VISICORDER
ELECTRICAL INSTRUMENT EQUIPPED WITH AN OPTICAL SYSTEM FOR VISIBLY RECORDING VARIATIONS OF ELECTRIC CURRENT WHEREIN THE VARIATIONS IN THE CURRENT CAUSE INVISIBLE RADIATIONS TO IMPINGE UPON A MOVING SENSITIZED SHEET AND PRODUCE A VISIBLE TRACE ILLUSTRATING THE OSCILLATIONS OR VARIATIONS IN THE ELECTRIC CURRENT AS THEY OCCUR
Expired · February 15, 1949 · 71573880 ·
