The Story of Wireless TelegraphyD. Appleton, 1904 - 207 страници |
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Страница 11
... Metal is a conductor of heat , as may be proved by putting one end of a metal rod in the fire and taking hold of the other end . Elec- tricity finds its way through certain substances in the same manner , and in proportion to the ease ...
... Metal is a conductor of heat , as may be proved by putting one end of a metal rod in the fire and taking hold of the other end . Elec- tricity finds its way through certain substances in the same manner , and in proportion to the ease ...
Страница 36
... metal plates or balls placed in the water z , at a certain distance apart , according to the width of the water to be traversed ; B , B represent the bat- tery and instrument on the opposite side of the water ; C , E , D , F are ...
... metal plates or balls placed in the water z , at a certain distance apart , according to the width of the water to be traversed ; B , B represent the bat- tery and instrument on the opposite side of the water ; C , E , D , F are ...
Страница 43
... metal plate sunk in the river and connected with a delicate galvanometer . Some prelimi- nary experiments between the Hotel de Ville and the works of M. Claparède at St. Denis having proved successful , it was decided to put the plan in ...
... metal plate sunk in the river and connected with a delicate galvanometer . Some prelimi- nary experiments between the Hotel de Ville and the works of M. Claparède at St. Denis having proved successful , it was decided to put the plan in ...
Страница 68
... metal roof of the car . When the Morse sounder in the primary circuit of the induction apparatus is depressed , and by this means the instrument is put in action , the secondary wires connected with the metallic condensing surface ...
... metal roof of the car . When the Morse sounder in the primary circuit of the induction apparatus is depressed , and by this means the instrument is put in action , the secondary wires connected with the metallic condensing surface ...
Страница 70
... metal brush , which through the resulting friction gives forth a sound of a certain height . By the passage of the electrical current over the brush through the chalk cylinder the strength of the position is altered , and a sound of a ...
... metal brush , which through the resulting friction gives forth a sound of a certain height . By the passage of the electrical current over the brush through the chalk cylinder the strength of the position is altered , and a sound of a ...
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Често срещани думи и фрази
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.