
____
___
____
___
____
___
____
___
____
___
____
____
___
____
1
S
cop
e-__
___
___
___
___
___
___
___
___
___
___
___
___
___
__
2
R
efe
renc
es _
___
___
___
____
___
___
___
___
___
___
___
___
___
3
1
. Pur
pos
e.—
Thi
s m
anu
al is p
ubl
ishe
d
p
rim
arily
for
th
e in
for
mat
ion
a
nd
gu
idan
ce
of or
dnan
ce m
ain
tena
nce
p
erso
nne
l.
2.
Scope.—This manual
supplements
the
Technical Manuals which
a
re
prep
ared
fo
r t
he us
ing a
rm.
I
t
con
tains
desc
ript
ive
mat
ter an
d
i
llus
trati
ons
suff
icien
t
to
p
rovi
de a
gen
eral
w
orki
ng k
now
ledg
e of
th
e
in
stru
men
ts
a
nd
d
etai
led
instr
ucti
ons
fo
r ins
pect
ion m
ain
tena
nce
and
rep
air
by
o
rdna
nce
ma
inte
nan
ce
pe
rson
nel.
32
3248°
—41—
——1
1
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T 9 1662
3 4 ORDNAN
CE DEPARTMENT
3. References.—The
appen
dix
list
s
the T
echnical Manuals and
Standa
rd Nomenc
lature
Lists for
the equipment described herein.
S ECTION
II
DESCRIPTION
Paragraph
General________
_________________________
_______
4
4.
Gen
eral.—The binaural training
instruments, Ml and M2,
are
desi
gned
as an
aid to
selecting
and training
sound-locator operators.
The operation
of these instruments is bas
ed
on the use
of phonograph
records which
closely
reproduce
the
sound
of
different
types
of
air
craft.
The
pho
tograph
tra
nscription e
quipment issued with the
Ml
instrument
is similar to the tr
anscription unit furnished with the
M
2
instrument an
d performs simila
r
functions. I
n
the
M
l
instru
ment, binaural sense
is introduced
by
a phase con
trol
unit
which di
vides and directs
the
s
ound to the
listener s
ears through
two separate
acoustic pat
hs.
In the M 2
instrument,
a
n additional fe
ature is
pro
vid
ed in that a movable sound source
may
be
employed in pl
ace
of
the
pha
se control unit to permit
training with
the
actual sound
locator under
conditions
which very
closely simulate tho
se of actual
air
craft
tracking.
This instrument include
s
the
transcription equipment, a phase
control
unit,
helmet, assembly,
and
accessories.
(1)
The source of
sound
is the tran
scr
iption equipment.
It
consists
essentially of
an
electrically driven
turntable
and
a magnetic pick-up
with
an impedance
matching net
work.
The different types
of
transcription
equipment as issued
with
instruments
of various
serial num
bers are
as
follows:
For
instruments, serial Nos. to 19, inclusive—RC
A turn
table
with uni
versal electric
motor
and
rubber-cushioned
pick-up.
. For
instruments, serial Nos. 20 t
o
25, inclusive—
Sonora
turn
tab
le
with
universal electric motor
and
Aud
ak electro-
chromatic pick
-up and arm.
For
instruments,
serial
Nos. 26
and
up—RCA
transcription
equipment,
type UZ4
21 0.
The
magnetic
pick-up, through an
impedance matching net
work,
i
s
connected
by a cord, assembly, B129354
(fig. 3), to the
receiver
and
cap, assembly
(fig. 2), of the phase con
trol unit.
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TM 9 1662
BINAURAL TRAINING INSTRUMENTS, Ml AND
M2
4
(2) (fig. 1).—The mechanical
phase
shifting
is
accomplished by
the
phase control unit.
