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
9. If possible place the pro¬ 
jection apparatus at the back of 
the room (§612). 
i o. The axial ray of the image 
beam should strike the screen at 
right angles (§614). 
11. Incline the screen if neces¬ 
sary (§ 614). 
12. Light the black-board by 
lights behind a curved, metal 
shield (fig. 240). 
13. If a translucent screen is 
used the objects must be put 
into the apparatus with the pic¬ 
ture facing the objective (§516). 
14. Use a good screen (§ 621). 
15. If you use a mirror or 
metalliic screen remember that 
it does not reflect equally 
throughout the 1S0 degrees 
(§ 629). 
16. Make the screen image 
large enough so that the most 
distant spectator can see the 
details (§ 633, 639). 
9. Do not place the projec¬ 
tion apparatus in the middle of 
the room if it can be avoided. 
10. Do not let the axial ray 
strike the screen obliquely. 
11. Do not incline the screen 
unless necessary. 
12. Do not try to use the 
blackboard without lighting it 
by hidden lights. 
13. Do not forget the rules 
for erect images when using a 
translucent screen. 
14. Do not use a dirty screen. 
Wash it or give it a fresh coat of 
white paint. 
15. Do not use a mirror or 
metal faced screen in a square 
room ; such screens are not good 
for the fine details necessary in 
micro-projection (§ 360). 
16. Do not have the screen 
image too small nor too large.


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