The Technical World Magazine, Volume 15Technical World Company, 1911 |
From inside the book
Page 33
method , by which it is practicable to send extra conversations by the wire . At the bottom of the idea upon which the invention is based lies the fact that the electro - magnetic rays which pass over a telephone wire are audible only ...
method , by which it is practicable to send extra conversations by the wire . At the bottom of the idea upon which the invention is based lies the fact that the electro - magnetic rays which pass over a telephone wire are audible only ...
Page 34
... wire itself . The ordi- nary battery telephonic current is largely a conduction current through metal , and the ohmic resistance of the wire is one of the principal obstacles to long - distance telephoning . On the other hand , in wire ...
... wire itself . The ordi- nary battery telephonic current is largely a conduction current through metal , and the ohmic resistance of the wire is one of the principal obstacles to long - distance telephoning . On the other hand , in wire ...
Page 35
... wire- less telegraphy , and those of them which are relatively low down in the scale of frequency can be employed to carry mes- sages . All the vibrations being bunched to- gether and guided by the wire in a single direction , they can ...
... wire- less telegraphy , and those of them which are relatively low down in the scale of frequency can be employed to carry mes- sages . All the vibrations being bunched to- gether and guided by the wire in a single direction , they can ...
Page 57
... wires by alternating current taken aboard the locomotive at 11,000 volts . For the twelve miles on the New York Central tracks they are operated from the third rail by direct current at 650 volts . When the New Haven de- cided to ...
... wires by alternating current taken aboard the locomotive at 11,000 volts . For the twelve miles on the New York Central tracks they are operated from the third rail by direct current at 650 volts . When the New Haven de- cided to ...
Page 59
... wires . The third rail system is now being ex- tensively used for direct current . There are no overhead wires and ... wire . Just now the eyes of the railroad world are upon the daring innovation which has been put into use by the New ...
... wires . The third rail system is now being ex- tensively used for direct current . There are no overhead wires and ... wire . Just now the eyes of the railroad world are upon the daring innovation which has been put into use by the New ...
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