Bauhaus-Universität Weimar

The Sciopticon Manual, Explaining Lantern Projections in General and the Sciopticon Apparatus in Particular Including Magic Lantern Attachments, Experiments, Novelties, Colored and Photo-Transparencies, Mechanical Movements, etc.
Marcy, L. J.
a lens, may help to correct the common impression that 
these properties and a convex lens are inseparable. 
Of the rays of light proceeding in all directions from 
every point in the object B, as from all illuminated 
objects, just an assortment, that is to say a pencil from 
each point will enter the hole at S, just in line to fall in 
reverse order upon the screen A, forming an inverted 
The picture results from admitting just an assortment 
and excluding all the rest. 
Light from each of the several parts of the object B 
illuminates with its peculiar color and relative intensity 
each corresponding part of the image, so that it is seen 
in natural light and shade, and in natural colors. The 
photographer can fix the relative shading, but ho cannot, 
as yet, fix the colors. 
If, for example, the bird moves to a higher porch, the 
pencils of light will fall to a lower place on the screen, 
and so any movement of the object which alters the 
direction of the pencils of light, will give a reverse 
movement to the image. 
By inspecting the angle of extreme rays it will bo 
seen that the imago in this case is smaller than the ob¬ 
ject, because it is nearer the aperture; so in all cases, 
the relative size of the image depends on its relative 
distance from the aperture.


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