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/lit39438/149/
Ch. VI] HELIOSTATS FOR THE MAGIC LANTERNJ 141 
ported by a framework. This frame should be hinged so that it 
can be moved from the horizontal up to the vertical position. It 
must also be so mounted that it can be rotated around at right 
angles to the hinge motion. 
Fig. 75. Porte-Lumière with Plano-Convex Lens and Projection 
Objective. 
(Cut loaned by the C. H. Stoelting Co.). 
The mirror for the reflection of the sunlight into the condenser is moved as 
necessary by the milled head just above the condenser. 
The two movements are made by hand as often as needed while 
one is using the apparatus. In the original forms of Cuff and 
Adams (1744-1746, fig. 75a), and in some modem forms, there are 
two handles or milled heads extending into the projection room; 
with one of them the operator can raise or lower the mirror on its 
hinges, and by the other he can rotate it on the other axis. In the 
form here shown there is but one handle. This serves as a crank
        

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