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/lit39438/249/
Ch. IXl MICRO-PROJECTION WITH DIRECT CURRENT 
241 
falling upon them, and hence, following the law of the conserva¬ 
tion of energy, all this absorbed light is transformed into heat. 
The darker the specimen the more light is absorbed, and the quicker 
it will be spoiled by overheating. The stage water-cell against 
which the specimen rests conducts this heat away, in part, and 
makes it possible to exhibit the specimen a longer time (see § 852). 
Fig. 135. Mechanical Stage of Great Range. 
(Cut loaned by the Spencer Lens Co.). 
This can he clamped to any rectangular microscope stage and as no part of 
the clamp extends above the stage the full range of 85 by 65 mm. is available 
and slides 50 x 75 mm. (2x3 inches) can be examined to the edges. This is 
of the greatest convenience in examining serial sections, and also in projecting 
them on the screen. 
§ 368. Microscope-tube, and focusing device.—If a tube 
for receiving the objective is used it should be a large one, (fig. 
121, 145). The small tubes used on most microscopes, and on all 
when using an ocular, cut down the field too greatly (fig. 137, 147). 
The tube should be short, that is, about 9 to 10 cm. (4 in.) long, and 
4 to 5 cm. (2 in.) in diameter. There should be coarse and fine 
adjustments as for the ordinary microscope (fig. 121). 
§ 369. Mounting of objectives of low power.—For the lowest 
powers (125 to 75 mm. equivalent focus) it is better to have no 
tube at all, but to have a black shield about 15 cm. (6 in.) in diam-
        

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