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10430-31
Centering the Projection
Lamp.
For centering
the
projection-Iomp
insert
the
pinhole
slide
into
the
film
gote.
The
filament
of
the
reflected
image
is
observed
by holding
a
white
piece
of
po per
in front
of
the
pro-
jection-lens.
The best position
'can
easily
be
obtained
by
turning
the
centering
screw
as
shown
in
the illustrotion.
The above
illustration
of
the
image
represents
the
ideal focusing
for the
pradovit-f.
With
the
double
image
of the filament
it is aimed
to
get
as
a homogeneous
field
os
possible.
With
the low
voltage
lamp
for
the pradovit-n
the
reflected
image
must
be
seen
exactly
obove
the
lamp
filoment.
12
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