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(II UPTEB X "Suprex" Type High Intensity Arc
ANOTHER type of light source has taken its . place with the A.C. high intensity arc in bridging the gap between the low-intensity and the larger high-intensity arcs. This is the Suprex arc. This new type of arc operates on direct current, and employs B series of high-intensity carbons smaller in diameter and operating at lower arc currents than have hitherto been used for high intensity projection. The carbons have been designed so that, with a few simple precautions, the positive carbon does not need to be rotated and the negative carbon can be coaxial with the positive. The carbons are protected from oxidation, and their electrical resistance is reduced by a copper coating that makes it practicable to hold the carbons any convenient distance from the arc. These carbons burn with the same crater formation, and give the same brilliant snow-white light on the screen as the larger, uncoated, high-intensity D.C. carbons.
The consumption and current-carrying capacity of the carbons for the new Suprex type lamps are given in Table XI.
TABLE XI National "Suprex" Carbon Combinations
Consumption —
Inches per Hour
Effective
Current Range
Voltage Range
Pos. Crater
( 'arbons
Diam. —
Positive
Negative
Inches
6 mm x 12" Suprex
Cored Positive
32-40
31-40
6.5-13.5
3.0-4.5
0.14-0.16
5 mm x 9" Suprex
Solid Negative
7 mm x 12" Suprex
Cored Positive
42-50
31-40
6.5-13.5
3.0-4.5
0.15-0.20
6 mm x 9 "Suprex
Cored Negative
8 mm x 12" Suprex
Cored Positive
56-65
31-40
6.5-13.5
3.0-4.5
0.20-0.25
8.6 or 7 mm x 9"
Suprex Cored Neg
ative
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