Brief History

1. Telegraph invented by Gauss and Weber in 1834, perfected by Morse in 1844, Marconi and Popov worked on wireless, and in 1901 trans Atlantic wireless from Cornwall to Newfoundland.
2. 1860 Telephone developed by Reiss, 1876 Bell Telephone founded, 1878 first telephone exchange in New Haven, CT, 1915 transcontinental telephone TJ Watson to AG Bell, 1953 transatlantic telephone cable, 1960s mobile radio (cellular).
3. 1900s AM invented and popularized by De Forest; commercial radio station begins broadcasting in Pittsburgh 1920.
4. 1933 FM and angle modulation proposed by Armstrong (much opposition by De Forest), but success by 1949.
5. 1929 Zworykin develops TV camera (iconoscope); 1939 BBC broadcasts TV, color TV in US in 1954.