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Carbon trims
[Film Technology]
The gaseous arc are itself is drawn between two
cerium-cored white-flame carbon rods or trims.
These continually burn away, the motor driven feed rotating the positive pole
to sustain a symmetrical crater. Burning life is limited to about 90 minuets.
Carbon trims burn at colour temperatures from
around 6000-3350 K, depending on their core material; corrective
colour filters being used to adjust or match their light as required.
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