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/lit39438/230/
Condenser 
222 
THE PROJECTION MICROSCOPE 
[Ch. IX 
I« 
Fig. i2i. Projection Microscope. 
1,2 Feeding screws of the arc lamp. 
j Set screw for the upper carbon. 
4 Set screw for holding the stem of the arc 
lamp in the socket on block I. 
5 Set screw for the lower carbon. 
IIc+ The horizontal, upper carbon. It 
must be made positive (+). 
L The source of light, i. e., the crater of 
the upper carbon. 
IV— The vertical or lower carbon. It is 
negative (—). 
Axis, Axis, Axis The principal optic axis 
from the positive crater of the arc lamp 
extending through the condenser, the stage 
water-cell, and the microscope to the screen. 
1 Condenser 2 The triple condenser for 
receiving and concentrating the light from 
the crater of the arc lamp. 
/ The first element of the condenser which 
renders the diverging light parallel. It con¬ 
sists of a meniscus next the light and a 
plano-convex lens (compare fig. 105, 111). 
2 The second clement of the condenser 
which concentrates the parallel beam. 
W Water-cell between the two plano-con¬ 
vex lenses in the parallel beam of light. 
As a projection microscope uses ob¬ 
jectives of shorter focus and smaller 
diameter than the magic lantern, 
greater care must be exercised in get¬ 
ting all the elements, radiant, con¬ 
denser and projection objective, cen¬ 
tered along one continuous line or 
axis, and in having the different ele¬ 
ments the right distance apart.
        

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