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. XI] 
supplying the power. Some power companies object to the use of 
an inductor (choke-coil). In such cases a transformer can be used 
§ 563. Stand or table.—A stand or table is provided by the 
makers of the machine. The method used to set up the stand will 
be fairly obvious from the illustrations furnished by the makers of 
the particular machine used. Generally this stand is made of 
brass tubes. One maker provides a heavy iron pillar. With this 
make provision must be made to anchor this pillar firmly to the 
If the machine is to be installed permanently, it is often better to 
use a stand constructed of concrete or a very heavy wooden table 
instead of the light stand regularly supplied. A very slight motion 
of a rickety stand will cause an enormous movement of the picture 
on a screen 15 to 30 meters (50 to 100 feet) away. 
§ 564. Unpacking.—The moving picture machines coming from 
the factory are very carefully packed. When removed from the 
box, it is advisable to take careful notes of just how the different 
parts are packed and to number the wooden cleats used to hold 
things in place, especially if the machine will need to be shipped 
away again. 
Be careful in unpacking all parts, especially the lenses. Do not 
throw away any wrapping material until sure that no parts are 
§ 565. The moving picture machine.—When unpacked the 
moving picture machine will be found to consist of a stand and base¬ 
board, arc lamp, lamp-house, condenser, aperture plate, objective, 
shutter, film magazines, and mechanism for moving the film. 
There will also be an extra film reel and a rewinder (fig. 221- 224). 
§ 566. The arc lamp.—The arc lamp usually supplied with 
moving picture outfits is of the hand-feed type with inclined car¬ 
bons. The handles for feeding the carbons and for slight up and 
down adjustments project backwards so they may be manipulated 
without opening the lamp-house. The good makes of arc lamp are 
adjustable so that the carbons can be held in the vertical or the


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