Bauhaus-Universität Weimar

Optic Projection: Principles, Installation and Use of the Magic Lantern, Projection Microscope, Reflecting Lantern, Moving Picture Machine
Gage, Henry Simon and Henry Phelps Gage
W 8 The wire to the left lamp, lower carbon. 
W 6, W 7 Wire including the rheostat, passing to the upper carbon of the 
left arc lamp. 
L Rheostat Rheostat for the left lamp. 
r 3, r 4 The binding posts of the left rheostat. 
L Lamp The left arc lamp. 
F Feeding mechanism for the carbons. 
cl Clamp for fixing the arc lamp in any vertical position on its standard. 
s s Set screws for the carbons. 
II C Horizontal or upper carbon. 
V C Vertical or lower carbon. 
R Rheostat Rheostat for the right arc lamp. 
r 1, r 2 Binding posts for the rheostat. 
W 4 Wire from the switch through the right rheostat to the upper 
carbon of the right arc lamp. 
IF 5 Wire to the lower carbon of the right lamp. 
R lAimp The right lamp. It is exactly like the left one. 
L Lamp, R Lamp The arc lamps for the two projectors. ■ 
Condensers The triple-lens condensers with water-cells for the two pro¬ 
Axis, .4:m, Axis, Axis Principal optic axis in the two projectors. 
P Objective The projection objective at the left. 
Microscope The projection microscope at the right. 
Screen Image, Screen Image The images formed on the screen by the two 
Noth.—In using these projectors it is only necessary to tum the switch 
handle over to the one desired and that lamp can be lighted. One can tarife 
from one to the other at will. 
A more economical arrangement would be to have a single rheostat inserted' 
along c ither IF/ or IF2 before reaching the knife switch, then the single rheostat? 
would serve for both lanterns. 
With the two rheostats, as here shown, both lanterns could be run at tfte 
same time if there were two switch handles and double blades hinged at tte 
center {II 1, II 2). 
The projection microscopes in the open market rarely possess, 
anything like this range. Very few will project an object as great 
as 25 mm. in diameter. 
It seems to the writers of this book that the makers have unduly 
limited the range of their apparatus by a too rigid insistence on the 
use of substage condensers and projection oculars, and also by the 
effort to make combined apparatus. Combination always means 
compromise and more or less toss of individual efficiency. 
It is certain, too, that most of them have not fully appreciated 
the necessity for dull black surfaces. The bright finish is probably 
to please the eye when the apparatus is not in operation. It 
certainly is not good for the eyes when the apparatus is in opera¬ 


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