Query: *
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
Level:
item
Creators:
Underwood & Underwood
Size:
1 Item (4" x 5")
Collection ID:
NMAH.AC.0143
Repository:
Archives Center, National Museum of American History
Digital Content Available