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/lit39438/276/
268 PROJECTION OF HORIZONTAL OBJECTS [Ch. IX 
Projection of Horizontal Objects 
§ 397. As with the magic lantern, so with the projection micro¬ 
scope some objects must be left in a horizontal position for projec¬ 
tion. This requires that the microscope be in a vertical position. 
As the light source is for giving light in a horizontal direction 
(fig. i21), it is necessary to use a mirror or prism to reflect the 
horizontal light upward through the vertical microscope and then 
another mirror or prism above the microscope to reflect the vertical 
light horizontally to the screen. This is shown in fig. 147, 175. 
The ordinary mirror of the microscope serves very well for mak¬ 
ing the light vertical, but for reflecting it horizontally to the screen 
a prism or a plane mirror silvered on the face is best, as it gives a 
single image, not a double image as would the ordinary glass mirror 
silvered on the back. 
§ 398. Avoidance of stray light with a vertical microscope.— 
This is easily accomplished by using a vertical piece of blackened 
cardboard just beyond the microscope as shown in fig. 147. If 
light escapes from the sides one can use pieces of black cardboard 
or asbestos to enclose the microscope more completely. Ordi¬ 
narily, however, the single black shield beyond the microscope 
will answer. 
§ 399. Sample Objects Suitable for Projection with the Differ¬ 
ent Objectives (see also §3 99a). 
Photographic Type of Objectives (Micro-Planars, etc.) 
No Tube (fig. 138) 
Magnification with:— 
Object 
Size of Object 
Objective 
S Meter 
Screen 
7.5 Meter 
Screen 
10 Meter 
Screen 
Brain Section ...... 
55 to 90 mm. 
125 mm. 
39 
61 
80.6 
Cerebellum ami Brain 
Stem............ 
50 to 75 mm. 
100 mm. 
48 
74 
98.4 
Longitudinal Section 
of 40 mm. Embryo. 
35 to 50 mm. 
70 mm. 
72 
107 
143 
Section of Eve...... 
25 to 40 mm. 
60 mm. 
85 
123 
I68 
Section of Injected 
Kidnev .......... 
20 to 35 mm. 
50 mm. 
IOI 
147 
202 
36 Hour Chick Entire 
15 to 25 mm. 
35 mm. 
142 
210 
285 
Transection of Human 
Esophagus ....... 
10 to 20 mm. 
30 mm. 
167 
250 
330 
Appendix (Homo) . . 
5 to 11 mm. 
20 mm. 
253 
370 
495
        

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