National Museum of American History
P.O. Box 37012
Suite 1100, MRC 601
Constitution Ave., between 12th and 14th Sts., N.W.,
Washington, D.C. 20013-7012
1 item, 4" x 5" ; Silver gelatin on glass.
Item contained within the Underwood & Underwood Steregraph Collection. The Mystery Radio!--Dr. Riggs granted 40 patents on revolutionary set based on entirely new principles. New York: Left, Donald F. Hastings, assistant to Dr. Riggs, discussing the amplifier with the inventor. This amplifier is but 5 inches wide by 3 inches high, yet it will fill the largest autidorium with music, it is asserted. Two of the revolutionary tubes are shown on top of the amplifier. The box contains a complete outfit for operting a set from house current. The set can operate on either A.C. or D.C. with identical quality and volume. 1796 photonegative.