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
ICe. X 
liable to cause confusion. If the mirror is silvered on the face or 
if a prism is used there will be no doubling of the reflected image. 
(8) Inverted images. One must follow carefully the directions 
or there is liable to be an inversion of the projected image (§ 512- 
(9) In printing and photographing with projection apparatus 
the difficulties likely to be met with in photography are sure to come 
in. Knowledge of the principles underlying photographic pro¬ 
cesses will help one to overcome the troubles. 
§ 549. Summary of Chapter 
i. Have a suitable room or a 
suitable shield around the draw¬ 
ing to keep out stray light 
(§ 453-455)- 
2. Draw in the evening if a 
proper room is not available in 
the day time (§ 453). 
3. Use an arc lamp for light 
if possible (§ 461-462, 486-487). 
4. Always use a rheostat with 
an arc lamp, large or small 
(§ 487, fig. 182, 185). 
5. One can draw images pro¬ 
jected by all forms of projection 
apparatus (§452). 
Do Not 
1. Do not try to draw with 
the drawing surface flooded with 
stray light. Only the light 
from the specimen should reach 
the drawing surface. 
2. Do not forget that it is 
dark in all rooms in the evening 
and, therefore, that is a good 
time to draw. 
3. Do not use a weak light 
for drawing if you can have an 
arc light. 
4. Never try to use an arc 
lamp, large or small, without a 
rheostat in series with it. 
5. Do not forget that it is 
possible to draw the images 
projected by any form of appar¬ 


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