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Electricity and Modern Physics Photonegatives
Small storage battery room, Belmar, RCA Engineering Department
Motor-generator room and place battery rack, Riverhead, New York
Radio reception table, Belmar, New York. RCA Engineering Department
Duplex relay shelf, Belmar, New York. RCA Engineering Department
Line terminal cabinet, Riverhead, New York
Receiving engineer's desk, Riverhead, New York
Traffic room, Belmar, New York, RCA Engineering Department
Receiving sets on shelves, Belmar, New York, RCA Engineering Department
Landline distribution, Belmar, New York, RCA Engineering Department
Photographs of apparatus used in Professor R. A. Aessenden's system of wireless technology
Standard capacity, primary and secondary
Wireless telegraph, landline table, Belmar Engineering Department, RCA
Wireless telegraph, landline switchboard, Belmar Engineering Department, RCA