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
than for a slide which is thin. Attention to the substage con¬ 
denser will make a great difference with one’s success. 
(4) The right-angled arc lamp should be used in drawing 
because if the microscope and lamp are properly arranged the source 
of light will remain in the axis no matter how long the lamp burns. 
If an inclined carbon lamp or one with both carbons in the vertical 
or horizontal position is used the source of light is constantly 
getting out of the axis from the burning away of the carbons, 
consequently they must be fed up more frequently to keep the 
source of light in the field. 
(s) The picture will be distorted unless the axial ray strikes the 
drawing surface at right angles. Therefore, in using a prism or 
mirror for a horizontal surface the microscope must be horizontal 
and the mirror or prism at 45 degrees to reflect the axial ray ver¬ 
tically downward. If the mirror or prism is twisted over to one 
side the axial ray will not strike the surface at right angles and there 
will be distortion. If one has a micrometer in squares it is easy to 
determine whether the image is distorted or not. 
(6) The image will be erect only when the object is properly 
placed on the stage. 
(7) If a glass mirror silvered on the back is used, and the object 
is quite opaque the secondary image reflected from the face is 
Fig. 220. Slide of Serial Sections with -a, k- on the Cover-Glass 
to Enable One to Determine when the Image on the Drawing 
Surface is Erect (See fig. 143, and § 512, 517).


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