The Commercial Value of Wireless Telegraphic Communication With the Andaman Ni
The Commercial Value of Wireless Telegraphic Communication With the Andaman Ni
Richard Carnac Temple
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I have caused to be circulated to those present a printed copy of some practical formulae and rules of thumb, drawn up by myself, for arriving with sufficiently approximate accuracy at the height of the pole necessary for communicating to any required distance, and vice versa for finding out how far one can communicate with any pole or mast one happens to possess. They are as follows : Formula Z. To find height of pole for any given distance at sea : \/distance in sea miles X 12 = height of pol...e in feet. on land : ^distance in miles X 20 = height of pole in feet. ( 6 ) Rule of Thumb I. at sea : multiply the approximate square root of the distance in sea miles by 12 to find height of pole in feet. on land : multiply the approximate square root of the distance in miles by 20 to find height of pole in feet. Illustration. For 65 miles at sea : 8 x 12 = 96 feet as height of pole, 30 miles on land : 5| X 20 = 110 feet as height of pole. N. B, The constant effort of those conducting the research into Wireless Telegraphy is to reduce the multipliers 12 and 20, Formula IX.
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