The History and Progress of the Electric Telegraph: With Descriptions of Some of the ApparatusD. Van Nostrand, 1869 - 280 páginas |
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Página 46
... armature to the cores of an electro - magnet , whose coils were in connection with the line , released a wound - up mechanism . This alarm arrangement is given in Fig . 20. The tooth- wheel n was arrested by the end of the lever p . On ...
... armature to the cores of an electro - magnet , whose coils were in connection with the line , released a wound - up mechanism . This alarm arrangement is given in Fig . 20. The tooth- wheel n was arrested by the end of the lever p . On ...
Página 47
... armature ; whereas , when he employed a magnetic needle , the latter was always easily deflected . This suggested to him a way to overcome the difficulty , which he succeeded in doing by closing the circuit of a local battery , by the ...
... armature ; whereas , when he employed a magnetic needle , the latter was always easily deflected . This suggested to him a way to overcome the difficulty , which he succeeded in doing by closing the circuit of a local battery , by the ...
Página 48
... armature is held on one end of a lever , on whose other end a pencil or style is carried , which either marks a zigzag line or presses into a strip of paper pulled with a uniform velocity over it . 42. Morse's telegraph underwent in a ...
... armature is held on one end of a lever , on whose other end a pencil or style is carried , which either marks a zigzag line or presses into a strip of paper pulled with a uniform velocity over it . 42. Morse's telegraph underwent in a ...
Página 51
... armature , and regulated the motion of an escapement similar to that of a clock . It consisted of two parts : - 1. The transmitter , and 2. The receiving instrument . The transmitting portion of the original apparatus con- sisted of a ...
... armature , and regulated the motion of an escapement similar to that of a clock . It consisted of two parts : - 1. The transmitter , and 2. The receiving instrument . The transmitting portion of the original apparatus con- sisted of a ...
Página 52
... armature was held down on one side , and the index prevented from moving further round the dial . 45. An improvement in the apparatus was made by dis- pensing with one of the line wires , as well as one of the contact springs , of the ...
... armature was held down on one side , and the index prevented from moving further round the dial . 45. An improvement in the apparatus was made by dis- pensing with one of the line wires , as well as one of the contact springs , of the ...
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Términos y frases comunes
alphabet alternate currents armature arrangement atmospheric electricity attracted axis back contact beam bottom cable carried clockwork coils commutator connected consists construction contact-pins copper core corresponding current passes currents arriving cylinder deflected dial direction disc drum electricity electro-magnet employés galvanic galvanometer galvanoscope gutta percha hemp holes horizontal inductor inserted insulated intermediate station interrupted iron wires knot length letter lever Leyden jar lifted line battery line wire line-wire local battery means Messrs metal method mètre Morse apparatus motion needle negative current opposite paper strip permanent magnet plate pointer poles positive current posts pressed printing printing-press ratchet-wheel ratus receiving station relay resistance roller rotating round scape-wheel screw sending station shaft shown in Fig side Siemens signals soft-iron spiral spring style surface switch synchronism teeth terminal tion tongue tooth transmitting tube turning type-wheel underneath upper vertical vulcanite wheel whilst wire zinc
Pasajes populares
Página 5 - he felt himself struck in his arms, shoulders, and breast, so that he lost his breath, and was two days before he recovered from the effects of the blow and the terror.
Página 11 - ... and his wife, by remarking the corresponding motions of the ball, writes down the words they indicate: from which it appears he has formed an alphabet of motions. As the length of the wire makes no difference in the effect, a correspondence might be carried on at any distance...