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/lit39438/69/
Ch. I) 
SOME AMERICAN MAGIC LANTERNS 
61 
Fig. 35. Sectional View of an Arc Lamp and a Triple-Lens 
Condenser with Water-Cell. 
-|- W Wire going to the positive carbon. 
— W Wire from the negative carbon. 
He Horizontal or upper carbon ; it is positive. 
Vc Vertical or lower carbon ; it is negative. 
L The crater of the positive carbon ; it is the source of light. 
Cond 1 The first element of the triple-lens condenser. The meniscus is 
always placed with the concavity next the source of light. 
Cond 2 The second element of the triple-lens condenser. It is a plano¬ 
convex lens and should be of the same focus as the projection objective. The 
different lenses should be in the position shown in this diagram. Between the 
two convex lenses in the parallel beam of light is placed the water-cell. 
B, B, Blocks supporting the arc lamp and the condenser. 
Base The base-board with the track along which the different parts move 
(see fig. 40). 
Axis The principal optic axis of the condenser and continuous with that 
of the projection objective. 
Fig. 36 A. Magic Lantern with an Aitomatic Lamp and Inclined 
Carbons. 
(Cut loaned by P. Keller & Co., successors lo the J. B. Colt Co.). 
This lantern is very widely used. It has a two-lens condenser (see fig. 1). 
Its main defect is that every part, lamp, condenser lantern-slide holder and 
objective can be separately raised or lowered.
        

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