loading/hleð
(24) Blaðsíða 14 (24) Blaðsíða 14
( 14 ) charged of one current before a second current is sent, and there lies the great primary difficulty. With submarine wires this is a comparatively slow process. Why does not the wire embedded in the gutta-percha discharge itself as rapidly as the wire on the poles ? For this simple reason, that if a powerful current be sent into a 2000-mile cable, the. greater portion becomes taken up by charging the inner surface of the gutta-percha. The copper-wire discharges itself instantaneously to earth at the other end, but the gutta-percha discharges itself of the charge it has taken up very slowly, and the consequence is, that when the copper-wire should and would be free, the induced charge taken up by the gutta-percha is flowing back from it and recharging the wire. The transmission, after the working current, of a stream of an opposite polarity neutralises to a certain extent what remains of the former current, but only does it partially; the result is, that the final remainder of the former current flows out from the cable in opposite directions, so that when a second current is sent it meets with the resistance of the return current, and thus is con- siderably retarded; and to such an extent is this retardation in a 2000-mile cable experienced, that if ten consecutive currents of the same polarity were sent into the Atlantic cable, only one elong- ated signal would be recorded at the other end, one current overtaking the other like waves on a beach ; and so long a period is this retention of charge in 2000 miles of insulated wire, that it was quite possible to get a discharge from the Atlantic cable twenty-four hours after a current had been transmitted through it; the whole, in fact, being nothing more or less than one im- mense Leyden jar. Or, in other words, the copper easy, the gutta-percha difficult of polarization. The more easy of polarization a substance is, the better a conductor it becomes; the more difficult of polarization, the better insulator: in fact, perfection in insulation means a perfect resistance to polarization, and the more difficult a matter is of polarization, with so much more difficulty does it give
(1) Band
(2) Band
(3) Saurblað
(4) Saurblað
(5) Kápa
(6) Kápa
(7) Mynd
(8) Mynd
(9) Blaðsíða [1]
(10) Blaðsíða [2]
(11) Blaðsíða 1
(12) Blaðsíða 2
(13) Blaðsíða 3
(14) Blaðsíða 4
(15) Blaðsíða 5
(16) Blaðsíða 6
(17) Blaðsíða 7
(18) Blaðsíða 8
(19) Blaðsíða 9
(20) Blaðsíða 10
(21) Blaðsíða 11
(22) Blaðsíða 12
(23) Blaðsíða 13
(24) Blaðsíða 14
(25) Blaðsíða 15
(26) Blaðsíða 16
(27) Blaðsíða 17
(28) Blaðsíða 18
(29) Blaðsíða 19
(30) Blaðsíða 20
(31) Blaðsíða 21
(32) Blaðsíða 22
(33) Blaðsíða 23
(34) Blaðsíða 24
(35) Blaðsíða 25
(36) Blaðsíða 26
(37) Blaðsíða 27
(38) Blaðsíða 28
(39) Blaðsíða 29
(40) Blaðsíða 30
(41) Blaðsíða 31
(42) Blaðsíða 32
(43) Blaðsíða 33
(44) Blaðsíða 34
(45) Blaðsíða 35
(46) Blaðsíða 36
(47) Kápa
(48) Kápa
(49) Saurblað
(50) Saurblað
(51) Band
(52) Band
(53) Kjölur
(54) Framsnið
(55) Kvarði
(56) Litaspjald


The Atlantic ocean telegraph

Ár
1860
Tungumál
Enska
Blaðsíður
52


Beinir tenglar

Ef þú vilt tengja á þessa bók, vinsamlegast notaðu þessa tengla:

Tengja á þessa bók: The Atlantic ocean telegraph
https://baekur.is/bok/e8b630d4-c39e-478c-9efa-473d6db80d6e

Tengja á þessa síðu: (24) Blaðsíða 14
https://baekur.is/bok/e8b630d4-c39e-478c-9efa-473d6db80d6e/0/24

Vinsamlegast ekki tengja beint á myndir eða PDF skjöl á Bækur.is þar sem slíkar slóðir geta breyst án fyrirvara. Notið slóðirnar hér fyrir ofan til að tengja á vefinn.