. Practical wireless telegraphy; a complete text book for students of radio communication . aston the deck. Each wire is accurately meas-ured between two points marked off on thedeck and the wire cut and attached to theinsulators. Six or eight inches must be al-lowed for serving the wire through the eyeof the antenna insulator. All connections are thoroughly made onthe deck, after which the halyards are passedthrough the reef block and fastened to theshackle on the bridle. The aerial is then pulledinto space, it being freed from all obstructionsby three or more assistants. 120. Earth Connectio
. Practical wireless telegraphy; a complete text book for students of radio communication . aston the deck. Each wire is accurately meas-ured between two points marked off on thedeck and the wire cut and attached to theinsulators. Six or eight inches must be al-lowed for serving the wire through the eyeof the antenna insulator. All connections are thoroughly made onthe deck, after which the halyards are passedthrough the reef block and fastened to theshackle on the bridle. The aerial is then pulledinto space, it being freed from all obstructionsby three or more assistants. 120. Earth Connection.—The con-nection from the transmitting apparatusto the earth plate should be direct as pos-sible and the conductor should be one ofhigh conductivity. In marine installa-tions the earth wire is simply fastened tothe metal bulkhead by a bolt, the earthconnection being thus made through thehull. Usually this connection is not morethan two or three feet in length. On wooden vessels connection is madeto the propeller shaft in the engine room ^g. i46_Eiectrose Moulded insulator. BRASS ROD. RUBBER AERIALS OR ANTENNAE. 125 or to the water drip at the smoke funnels. Installations grounded or earthed inthis manner generally do not transmit as far as those on vessels with steel a wooden vessel is placed in drydock and 200 or 300 feet of copper oryellow metal nailed on the bottom for an earth capacity. A strip of copper is thenled from it to the radio cabin. The earth plate for the land station is sometimes very elaborate and may consist of agreat number of copper or zinc plates buried in moist earth to a depth of several feet. Inaddition a number of wires are spread radially from the station in all directions, being laidparticularly directly underneath the flat top portion of the aerial. If the station is locatedon rock or dry soil, the earth wires are merely laid on the surface of the ground under-neath the aerial. All wires are then joined to a common term
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