The
sound
from the
receiver
and
cap, assembly,
enters the
wye, B129350
(fig. 3),
and
branches
into two
tubes,
B129352
(fig. 3),
one
on
the right and
the
other
on the left-hand
side of
the
receiver
and cap, assembly. The sound
in each branch
proceeds
through
a slide,
C44602
(fig. 2), into a tube,
B129351
(fig. 2), and finally
into
a
rubber
tube,
A38819
(figs. 1 and
11), which connects to the
helmet of the operator.
The operator's handwheel, C44601 (fig. 2), and instructor's
handwheel, B16521 (fig.
4), are both connected
by means
of
friction
couplings
to gears
of
a
differential
which
move
the
two
slides,
C44602
(fig.
2). As
the
slides are mutually connected
through the
differential, a given movement of
one
slide is accompanied by a
corresponding movement of the
other
slide in the
opposite direction.
The motion of
the
differential arm, B129348
(fig. 2), is trans
mitted to
the
slide
by means of the link, A38803 (fig. 2), and caps,
A38805 and A38806
(fig.
3).
The pointer, A38810 (fig. 1), which is attached to the cap,
B129349 (fig.
3),
projects
through a
slot on
the
front of
the instru
ment.
A
scale
is attached
above
this
pointer
on which
the error
from the
exact
binaural balance can be read directly.
Each division
on this scale corresponds
to 3.5 mils
on a
sound
locator
having
its
horns
110 inches apart.
(3) The helmet, assembly (fig.
5),
Signal
Corps,
type HAl,
modified
for
earpiece, is
used
with this equipment.
The helmet is fitted
with two
earpieces, B129378 (fig. 5),
one
for
each
ear.
Two rubber tubes,
A38819
(fig. 11), provide the connect
ing
medium between
the
earpiece of
the
helmet
and
the
phase
control
unit.
(4)
For a
list
of
accessories refer
to Z > 3 ) below.
This instrument includes
the transcription unit,
the phase control
unit,
helmet, assembly, and
accessories.
(1) The source of sound is
the transcription
unit (fig. 6). This unit consists
essentially
of
an
electric-driven turn
table,
a magnetic pick-up, cable reel
with
cable,
and
horn, assembly.
The electric-driven
turntable
(fig.
9)
is
provided
with
a
speed
adjustment to insure
satisfactory
reproduction of
the
record. The
output level
of
the
unit
can be
varied by means of
the volume
con
trol
(fig. 7) of the amplifier.
A
cable and
receptacle, assembly, B138121 (fig. 6), provides
the electrical
connection from the
transcription
equipment
to the
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TM
9 1662
4-5
ORDNANCE
DE PART M E NT
horn
(fig. 8). A reel,
C70338
(fig. 10), and crank, B138087,
are
provided
for
winding up the cable when it is not being used.
The horn,
assembly,
C70346
(fig.
6),
is
provided with
a
driver
unit and a bracket. Two pulleys are attached to the bracket to be
used for
moving the horn
along
the suspended cable or small rope.
A
compartment
is
provided
in
the assembly chest,
D29352, of
the
transcription unit to store the horn,
assembly, when it
is not being
used.
(2) The phase control
unit,
D43135
(fig.
11), and the helmet,
assembly
(D43139), for the
M2 instrument
are identical to those used
with
the Ml
instrument.
By
the installation
of
a
suitable
receiver
(par.
8
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T 9 1662
BINAURAL TRAINING
IN
STRUMENTS,
Ml AND
M2
5 6
6) The instru
ctor turns his handwheel a fixed
amount and permits
the operator
to reestablish
a binaural
balance. By watching the
poin
ter on
t
he
sc
ale, A38814 (fig.
1),
the
instructor can observe the
degree of
balance
which
has
been
obtained
by
the operator.
7) By
changing the
records on the
transcri
ption unit, the listener
may
be
taught to identify
the
various types
of
aircraft by their
sound.
(1 )
Disconnect the electric
power sour
ce
fro
m the transcription equipment.
2) E
emove
th
e pick-up from the
record. Place the record
in
to
the album.
3)
Kemove
the
cord,
assembly,
B129 354 (fig.
3), from the
phase
control unit
and tr
anscription equipm
ent.
