Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 117
r determined that for open arc, no MOTION PICTURE ELECTRICITY carbon arc lamps having an automatic feed on constantpotential direct current circuits, the arc should not belonger than required to give a potential drop of 40 to 45volts. It was further determined that for best results thepositive… … NEGATIVE CRATER ARC MISTPOSITIVE CRATERARC 59 for the negative electrode it was found that a pencil ofsolid carbon, smaller in diameter than the upper carbon,on account of the unequal consumption of the two elec-trodes, would best serve the purpose. We will take for granted that the rules…
Motion picture theaters · Electric lighting
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
