Volltext: Optic Projection: Principles, Installation and Use of the Magic Lantern, Projection Microscope, Reflecting Lantern, Moving Picture Machine

Ch. I] 
exceeded in every way by the moving picture that it is hardly worth 
while to go to the trouble to get together the apparatus and slides 
to show these small “effects” when such wonderful ones are shown 
daily in every moving picture theater. 
The moving picture was originally invented to illustrate scientific 
facts; and the indications now are that it is to become a great 
factor in education by its striking portrayal of the processes of 
nature. (SeeCh. XI). 
Stereoscopic Screen Images 
§ 50. For a stereoscopic screen image the same fundamental 
law must be observed as for any other stereoscopic effect. That 
is, there must be two slightly different images corresponding with 
the image seen by the left eye and that seen by the right eye. 
These images must be projected on the screen so that they nearly 
coincide, then by some means the left eye sees its left-eye image, 
but not the right-eye image; and the right eye sees the right-eye 
image, but not the left-eye image. The two images are then 
combined in the brain and the stereoscopic effect follows as with 
ordinary naked eye binocular vision or when using a stereoscope. 
With the magic lantern this effect has been produced in three 
principal ways: 
(1) By the aid of prism spectacles.—Lantern slides of a stereo¬ 
scopic pair are projected on the screen so that they nearly coincide 
by the use of two lanterns. When this is done some people can 
get the stereoscopic effect by looking at the'pictures with the naked 
eye, but for most people it is necessary to look through prism 
spectacles so that the right eye shall see only one image and the 
left eye only one. 
(2) By the aid of polarized light and Nicol-prism spectacles.— 
According to this method two lanterns are used and two lantern 
slides, making a stereoscopic pair. For one lantern there is used a 
Nicol-prism or a glass pile and the projection is made with the 
ordinary polarized light. A similar prism or pile is used for the 
other lantern, but the extraordinary polarized light is used for 
projecting its image. These two images are projected so that they


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