1. Reginald Aubrey Fessenden

2. On 23 December 1900 Fessenden made the first human voice transmission by wireless. One, two, three, four. Is it snowing where you are Mr. Thiessen? If it is, telegraph back and let me know. The historic event occurred at Cob Point Maryland. Shown are the twin towers at the Cob Point facility.

3. Fessendens 125 m transmission tower at Brant Rock, Mass where he made his historic Christmas broadcast on 24 December 1906 to ships at sea. He played " Oh Holy Night, " on his violin. Then he played a recording of Handels Largo, and delivered a Christmas speech.

4. Inside the Brant Rock Lab.

5. The components of a turn-of-the century spark gap alternator a) Diagramatic cross section b) Armature winding c) One half of the completed armature d) The complete system

6. *Edward (Ted) Samuel Rogers The famous 15S, the world ' s first alternating current simple rectifier tube. This development enabled radio power supply from a 110 V household supply, eliminating the need for an antenna in the process.

7. Ted Rogers was only 24 when he developed the 15S in 1924. The following year he developed the first all electric radio.

8. Rogers ' batteryless radios were put on the market in Canada in September, 1925. The ad is from November 1925. Batteryless radios were offered in the USA in May, 1926, and the following year in Europe.