4) Rem
ove the rubber
tubes from
the
instrument and wrap them
around
the helmet.
6.
I
nspection.—Inspection is for the pu
rpose
of determining the
condition
of
the
instru
ment, wheth
er
repairs or
adjustments
are
re
quir
ed and
the
remedies
necessary to insure servicea
bility
and proper
functioning. The
following
list
will serve as a guide:
To carry
out the following
inspections the
lid,
C44604
(fig.
1),
is
removed
from the
body,
D25605.
Pointer, A38810.
(1). Examine
the
pointer
for
any
loose
ness. The screws,
BCOX3DG (fig. 3),
should
be
kept
tight
at all
times.
2
) Slides, C44602. 2
) Turn
the handwheels to
the
limit of their travel
in either
di
rection
to
see
if
the
slides
move
freely on the tubes. If tubes
show
noticeable wear or
are bent
or
dented they shou
ld
be replac
ed.
3) Friction couplings of the 3)
When either of the hand-
ha
ndwheels. wheels is
turned there should be
no slip
page
but
when stops are
encountered
the
couplings should
per
mit
slippage
to prevent
dam
age.
Slippage under normal
op
erating
conditions in
dicates
tha
t
either
adjustment or
replace
ment of parts in
the
couplings is
necessary.
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TM
9 662
6 7
OR
DNANCE DE
PARTMENT
4)
Gear, A
38794, and
worm
4)
Turn
either of the t
wo
whee
l,
A
38796.
handwheel
s
slowly
in
one
d
irec
tion
and
then
in
another. By
observing
the
pointer,
A38810
fi
g. 1), on
the scale, the
back
lash
in the gears c
an be not
iced;
if ap
preciable, the
gears must
be
repla
ced.
5)
Receiver,
as
sembly. 5)
The
receiver
fig.
2)
sho
uld
fu
nction without r
attling. If it
does
not f
unction satisfa
ctorily,
replace
the
receiver.
6
) Eubber
tubes
from th
e
6
)
Examine the
rubber
tube
operator s
helmet.
for
cracks or breaks.
If
these are
no
ticed the t
ubes should be re
pla
ced.
bina
ural
trai
ning
inst
rument,
M
l, is fu
rnished with
diffe
rent types of tran
scription
eq
uipment
(par.
4
a l)
For an
in
spection of
any of th ese
types
,
th
e
following
w
ill
serve
as
a g
uide:
1)
Turntable moto
r.
1)
The motor
shoul
d
run
withou
t overhe
ating and
turn the
turntable
at
a
co
nstant speed of
78
revolution
s
per
minut
e
as
me
as
ured
by
a
suitable
speed m
easur
ing device.
If speed is
not satis
fac
tory after adj
ustment
(where it
is
provided),
the
motor
should
be
rep
laced.
2) Pi
ck-up arm.
2)
The s
ound re
produced
should
be c
lear without distortion
and
of
sufficient
intensity.
3)
C
onnecting cabl
es, plugs 3)
Examine
th
e
p
lugs and
and
ja c
ks.
jac
ks
to
see if
the cont
act
springs
make firm
contact. T
he cables
should a
lso be examined.
If the
insulation
is
badly
cra cked
or
worn,
the cables
should
be
re
placed.
7. Maint
enance and repa
ir.—The
assembled
and section
ed views
s
how
the location of the
variou
s
parts
an
d
t
he
means
by
which the
y
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T
9
662
BINATJRAL TRAINI
NG INSTRUM
ENTS, l AND M2
7
are held in
place. These
figures sh
ould be
carefully
studied before a
t
tempt
ing
a
ny
a
ssembling or
disassemblin
g operation.
Fo
r the following opera
tions the lid,
C44604
(fig.
1),
is
removed
from
the
body,
D25605.
After
completion
of the
op
eration the
lid
is
to be
replaced.
(1)
(sec
.
A-A
-A-A-A-A,
fig.
