Wireless Telegraphy: Its History, Theory and PracticeMcGraw publishing Company, 1905 - 299 páginas |
Outras edições - Ver todos
Wireless Telegraphy: Its History, Theory and Practice Archie Frederick Collins Visualização completa - 1905 |
Wireless Telegraphy: Its History, Theory and Practice Archie Frederick Collins Visualização completa - 1905 |
Wireless Telegraphy: Its History, Theory and Practice (Classic Reprint) A. Frederick Collins Prévia não disponível - 2018 |
Termos e frases comuns
action adjusted aerial wire air-gap alternating current amperes antenna apparatus armature arranged battery Branly Braun break capacity charge closed circuit coefficients coherer condenser conductor plugs connected in series consists core curve detector diameter dielectric direct current disk disruptive discharge distance earth effect elec electric oscillations electric resonance electric waves electro-magnetic electrolytic employed energy ether ether waves Fessenden filings frequency galvanometer glass Hertz high-potential inches increased induction coil inductor insulated internal circuit interruptor Leyden jar Lodge magnetic Marconi mercury metal method Morse register non-syntonized number of turns obtained ohms open-circuit open-circuit oscillator operated opposite oscillator balls oscillator system plate polarized potential primary circuit primary coil produced radiator receptor relay resistance resonator system secondary coil shown in Fig siphon recorder SLABY-ARCO spark spark-gap syntonized tapper telephone receiver terminals theory tion trans transformer transmitter tube tuned turns of wire vertical wire vibrations wave length wireless telegraphy
Passagens mais conhecidas
Página 47 - The discharge, whatever may be its nature, is not correctly represented (employing for simplicity the theory of Franklin) by the single transfer of an imponderable fluid from one side of the jar to the other; the phenomena require us to admit the existence of a principal discharge in one direction, and then several reflex actions backward and forward, each more feeble than the preceding, until the equilibrium is obtained.
Página 8 - Passing onward to the gaseous state, still more of the evident characters of bodies are annihilated. The immense differences in their weight almost disappear ; the remains of difference in color that were left, are lost.
Página 65 - I can account for these phenomena only by supposing the long wire to become charged with electricity, which by its re-action on itself projects a spark when the connection is broken.
Página 8 - ... accompanying changes of form, and which is perhaps sufficient to induce, in the inventive and sanguine philosopher, a considerable degree of belief in the association of the radiant form with the others in the set of changes I have mentioned. " As we ascend from the solid to the fluid and gaseous states, physical properties diminish in number and variety, each state losing some of those which belonged to the preceding state.
Página 68 - It will be shown in a later section that the power dissipated in a resistor is equal to the product of the resistance and the square of the current.
Página 8 - The immense differences in their weights almost disappear ; the remains of difference in colour that were left, are lost. Transparency becomes universal, and they are all elastic. They now form but one set of substances, and the varieties of density, hardness, opacity, colour, elasticity and form, which render the number of solids and fluids almost infinite, are now supplied by a few slight variations in weight, and some unimportant shades of colour.
Página 48 - It is easy to explain this law, if we assume that the discharge of a battery is not a simple motion of the electricity in one direction, but a backward and forward motion between the coatings, in oscillations which become continually smaller until the entire vis viva is destroyed by the sum of the resistances.
Página 7 - If we conceive a change as far beyond vaporization as that is above fluidity, and then take into account also the proportional increased extent of alteration as the changes rise, we shall perhaps, if we can form any conception at all, not fall far short of Radiant Matter; and as in the last conversion many qualities were lost, so here also many more would disappear.
Página 47 - ... very fine needles were employed, an increase in the force of the electricity produced changes of polarity. About a thousand needles were magnetized in the testing helices in these researches. This puzzling phenomenon was finally cleared up by the important discovery that an electrical equilibrium was not instantaneously effected by the spark, but that it was attained only after several oscillations of the flow. "The...
Página 64 - Maxwell is the professed exponent. We must allude here once more to Maxwell's electromagnetic theory of light, the touchstone of which is the proposition that in transparent media, whose magnetic inductive capacity is very nearly equal to that of air, the dielectric capacity is equal to the square of the index of refraction for light of infinite wave length. Although, as perhaps was to be expected, owing to disturbing influences such as heterogeneity, this proposition has not been found in good agreement...