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/lit39438/545/
Ch. XIII] 
THE ELECTRIC ARC 
537 
Fig. 292. The Vertical Carbon Arc with 20 Amperes of Direct 
Current. 
a Vertical carbons with the positive carbon above and the negative carlxm 
below. This shows that the large crater is on the positive carbon and the small 
Crater on the negative carbon. Between the two craters extends the arc stream 
of hot gases. 
This photograph was made with an exposure of 1/100 second, the aperture 
b>eing F/22. A color screen was used to cut out most of the violet, so that the 
^.rc stream would not obscure the craters. A subsequent exposure of 90 seconds 
■Was made without a color screen and with an aperture of F/8. The illumina¬ 
tion during this exposure was by means cf a 40 watt, mazda lamp. 
b Vertical carbons with a 20 ampere direct current. No color screen. 
Expo sure 1/100 sec.; opening F/22. 
This shows the size of the two craters; it also shows the conical arc stream 
almost as light as the craters. This is because the violet light which has 
relatively little effect in illumination has a great effect on the photographic 
plate. 
This picture shows how the carbons, the craters and the arc stream appear 
in an instantaneous view to the photographic plate, while the one at the left 
(a) gives much more nearly the appearance to the human eye with an instan¬ 
taneous view.
        

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