2).—
Remov
e the c
ap, A38806
(fig.
3), by
removing the
two
nuts,
A35566A, an
d associated
screws.
Push the
link
, A3
8803,
awa
y
from
the
slide
and gra
sp the
slide
with one han
d and
pull
horizon
tally to the left (f
ig. 2) u
ntil
it clears
the tubes, B129352
(fig. 3). Then pull
up, thus remo
ving t
he
slide
from
the instrument.
2)
Remove the two
w
ires
fr
om the phone
jack.
T
wist
the tube, A38818 (fig.
2),
sligh
tly
and p
ull
horiz
ontally to
the left un
til
clear
of the
w
ye,
B129350
(fig.
3
), then
lift
up
on
the receiver. When
assemblin
g,
care sh
ould b
e
exercised to have
the
rubbe
r tu
be, A38818,
make a tight
c
onnection
b
etween the receiver and wye.
(3)
Remove
the
instructor handwhe
el, B16521
(sec.
G-G,
fig. 4),
to
gether with
the
adapter,
A43159,
by
removing
the
three
screws,
BCLX3DD.
Remove the fla
nge
nut,
A431
58.
by
first loosening the
ada
pter
screw, BCUX
1ED.
Extract
the flange
compressio
n
spring,
A43157. Drive out the;
flange,
taper
pin.
Extract
the
flang
e, A43155,
with plate A43156.
4)
Since the
d
isassembly oper
at
ion for the right
and left arms,
B129348
(se
c. B-B-B-B, fi
g. 2), is
simila
r, only
the procedure fo
r disassembli
ng the left
a
rm
will be
given.
Drive out the
pin,
BFCX1L
(sec.
D-D,
fig.
4),
and
push the
shaft, A3880
8
(fig. 2)
several
inches to th
e right.
Rem
ove
the
link stud, A38804 (
fig. 2), by first
removing t
he
cotter pin, B
FAXlBD, then
push the link towa
rd the
base plate
( -2).
Re
move
the
gears, A38794
(sec. E-E, f
ig .
4),
by remov
ing
th
e
two nuts, B
BAX1A, w
ith associate
d
w
ashers and d
riving
ou
t the
studs, A38795.
Remove the
four
nut
s,
A3
5566A,
and associated
washers
f
rom,
the
brackets, B129345
and
B12 9346
(sec.
B-B-B-B,
fig.
2).
Firmly
g
rasp
both
brackets
with
one hand
and with
the
other
pull toward
t
he
right
about 1 i
nch
or
enough to fre
e them
fro
m the
projecting
bolts, then
lift up vertically and
carefully
remove them from
the
instrument.
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TM 9-1662
7 8 ORDNANCE
DEPARTMENT
e)
Access
can be had
for
di
sassembling the
worm
wheel
sha
ft,
A38799,
diffe
rential arm an d
associated parts if necessary.
5)
The procedure
to be followed for
reassembling
is
the
same
as for
disassembling
except
in
the
reverse
order.
Three different t
ypes
of
transcrip
tion equipment
are
is sued with this
instr
ument. No detailed
instruc
tions
relative
to
the repair and
maintenance
o
f any
one
type
are
give
n.
By
examinin
g the equipm ent,
the
procedure as
well
as
t
he screws,
nu
ts, etc ., necessary to
be removed for
the
replacement of
defective
parts can
readily be determ ined.
S E C
T I O N
IV
BINAUKAL
TRAINING INSTRUMENT,
M 2
Paragraph
O
peration______________——__—____—
__———————————
8
Inspection _________
___ — — — — _ — — _ _ — — — _
_ _ — — — — — — — — — — —
9
Maintenance and
repair__
_ _ — — — — — — — ———_ _ _ _ ——_ _ ——————
— — — - — —
10
8.
Operation.—In connection
with
the
operating procedure, ref
erence
should
be
made
to
figures
6
and
7 .
1)
Set
transcription equipment on an object of
convenient
height and open the lid of
the chest, assembly, D29358
fig. 6).
