Bauhaus-Universität Weimar

Titel:
Optic Projection: Principles, Installation and Use of the Magic Lantern, Projection Microscope, Reflecting Lantern, Moving Picture Machine
Person:
Gage, Henry Simon and Henry Phelps Gage
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit39438/543/
Ch. XIII] 
THE ELECTRIC ARC 
S3 S 
of this number, or 15 amperes from the line. The watts in the two 
cases are theoretically exactly the same. 
The watts for the primary are 2 20 x 15 = 3300. 
The watts for the secondary are 55 x 60 = 3300. 
(1) Volts secondary _ Turns secondary 
Volts primary Turns primary 
(2) Amperes primary _ Tunis secondary 
Amperes secondary Turns primary 
Primary 
Secondary 
Fk;. 291. Diagram of a Transformer. 
Two coils of a wire, Primary and Secondary, are wound on an iron ring. An 
alternating current in the primary sets up an alternating magnetic flux in the 
iron ring, which in turn sets up an alternating electric potential in the secondary 
coil. 
The Electric Arc 
§ 740. The construction of an electric arc is very simple. Two 
electrodes are taken which may be made of any conducting material. 
One electrode is connected directly to one of the wires of a direct 
current supply of over 40 volts, the other electrode is connected 
through a rheostat to the other wire (fig. 280). When the two 
electrodes are brought in contact an electric current will flow 
between them. If now, the electrodes are slightly separated, the 
current will not be immediately interrupted, but will flow through 
the air gap between the electrodes.
        

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