Specifications

3.
Utmost reliability
because...
The sound
proiectors
5-211 and
5-221
show infinite
care in
every
component,
the
observance
of microscopic
tolerances
and
a carefully
planned
design down
to
the
minutest
detail.
Materials
of chosen
qua-
lity
guarantee
heavy
duty
performance.
The
main
components
are
permanently
adjust-
ed.
All
projectors
have
to
pass
exhaustive
tests
during
and
after
assembly.
Here are three specific, significant
exam-
ptes
of care
in
production
and main
parts
control:
The film
gate
and
pressure
plate
have
to be cor-
rected, machined,
polished
and mounted with the
highest degree of accuracy
justified
by the limited
depth of focus of fast
projection
lenses.
The claw
is
made from extra-hard
chrome-plated
tempered
steel.
lts
cam
is
milled to a tolerance
of
0.0002" or one twelfth ol the diameter
of a hair.
The claw is tested
in
the
"life
test" laboratorv
during a 1,000 hour test run at24 f.p.s.
represent-
ing
almost 90 million claw movements.
Examina-
tion
must not reveal any trace.of wear.
Even
greater precision,
of an order of 0.00004"
or one
sixtieth o{
the
diameter of a hair, is
observed
for
certain
parts
of
the
magnetic
sound
head. All heads have to undergo
final electronical
testing
of high standards.
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fi
7e,&
ft''.f.'&
Assembly of l
the sound heads.