Bauhaus-Universität Weimar

Titel:
Optic Projection: Principles, Installation and Use of the Magic Lantern, Projection Microscope, Reflecting Lantern, Moving Picture Machine
Person:
Gage, Henry Simon and Henry Phelps Gage
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit39438/419/
Condenser 
Cb-KI] 
OPTICS OF MOVING PICTURES 
411 
get a good light on the 
screen must now be taken. 
The moving picture head 
as it comes from the fac¬ 
tory should have the 
aperture plate and the 
center of the objective 
mount at the same 
height. If they are not, 
the aperture plate must 
be moved up or down 
until its center is on the 
same axial line as the ob¬ 
jective. The adjustment can prob¬ 
ably be done with sufficient accuracy 
with the eve, when looking through 
the lens opening, the lens being in 
place. This is a matter which al¬ 
ways should be looked after by the 
manufacturer. 
Another method would be to re¬ 
move the condensers and adjust the 
arc lamp to exactly the same height 
as the aperture plate. A piece of 
paper put in place of the lens 
should, when the arc is lighted, 
show the shadow' of the center of 
the aperture plate in the exact cen¬ 
ter of the circular piece of paper. 
Fig. 228. Optical System and Illumin¬ 
ation of Movin'«: Pictures. 
Lamp. 
Condenser. 
.V Lantern-slide holder. 
Fire Shutter This is open only when 
the machine is running. 
s Aperture plate. 
Objective. 
See fig. 231 for full explanation of the 
mechanism.
        

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