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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