Charles Stuart Ballantine Born: 22 September 1897 Born on
September 22, 1897, at Germantown, Philadelphia, Pennsylvania,
Mr. Ballantine's interest in radio developed from a boyhood
hobby to a life work. He was educated at Drexel Institute, and
in the Graduate School of Harvard University, specializing in
mathematical physics. During the first World War he served as an
expert radio aide in the Philadelphia Navy Yard, where he had
charge of the development of the Navy coil-type compass, a
forerunner of radar. He discovered the "antenna effect" in coil-
type systems and invented the capacity compensator for its
control. In 1923 he was awarded the John Tyndall Fellowship in
physics at Harvard University. At this time he developed the
principle of negative feedback to stabilize and reduce
distortion in transmission circuits, modulators, amplifiers, and
detectors. Mr. Ballantine engaged in extensive studies of
detection at high signal levels, fluctuation noise in radio
receivers and tubes, development of technique f