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
Ch. X] 
6. In drawing with any form 
of projection apparatus the 
axial ray must strike the draw¬ 
ing surface at right angles or 
the image will be distorted 
(§ 483). 
7. Make sure that the mirror 
or prism reflects the rays upon 
the drawing surface so that the 
axial ray is at right angles to 
the surface (§482-483). 
8. Use a condenser of suffi¬ 
cient diameter to fully light the 
object (§ 467. 533)* 
9. Get the desired size for the 
drawing by making the distance 
of the drawing surface greater 
or less, or by using a different 
optical system for the projec¬ 
tion (§ 465, 507-508). 
10. Take great pains to light 
as brilliantly as possible (§ 497, 
and Chapters I, II, and IX). 
11. Take care to have the 
images on the drawing surface 
erect (§ 512-526). 
12. In using projection ap¬ 
paratus for photography, re¬ 
member the principles of good 
projection, and the require¬ 
ments for good photography. 
6. Do not draw distorted 
pictures; therefore do not have 
the axial ray strike the drawing 
surface obliquely. 
7. Do not forget to incline 
the mirror used in drawing so 
that the axial ray will strike the 
drawing surface at right angles. 
8. Do not try to project an 
object larger than the diameter 
of the condenser lenses used. 
9. Do not neglect to give the 
scale at which every drawing is 
10. Do not expect good light 
unless the conditions for it are 
11. Do not draw inverted 
12. Do not expect projection 
apparatus to give good photo¬ 
graphs unless sharp, brilliant 
images are projected, and 
the photographic part is done 


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