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/lit39438/150/
142 
HELIOSTATS FOR THE MAGIC LANTERN 
[Ch. VI 
to turn the mirror around in a circle on its axis, and as a screw by 
means of which it is raised or lowered on its hinges (fig. 75). 
§ 235. Setting up the hand-regulated heliostat.—The appara¬ 
tus must be so placed that it receives the full sunshine on the 
mirror. 
In the forenoon an eastern exposure can be used, and in the 
afternoon a western one ; * or a southern one nearly all day. In 
practice a person will naturally use the window best adapted to his 
particular needs if he has a choice. 
Fig. 75a. Solar, Projection Microscope of Adams, with 
Porte-Lumière. 
{From Adams' Essays, 1771, PI. VI). 
Fig. 4 shows the movable mirror (K-L) placed outside the shutter in the sun, 
O-P, screws in the square plate to fasten the instrument in the shutter; M-N\ 
thumb screws by which the mirror is turned to hold the sun’s rays in the right 
direction. The large tube, A-C-D, contains the condenser and receives the 
shorter tube, fig. 5. Fig. 5 shows the tube into which the objectives are fixed. 
If for large objects the lens (fig. 6) is screwed into the end, g, for smaller objects, 
the objectives are arranged in a piece (fig. 8) sliding into the opening at q. 
Notches along the objective slider indicate when the lens is centered. The 
specimen to be examined is inserted at h. For high powers the substage con¬ 
denser shown at fig. 7 is put in the tube between d-h. At 6 is a rack and pinion 
for focusing the object.
        

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