Libbie Hawes of Brownstoner Philadelphia featured Thomas Mansion
in her column "Building of the Day"
4/21/2011 12:04:14 pm
So beautiful posts,all I like,hope to be better then,and enjoy yourself,good luck in your life. 4/22/2011 06:13:49 pm
At first, two iron wires connected each pair of telephones. Then switchboards brought phone wires into one location. Other inventions - the vacuum tube to amplify sound, and coaxial cables to link long distances on land and under the seas -- greatly expanded phone service. Transistors replaced the old vacuum tubes, and by the 1960s communications satellites eliminated the necessity of landlines. Today, bundles of glass fibers carry calls on laser beams of light. 9/25/2011 11:22:24 am
hen switchboards brought phone wires into one location. Other inventions - the vacuum tube to amplify sound, and coaxial cables to link long distances on land and under the seas -- greatly expanded phone service. Transistors Leave a Reply. | ArchivesNovember 2010 Categories |
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