Remove the
horn, assembly, C70346 fig.
6), from
the
chest.
Suspend it from a steel cable or small
rope
which
has
previously
been strung between two poles or
trees. Plug in the cable
and
recep
tacle, assembly
,
B1381
21 fig.
6),
fro
m
the
binaural training in
stru
ment,
M2,
to the
horn,
assembly,
C70346
fig.
6).
c) Plug the cable, B138073,
into a 110-volt, 60-cycle a. c.
power
source, place
the
desire
d record on th
e turntable, and turn the
motor
swi
tch
on .
Place
a ne
edle in the pick-up
and
clam
p
it
firmly
with
the
clamp prov
ided.
Pla
ce
the pick-
up on the
record
and turn the ampli
fier switch,
on.
Set t
he
output leve
l
as
required
by
means of the volume-contr
ol
kn
ob .
/)
Place the listening station in the
immediate vicinity where
the sound
intensity
is
sufficiently
high. The
suspended
horn can be
moved to
different positions along
the cable. The listeners track the
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TM
9 1662
BINAURAL TRAINING INSTRUMENTS,
Ml
AND M2 9
target with their horns and corrector operators perform
duties
exactly
as
when
tracking
an actual airplane.
(2)
Place
the
transcription
equipment
on
an
object
of
convenient
height and open the
lid of the chest,
assembly,
D29358 (fig. 6).
(&) Plug the
power
cable, B138073, into a 110-volt, 60-cycle, a. c.
power
source.
Place the desired record
on the
turntable
and
clamp
a needle into the
pick-up.
Plug the cord,
assembly,
B129354 (fig 3), into
the
output
jack
of
the transcription equipment.
Follow the
procedure given in paragraph 5a(5) to (7).
Phase control units employ different types of receivers to prop
erly
match the transcription units with
which
they
are
used.
When
first placing a phase control unit into service, it
is advisable
to verify
that the
proper
receiver has been installed. The receivers to be
used
are
as
follows:
Western Electric
Co.'s No.
528
type
rteceiver for
use with
turntables,
UZ4210 and
4814,
with AZ4211-2
pick-up.
0. Brandes Superior type receiver for turntables
other
than
UZ4210
and
4814 with AZ-4211-2 pick-up
and
Green
Flyer
turntable.
Trimm, Featherweight (24,000 ohms) receiver for
Green
Flyer
turntable for
use
with
binaural training instrument,
M2, only.
(1)
Turn the
motor and
amplifier switch
off
and
remove the
cable, B138073, from
the
power source.
(&)
Remove the
pick-up
from
the
record.
Remove
the needle from
the
needle
clamp.
)
Remove
the
record
from the turntable and
place
it
in the
album.
Remove the
horn,
assembly, from
the
suspension cable;
dis
connect the cable
and
receptacle,
assembly,
B138121 (fig. 6), and place
the horn into the
proper
place
in
the
chest.
(/) Wind up on
the
reel, C70338
(fig.
10), the cable connecting the
horn and transcription
equipment.
Close
the
lid
of the chest.
(2)
Follow the
procedure
given
in paragraph
56(1)
to
(4).
9.
Inspection.—Inspection
is
for the purpose
of
determining the
condition
of
the
instrument, whether
repairs
or adjustments are
re
quired,
and
the
remedies
necessary to insure
serviceability and
proper
823248°
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T I K E 9-1663
9-11 ORDNANCE DEPARTMENT
functioning. In addition to the inspections given in paragraph
65,
the
following should also
be
made:
Volume
control.
Gradually
increase
the
vol
ume by
operating
the volume con
trol over the usable
range. The
output
of
the
horn
should increase
in uniform steps.
Scratching
or
dead spots indicate
a
defective
volume
control.
Z > . Contact springs A45869 The contact springs should
(fig.
10).
make
good
contact
on
the
rings,
A178173 and A178174,
as
the cable
reel,
C70338, is being revolved.
