Monitor, Receiver switch, United States Veterans Hospital. Designed and constructed by Radio Construction Corp., Washington, D.C.

Radio set labeled "Type A-M-S-5 medium wave reciever" built for the U.S. military

Safety device for blind landing of air-track. Washington D.C. The monitoring device of the air-track blind landing in the above photo tells the man on the ground if all the beams are being sent out correctly if there is any error in transmission of the beams this machine will pick It up immediately

Police radio station in Washington, D.C., 10/38

Colored radio recorder is latest in radio receivers. E.B. Judson of the Bureau of Standards and his two colored radio recorder, automatically recording signals in two colors, red and black. This automatic receiver is capable of receiving signals from American or European stations

New wireless teletypewriter. Washington, D.C., Oct. 15. A new radio teletypewriter service permitting instantaneous transmission of written records without the aid of wires, has been perfected by the experts of the Bureau of Air Commerce, Department of Commerce. Commerce officials said a chain of te

Naval Observatory tran. clock, switchboard & chronograph time rec. *Abstract/medium:; 5 x 7 in. or smaller

The largest and smallest radio sets on exhibition at the Radio Show in Wash.

By merely plugging the head telephone in the wall above the bed, each bedridden soldier in Walter Reed Hospital is provided with radio entertainment. A Central radio system in the basement of this hospital feeds 900 head telephones scattered throughout the building