Farm Radio Briefs
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Publisher:
Published: 1945
Total Pages: 418
ISBN-13:
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Author: Historical Records Survey (U.S.)
Publisher:
Published: 1941
Total Pages: 626
ISBN-13:
DOWNLOAD EBOOKAuthor: Lewis Coe
Publisher: McFarland
Published: 1996-01-01
Total Pages: 212
ISBN-13: 9780786402595
DOWNLOAD EBOOKIn 1873 Scottish physicist James Clerk Maxwell first advanced the idea that there might be electromagnetic waves that were similar to light waves, a startling concept to the scientists of his day. About 13 years later, German physicist Heinrich Hertz demonstrated in his laboratory that electromagnetic radiation did indeed exist. But it was not until after Hertz's death that a young Italian named Guglielmo Marconi got the idea for a practical communications system based on Hertz's work. Marconi was surprised and disappointed that the Italian government was not interested in his newly discovered wireless communications system, and thus he took his equipment to England. From that point on, the wireless became identified with Britain. From these beginnings, wireless radio became the basis of a revolution that has resulted in the satellite communications of today. This history first looks at Marconi's invention and then explores its many applications, including marine radio, cellular telephones, police and military uses, television and radar. Radio collecting is also discussed, and brief biographies are provided for the major figures in the development and use of the wireless.
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Publisher:
Published: 1993
Total Pages: 1150
ISBN-13:
DOWNLOAD EBOOKV.1 Newspaper directory.--v.2 Magazine directory.--v.3 TV and radio directory.--v.4 Feature writer and photographer directory.--v.5 Internal publications directory.
Author: Food and Agriculture Organization of the United Nations
Publisher: Food & Agriculture Org.
Published: 2018-06-20
Total Pages: 87
ISBN-13: 9251097100
DOWNLOAD EBOOKThe first part of the Manual introduces the main steps of forest road network planning and gives guidance on road construction under different site conditions. It demonstrates good practices to minimize the area used for building purposes, to keep the environmental impact as low as possible and to maintain forest productivity. It describes the machinery suitable for the different construction phases and compares the advantages of machine types. The second part of the Manual introduces the goals and best practices of regular forest road maintenance which is a key operation that enables multi-purpose use of forests. It gives an overview on the main causes of forest road degradation and explains the different maintenance regimes and maintenance activities.
Author: Bernard Lyman Johnson
Publisher:
Published: 1923
Total Pages: 850
ISBN-13:
DOWNLOAD EBOOKAuthor: United States. Department of Agriculture. Library
Publisher:
Published: 1935
Total Pages: 570
ISBN-13:
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Publisher:
Published: 1927
Total Pages: 574
ISBN-13:
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