Los Angeles Times / UCLA Library · CC BY 4.0
Hedy Lamarr’s name belongs to two histories that are too often kept apart: the history of Hollywood and the history of invention. Born in Vienna on 9 November 1914, she became an internationally recognised screen performer. Away from the camera, she also helped devise a method intended to make radio-controlled weapons harder to disrupt.
Her film career included Ziegfeld Girl and Samson and Delilah. Public attention focused strongly on her appearance, yet the record of her technical work reveals interests that cannot be contained within a studio image. In collaboration with composer George Antheil, she explored a practical wartime problem: how could a radio signal guide a torpedo if an opponent tried to jam it?
A signal transmitted continuously at one frequency offered an adversary a target. Lamarr and Antheil proposed moving the transmission between different frequencies, with the transmitter and receiver changing together. Someone without the changing pattern would find the communication more difficult to disrupt or follow.
The challenge of staying in step
Synchronisation was crucial. Random changes at only one end would break the connection rather than protect it. Their proposal therefore needed a means of keeping the two devices in step, drawing on the kind of coordinated mechanisms associated with player pianos. Antheil’s musical knowledge and Lamarr’s inventive interests met in an unexpected setting.
They applied for a patent in June 1941. United States patent 2,292,387 was issued on 11 August 1942 under the title Secret Communication System. Lamarr appeared under her legal name at the time, Hedy Kiesler Markey, alongside Antheil. The documentary record matters because it identifies her as a co-inventor, rather than merely a celebrity associated with someone else’s work.
The proposal did not become an operational wartime torpedo system. Nor is it accurate to reduce the subsequent history of wireless technology to the claim that Lamarr single-handedly invented Wi-Fi. Frequency-hopping techniques belong to a wider technical history, and later systems depended on many additional developments.
Recognition came much later. The Electronic Frontier Foundation honoured Lamarr and Antheil’s contribution in 1997, and the National Inventors Hall of Fame inducted them in 2014.
Her birthday offers a useful corrective to the assumption that a public profession defines the limits of a person’s abilities. Lamarr’s contribution can be appreciated without turning it into a myth: an actor and a composer identified a communications problem, designed a solution and left a patent that makes their collaboration visible.
