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Updated: May 25, 2025
Herbert E. Metcalf, 3,000 feet in the air, and which startled the City of Washington on April 2, 1919, by repeating President Wilson's Victory Loan Message from an airplane in flight so that it was distinctly heard by 20,000 people below. This wonderful achievement was accomplished through the installation of the Magnavox and amplifiers in front of the Treasury Building. Every word Lt.
By removing the cap from the receiver the shell is screwed into a receptacle on the end of the loud speaker and the instrument is ready for use. A Super Loud Speaker. This loud speaker, which is known as the Magnavox Telemegafone, was the instrument used by Lt.
By removing the cap from the receiver the shell is screwed into a receptacle on the end of the loud speaker and the instrument is ready for use. A Super Loud Speaker. This loud speaker, which is known as the Magnavox Telemegafone, was the instrument used by Lt.
Herbert E. Metcalf, 3,000 feet in the air, and which startled the City of Washington on April 2, 1919, by repeating President Wilson's Victory Loan Message from an airplane in flight so that it was distinctly heard by 20,000 people below. This wonderful achievement was accomplished through the installation of the Magnavox and amplifiers in front of the Treasury Building. Every word Lt.
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