If the output level does not stay
constant
as
the
reel is
rotated,
the
springs
should
be
replaced.
10. Maintenance and repair.—The transcription unit furnished
with the binaural
training
instrument,
M2, will require little mainte
nance.
If
a unit fails
to function
properly
it should be
replaced.
(fig.
8).—
(1)
Dis
connect
the electrical
connections from the driver unit (fig. 8)
and
remove
the
two nuts, BBCX1C,
on
opposite
sides of the
horn.
Remove
the bracket, assembly, B138096,
from
the
horn.
(2) Pull up
on the driver
unit and
carefully
remove
it
from
the
horn.
(fig. 9).—(1) Remove the
plug from
the
input
jack. Remove the screws and clips holding the cable
and
plug,
assembly,
B138077,
to
the
turntable
plate.
(2)
Carefully
remove the pick-up by
removing
the three screws,
BCNX3DN, by
which it is secured
to the
turntable plate, C70339.
The procedure to
be
followed for re
assembling
is the
same
as
for
disassemb ling except
in
the
reverse order.
S E C T I O N V
CARE AND PRESERVATION
Paragraph
Procedure_______________________________________ 11
11. Procedure.—
(1)
The nuts and
screws holding
the
various parts of
the
phase control
unit
and
transcription
equip-
10
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T
9 663
BINAURA
L TRAINING INSTRUMENT
S,
l
AND M2
ment should
be kept
tight at all times
to insure satisfac
tory ope
ration
of the e
quipment.
2) When
the transcriptio
n equipment
is
not
being used th
e
cable
and
receptacle,
assembly,
B138121
fig.
6),
should
be
disconnected
from the horn
and wound
u
p
on
the
re
el provid
ed
and
the ho
rn,
ass
embly, placed in its pro
per plac
e
in the chest.
3) Car
e should
be
exercised to keep
the connecting
cab
les an
d
ru
bber t
ubes
free f
rom oil
and
grease.
Any grease sh
ould be
r
emoved with
a
cloth moistened
with
ethyl
alcohol.
4) Car
e should be exercised w
hen plugging
in the phase
control
unit
of the binaural
training
instrument, Ml, to the
transcript
ion
equipmen
t of the M 2 instrum
ent th
at
the
plug is
p
ut
in
the output
jack shown in figure
7.
5) The
loud spea
ker cone of the
horn,
assem
bly, w
ill warp if
subjected to excessiv
e humi
dity. The equipment
should therefore
no
t
be used
in
the
rain,
and the
horn,
assembly,
should not
be
left
in the
open overnight.
6) Th
e
re
el contact rin
gs fig.
10
) sho
uld
be kept
c
lean and
free from oil at all tim
es; if neces
sary, they
sh
ould be
cleane
d with
fine flint
paper.
In
the
following procedure
when
oil
is specified,
oil, lubricating,
for airc
raft instruments an
d
ma
chine guns
U.
S. A.
Spec.
2—27
is
to
be used,
and
wher
e grease
is
specified,
grease,
special,
l
ow tempe
rature Eo
yco 6A), is to
be
used.
1)
T
he
tu
rntable
motor
must
b
e
oiled perio
dically
with
a few
drops of oil
through
the oilholes
located und
erneath the turnt
able.
2)
At freque
nt
inte
rvals
the
bearing
s of the instructor
and
oper
ator han
dwheel shafts
sho
uld
be
lubricated with a few
drops of
oil.
These
bearings are provi
ded with
oil
holes.
3)
The
gears
and
arms of
the
mechanical phase
control apparatus
should b
e periodical
ly
oiled to
insure smoo
th and qu
iet
operat
ion.
4
) The worm
wheel shafts,
A38799
and
A38800,
should
be
oiled at
frequent
interv
als.
Oilho
les are
provided
in
the s
haft
b
rackets.
B1
29345, B
129346, and B129347
fig. 2),
for this
purpose.
5) Occ
asionally
the
p
illow blocks
of
t
he cable reel, C70338
fig.
