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
An experiment with the iris partly closed and then wide open will 
show the necessity of observing this rule. 
The microscopic slides should be in order and properly masked 
(§ 384) and marked in some way so that the operator can tell which 
edge up they should be placed on the stage. 
It is also a great advantage to have marked on the microscopic 
specimen the objective or objectives that should be used in pro¬ 
jecting it to bring out the structural details which it is desired to 
Fig. 149. Slide Box to Hold Preparations for Demonstration. 
(Cut loaned by the Spencer Lens Company). 
For ease in getting hold of the slides to be exhibited, either a 
shallow tray can be used or a slide box (fig. 148, 149). As with 
lantern slides, it is advantageous to have the microscopic specimens 
so placed that they can be grasped easily, and put on the stage as 
desired without hesitation. 
Some teachers, including the senior author, have found it 
advantageous to manage the projection themselves, giving the 
explanations from the position of the lantern. 
The best way to point out the parts in the screen image to be 
especially noted is to have a slender pointer about two meters (six 
feet) long, like the upper two-thirds of a bamboo fishing rod, and 
to hold this out in the beam of light. The shadow appears on the 
screen sharply, and one can point out details with the same clear¬ 
ness as by using a pointer on the screen. It is easier also, because 
the speaker does not get his eyes dazzled by looking into the light 
beam, as so often happens when standing near the screen in the 
usual lecture position. 
Special Demonstrations with High Powers 
§ 401. Substage condenser in projection.—As indicated in 
§ 359 the authors of this book believe that projection for large 
audiences and with low objectives is best accomplished without


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