April 10th 05, 08:23 AM
|
|
|
On Sat, 9 Apr 2005 23:39:15 -0500, (Richard
Harrison) wrote:
National Bureau of
Standards Circular 74 has long been the most authorative source of such
information. Some of the most useful contained therein are reproduced
here."
Hi Richard,
Some background material:
"George Southworth was born in Little Cooley, Pennsylvania, in
1890 and became interested in radio while still in high school. He
graduated with a degree in physics from Grove City College in 1914
and then studied for a year at Columbia University. In June 1917
he joined the Radio Section of the U.S. National Bureau of
Standards and assisted in the preparation of the influential
Bulletin 74 entitled Radio Instruments and Measurements, published
in1918.
... [some time later]
"In 1931 he began a study of wave propagation in dielectric rods,
although the project did not yet have official authorization. By
early 1932, he observed wave propagation in a water-filled copper
pipe. Theoretical analysis related to Southworth's experiments was
carried out by John R. Carson, Sergei A. Schelkunoff, and Sallie
P. Mead during 1932.
"Using high-frequency vacuum tubes imported from France,
Southworth transmitted waves through air-filled copper pipes up to
20 feet long by May 1933. He later recalled that the first message
sent through a waveguide was 'Send money.'"
73's
Richard Clark, KB7QHC
|