Assertion: furnace's efficiency | /r/HasProperty | increased
Facets:
value: by operating at higher arc currents
type: CAUSE
Source sentences:
text: Experience with other metals indicates that casting efficiencies can be increased by operating at higher arc currents, but no such heats have been attempted with hafnium even though the furnace is now equipped to operate at arc currents up to 8,000 amperes.