US PATENT SUBCLASS 373 / 105
.~.~.~ By changing arc length

Current as of: June, 1999
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373 /   HD   INDUSTRIAL ELECTRIC HEATING FURNACES

60  DF  ARC FURNACE DEVICE {9}
102  DF  .~ Power supply system {4}
104  DF  .~.~ With power regulation {1}
105.~.~.~ By changing arc length {1}
106  DF  .~.~.~.~> Using a hydraulic or pneumatic device

DEFINITION

Classification: 373/105

By changing arc length:

(under subclass 104) Subject matter wherein the arc power is regulated by changing the positions of the arc electrodes relative to the charge or each other.