The Story of Wireless TelegraphyD. Appleton, 1904 - 207 страници |
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Страница 31
... and others . These researches on the part of Wilkins were followed in the earlier half of the next decade by two series of highly interesting experiments con- ducted respectively by George E. Dering and James Bowman Lindsay.
... and others . These researches on the part of Wilkins were followed in the earlier half of the next decade by two series of highly interesting experiments con- ducted respectively by George E. Dering and James Bowman Lindsay.
Страница 47
... interesting to note that it is in connection with this scheme of Mahlon Loomis that we first hear of the application of vertical conductors , or antennæ , as they are sometimes called , for the transmission of signals to a great ...
... interesting to note that it is in connection with this scheme of Mahlon Loomis that we first hear of the application of vertical conductors , or antennæ , as they are sometimes called , for the transmission of signals to a great ...
Страница 55
... interesting a nature as to be worth quoting somewhat in extenso . " In a vessel of water , " he writes , " I placed a sheet of paper . At two points on that paper were fastened two ordinary sewing - needles , which were also connected ...
... interesting a nature as to be worth quoting somewhat in extenso . " In a vessel of water , " he writes , " I placed a sheet of paper . At two points on that paper were fastened two ordinary sewing - needles , which were also connected ...
Страница 62
... interesting results , " says Dolbear , were obtained when the static receiver with one terminal was employed . A person standing upon the ground at a distance from the discharging point could hear nothing ; but very little stand- ing ...
... interesting results , " says Dolbear , were obtained when the static receiver with one terminal was employed . A person standing upon the ground at a distance from the discharging point could hear nothing ; but very little stand- ing ...
Страница 76
... interesting of Sir William Preece's experiments of this description took place in 1886 on the banks of the Severn , between Gloucester and Bristol , where for some fourteen miles , with an average distance apart of four and a half miles ...
... interesting of Sir William Preece's experiments of this description took place in 1886 on the banks of the Severn , between Gloucester and Bristol , where for some fourteen miles , with an average distance apart of four and a half miles ...
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aerial telegraphy arrangement battery boat cable Canada capacity Carlo Alberta coherer communication condenser conducted conductor connected copper wire detector diameter discharge discovery distance Dolbear earth earth-plates effect elec electromagnetic waves England exciter experiments feet fessor Flat Holm galvanometer graphy Hertz Hertzian waves induction coil instrument interrupter invention inventor investigations kilometers King of Italy Lavernock Point length Leyden jar lighthouse magnetic Mahlon Loomis Marconi mast means ments mercury meters method microphone miles Morse key obtained Orling-Armstrong oscillations parallel patent Poldhu poles possible Preece Preece's primary circuit Professor Braun receiving apparatus relay resistance sending station sensitive sent ship shore shown in Fig signals Sir Oliver Lodge Sir William spark-gap sparks Story successful surface syntony tance telephone terminal tion trans transmission tricity Trowbridge tube vertical conductor vertical wire vessels Willoughby Smith Wimereux wireless message wireless tele wireless telegraphy yards
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Страница 191 - Other Worlds than Ours ; The Plurality of Worlds Studied under the Light of Recent Scientific Researches.
Страница 102 - Here, then, is revealed the bewildering possibility of telegraphy without wires, posts, cables, or any of our present costly appliances. Granted a few reasonable postulates, the whole thing comes well within the realms of possible fulfilment.
Страница 196 - SHORT HISTORY OF NATURAL SCIENCE ; and of the Progress of Discovery from the Time of the Greeks to the Present Time.
Страница 103 - ... which will easily pass through buildings and fogs, to those long waves whose lengths are measured by tens, hundreds, and thousands of miles; secondly, more delicate receivers which will respond to wavelengths between certain defined limits and be silent to all others; thirdly, means of darting the sheaf of rays in any desired direction, whether by lenses or reflectors, by the help of which the sensitiveness of the receiver (apparently the most difficult of the problems to be solved) would not...
Страница 194 - Such an honest and thorough treatment of the subject in all its bearings that it will carry weight and be accepted as an authority in tracing the process by which the scientific method has come to be supreme in modern thought and life.
Страница 102 - Here is unfolded to us a new and astonishing world — one which it is hard to conceive should contain no possibilities of transmitting and receiving intelligence. Rays of light will not pierce through a wall, nor, as we know only too well, through a London fog. But the electrical vibrations of a yard or more in wave-length of which I have spoken will easily pierce such mediums, which to them will be transparent.
Страница 99 - ... handy they will run along it, and may be felt a long way off. If no wire exists they will spread out like sound from a bell, or light from a spark, and their intensity will decrease according to the inverse square of the distance. Maxwell and his followers well knew that there would be such waves ; they knew the rate at which they would go, they knew that they would go slower in glass and water than in air, they knew that they would curl round sharp edges, that they would be partly absorbed but...
Страница 111 - I was so discouraged at being unable to convince them of the truth of these aerial electric waves that I actually refused to write a paper on the subject until I was better prepared to demonstrate the existence of these waves ; and I continued my experiments for some years, in hopes of arriving at a perfect scientific demonstration of the existence of aerial electric waves produced by a spark from the extra currents in coils, or from frictional electricity, or from secondary coils.
Страница 192 - FGS The Story of the Mind. By Prof. J. MARK BALDWIN. The Story of Photography. By ALFRED T. STORY.
Страница 194 - ... constitutes in many ways the most instructive review that has ever been written of the evolution of human knowledge in its conflict with dogmatic belief. . . . As a contribution to the literature of liberal thought, the book is one the importance of which can not be easily overrated." — Boston Beacon. " The most valuable contribution that has yet been made to the history of the conflicts between the theologists and the scientists.