President Coolidge with a loud-speaker equipped
President Coolidge with a loud-speaker equipped car to be used in his 1924 presidential campaign. Loud speakers were new technology, enabled by amplifying triode vacuum tubes invented in 1918. - (BSLOC_2014_17_8)
Picture No
11061850
Media ID
45264741
Size
3000px x 2723px
(1.8MB)
Credit
Mary Evans / The Everett Collection
Source
Everett Collection
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Address Amplification Amplifying Calvin Campaigning Candidates Coolidge Electronics Enabled Equipped Governors Invented Lcgr1412req Loud Speaker Speakers Tubes Vacuum
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