10), should be
oiled with a few
drops o
f oil
through
the
oilholes
provided
.
6
) The
s
lides,
C44602 fig. 2),
should
periodically
be
given a
light coating
of
grea
se.
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TM
9-1
66S
BINATJR
AL TRAININ
G INSTRUMEN
TS, Ml
AN
D M2
11
NUT A35566A
MESHES WITH
A3B794
SECTION E E
SHAFT A38800
MESHES WITH
A3879T
SECTION
FIGURE
2.—Binaural
trai
ning instrument
Ml
or
M2—phase co
ntrol unit sectioned view
s.
See
fig. 3 for lo
cation
of
section plane
s
A-A-A-A-
A-A
and
B-B-B-B
sees. D-D, F-F
and
G-G are shown on f
ig.
4
.)
1
3
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TM
9-
166
2
O
RDN
ANC
E
E
P R
TM
ENT
SECT
IO N
A -A
-A-A -A
-A - L-PI
N- B FA
XI B D B
LOCK
.A388
I6
TOR GREEN
FLYER
TU R NT
A BL E
BINA UR
M. TR A M
ING IN STRU
M EN T. »ZO
TJ
V /
®«FO
RTU»ra
BLES
OTHER
T HA N ®ANO
SE
CTIO
N C -
C
R
A F
SD
405
F
IGUR
E 2.
—Bi
miuru
l
trai
ning
ins
trum
ent
Ml
or
M2—
pha
se co
ntrol
un
it
sectio
ned
view
s— C
onti
nued
.
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T 9 663
BINATJRAL TR
INING INSTRUMENTS l
AND
M2
5
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T 9 1662
O
RDNANCE
DEPARTMENT
I
16
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TM 9 1662
BINAURAL TRAINING
INSTRUMENTS,
Ml AND M2 11
17
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TM
9 1662
ORD
NANCE DEPARTM
ENT
18
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BINAURA
L
TRAINING
I
NSTRUMENT
S,
Ml
TM
9 1
663
AND M
2 11
8
HO L
ES
.136
N O .
29 DR I L L
WHEN ASSEM BL I NG .
RECEPTACLE
OU
TPUT
J ACK OUTPUT
J A C K , INPUT
GR ILLE
RA FSO 252
9
F IQHKB
7
.—Blnnural
training
instrument, M
2—amplifier, asse
mbly.
9
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F
G
U
R
8
—
n
a
a
n
n
n
u
m
M
—
n
a
m
y
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T
M
9-
1
6
62
B
IN
A
U
RA
L
T
R
A
IN
IN
G
IN
ST
R
U
M
E
N
TS
M
l
N
D
M
2
21
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TM
9 1662
ORDN NCE
DEPARTMEN
T
cl
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BINAU
RAL TRArNING
INS
TRUMENTS
TM
9 1662
Ml
AND M
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TM 9
662
BINAURAL TRAINING
IN
STRUMENTS, Ml AND M2 App
APPENDIX
LI
ST OF REFERENCES
1.
Standard
Nomenclature List
s.
Instrumen
t, binaural training,
l_____ SNL
F-121.
Instrument,
binaural
train
ing, M ______
SNL
F 198
.
2.
Technical Manuals.
Cleaning and
preserving
materials_______
TM
9-850
now
pub
lish
ed
as
TR
1395
-
A).
Materiel
inspection
and repair________
__ TM
9-1100.
Instruction Gu
ide, binaural
training
instru
- TM 9-2662.
ments , Ml and
M 2.
[A.
G . 06
2.11
5-14-41).]
BY ORDER OF THE
SECRETARY OF WAR
G.
C. MARSHALL,
OFFICIAL,
E.
S. A D A M S ,
DISTRIBUTION
B
4 3); IR
4 2);
Bn
9 4);
1C
4 2), 9 6).
For
exp
lanation of symbols, see FM 21-6.)
25
a
S GOVERNMENT
PRINTING OFFICE;
1941