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Connecting
pradovit-f
with universal
Motor
for
110
-
240 V and 50
-
60
Cycles.
The voltage
and
cycle
selector
is fitted
at
the
bottom
of
the
instrument
and
can
be
seen
after
unscrewing
the bottom-panel.
The
sett-
ing
for
the
various
voltages
is
done
as
follows:
1.
Losen
screw
with
screw-driver.
2.
Turn
the Pertinaxplate
so that
the desired
voltage
+
cycle
nomination
stand
oppo-
site
each
other
as
for
instance
in the illu-
stration
50 cycles, 220 volts.
To set
the
frequencey
to 50 or 60 cycles,
both
screws
holding
the rectangular
Pertinaxplate
of
the
transformer
are
losened.
The
rectangu-
lar plate
is then shifted
so
that
the required
number
of
frequency
stands opposite
the cor-
responding
voltage.
10479 -31
The
interchangeable
Lenses
You
can change
the
LEITZ projection
lenses
from
90 mm to
120
mm focal
length
on
the
pradovit
without
adjustment
of
the
condenser
system.
For
longer
focal
lengths
a
different
lens
tube
and
movable
condenser
are
re-
quired.
16
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