Home > Manual of Wireless Telegraphy for the Use of Naval Electricians: (English)
Manual of Wireless Telegraphy for the Use of Naval Electricians: (English)

Manual of Wireless Telegraphy for the Use of Naval Electricians: (English)

          
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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 Excerpt: ...period is equal to twice its length. An oscillator formed of a vertical wire free at one end and attached to the earth at the other, has high potential at the free end only if the earth connection is good. If it is not good, the tendency is to choke the current passing in and out of the earth, and thus to cause a rise of potential and consequent sparking at the earth connections. The natural period of such an oscillator, which should be approximately four times its length, is, on account of the choking effect of the poor ground shortened and made irregular, and the sending qualities of the station thereby impaired. It is found that the resistance of the earth between two similar rods, driven into it to the same depth, at the same distance apart, varies widelv in different localities, the resistance at some places being as much Ls 20 times greater than at others. It varies continually with the moisture and probably with other conditions near the surface. Low-ground resistance at i' station is usually accompanied by good radiating qualities. Ample surface on lead to the ground from the sending inductance and good electrical connect ion with the ground wires or plat es are essential on account of the large momentary currents created when sending. (See par. 88.) SENDING EFFICIENCY. 133. The efficiency of our means for electric wave making is difficult to determine. Estimating that 50 per cent of the energy in each condenser discharge is dissipated in light, sound, and heat in the closed and open circuits, we have in a condenser capacity of 0.02 mf. charged to a potential of 30,000 volts, the remaining 50 per cent of 6.64 foot-pounds = 3.32 foot-pounds of energv sent out in each wave train. This is equal approximately to 45,000,000 ergs per wave train, and it ha...


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Product Details
  • ISBN-13: 9781152401372
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 64
  • Series Title: English
  • Weight: 132 gr
  • ISBN-10: 1152401378
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 3 mm
  • Width: 189 mm


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