1. Telecommunication Pioneers Day 3

2. Benjamin Franklin b 1747 Leydn jar was the first capacitor b 1752 discovers that electricity has a positive and a negative charge b 1752 flew a kite to demonstrate electricity and lightening related

3. Luigi Galvani b 1737-1798, Italian b 1780 noticed frog’s leg jump b effects of electrostatic stimuli applied to the muscle fiber of frogs b “animal electricity” b Inspired Volta

4. Count Alessandro Giuseppe Antonio Anastasio Volta b (1745 - 1827) Italian b 1775 created the electrophorus b 1800 created the voltaic pile b Volt named after him

5. Hans Christian Ørsted b 1777 - 1851, Danish b 1820 a magnetic needle is deflected at right angles to a wire carrying an electric current b electromagnetic induction

6. André Ampère b (1775-1836), French b combined theory of magnetism and elec- tricity in early 1820's b electrical current creates magnetic fields b system to measure current flow called amperes

7. Georg Simon Ohm  1787-1854, German b describes relation- ship between current flow, voltage, and resistance b Ohm’s Law b Resistance measure

8. Joseph Henry  (1797-1878), American b discovered electro- magnetic induction b discovered self- inductance b Inductance measure is the Henry

9. Michael Faraday b (1791-1867), British b foremost experimental scientist of his day b discovery of electro- magnetic induction b the induction of one electric current by another

10. James Clerk Maxwell b (1831-1879), British b mathematical basis for electricity and electromagnetism b propagation of electromagnetic waves b light is made up of electromagnetic waves.

11. Heinrich Rudolph Hertz  (1857-94), German b demonstrates the pro- duction and detection of Maxwell's waves b photoelectric effect b Frequency in Hertz

12. Thomas Alva Edison b (1847 - 1931), American b 1887 creates the carbon microphone

13. Guglielmo Marconi b (1874-1937), Italian b Father of Wireless b 1894 Began work following Hertz b 1895 short range radio b 1899 Britain to France b 1901 Britain to Canada

14. Nathan B. Stubblefield b (1860-1928), US b 1892 invents “wireless telephone” b first person to transmit human voice without wires b demonstrates system officially May 30, 1902 in Philadelphia

15. Reginald A. Fessenden b (1866-1932), born in Canada of US parents b designs a high- frequency alternator for continuos signal b 1906 Christmas Eve First broadcast of speech & music

16. Lee De Forest b (1873-1961) US b 1906 Invents the “audion” now called a triode. Types of vacuum tube. b key component in nearly all radio, radar, TV, and computers until transistors