The Wireless Age Volume 4

The Wireless Age Volume 4

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 edition. Excerpt: ...detectors, which are of different types, as explained later. The detector serves the purpose of rectifying the current from an oscillatory current to a pulsating direct current. The properties of the crystal detector, such as galena, silicon, ferron, carborundum, etc., will retard positive or plus current in one direction and allow negative or minus current to pass from the opposite direction during the same alternation. The rectified current then enters the high resistance telephones and the impulses representing dots and dashes actuate the diaphragms by the energizing of the small magnets. Another type of detector is the vacuum valve which emits electrons from a lighted filament and relays a local battery current which has large amplifying properties. This local current energizes the head 'phone magnets and thereby causes the diaphragms to vibrate accordingly. The Evinrude engine, which is mounted on a pack frame, is not designed consistently to work with the generator, considerable energy being lost in the driving mechanism due to slipping belts, small diameter pulleys and idlers which should all be eliminated. The engine should be designed, together with the generator, as one unit. This plan will eliminate a considerable quantity of castings and metal, lightening the load and lessening the vibration, due to the fact that the load is top heavy and has inadequate foundation and possible loosening of parts. The driving medium from the engine to the generator can best be accomplished by housed gears running in oil, similar to the driving mechanism from an automobile engine to the pump and magneto shaft. The engine can be air-cooled to eliminate the trouble with the water cooling system previously referred to, the fan or blower being...
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Product details

  • Paperback | 482 pages
  • 189 x 246 x 25mm | 853g
  • United States
  • English
  • black & white illustrations
  • 1236942485
  • 9781236942487