Which scottish-born inventor opened a school to train teachers of the deaf in boston and later built a device to transmit the human voice through a wire? a. gardiner hubbard b. henry ford c. alexander graham bell d. henry bessemer

The rise of advertising in the 1920s. i am good with seeing how advertisements shape the roaring twenties and how it developed a new way of life through modern days. but i am not sure what the details of advertising in the 1920s were. if possible can you send me links (preferrably credential links) to sources that maybe show like the first company to start advertising through the radio, how advertising benefits (statistics graphs), etc.