The Radio Amateur's Hand Book

The Radio Amateur's Hand Book
Author :
Publisher : anboco
Total Pages : 314
Release :
ISBN-10 : 9783736407923
ISBN-13 : 3736407920
Rating : 4/5 (920 Downloads)

Book Synopsis The Radio Amateur's Hand Book by : A. Frederick Collins

Download or read book The Radio Amateur's Hand Book written by A. Frederick Collins and published by anboco. This book was released on 2016-08-13 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: Before delving into the mysteries of receiving and sending messages without wires, a word as to the history of the art and its present day applications may be of service. While popular interest in the subject has gone forward by leaps and bounds within the last two or three years, it has been a matter of scientific experiment for more than a quarter of a century. The wireless telegraph was invented by William Marconi, at Bologna, Italy, in 1896, and in his first experiments he sent dot and dash signals to a distance of 200 or 300 feet. The wireless telephone was invented by the author of this book at Narberth, Penn., in 1899, and in his first experiments the human voice was transmitted to a distance of three blocks. The first vital experiments that led up to the invention of the wireless telegraph were made by Heinrich Hertz, of Germany, in 1888 when he showed that the spark of an induction coil set up electric oscillations in an open circuit, and that the energy of these waves was, in turn, sent out in the form of electric waves. He also showed how they could be received at a distance by means of a ring detector, which he called a resonator.


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