Frases de Heinrich Hertz (7 citações) | Citações e frases famosas

Heinrich Hertz: 7 citações 2 Curtidas

Heinrich Hertz Frases famosas

“Não se pode ignorar o sentimento que as fórmulas matemáticas têm uma existência independente e uma inteligência próprias e são mais sábias do que nós, mais sábias que os seus descobridores e aprendemos mais com elas do que inicialmente julgamos.”

Heinrich Hertz

“Não penso que as ondas de rádio que descobri vão ter alguma aplicação prática.”

Heinrich Hertz

“Os nossos desejos confusos encontram expressão na questão confusa assim como na força da natureza e eletricidade. Mas a resposta que queremos não é a resposta para esta questão. Não é por encontrar mais relações e conexões que se alcança a resposta, mas sim através da remoção das contradições existentes entre as já conhecidas e talvez reduzindo o seu número. Quando estas contradições dolorosas são removidas, a resposta à força da natureza não foi respondida. Mas as nossas mentes deixam de ter vergonha e param de fazer perguntas ilegítimas.”

Heinrich Hertz

Heinrich Hertz: Frases em inglês

“The rigour of science requires that we distinguish well the undraped figure of Nature itself from the gay-coloured vesture with which we clothe her at our pleasure.”

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Heinrich Hertz

As quoted by Ludwig Boltzmann in a letter to Nature (28 February 1895) http://books.google.com/books?id=PnUCAAAAIAAJ

“When a constant electric current flows along a cylindrical wire, its strength is the same at every part of the section of the wire. But if the current is variable, self-induction produces a deviation from this… induction opposes variations of the current in the centre of the wire more strongly than at the circumference, and consequently the current by preference flows along the outer portion of the wire. When the current changes its direction… this deviation increases rapidly with the rate of alternation; and when the current alternates many million times per second, almost the whole of the interior of the wire must, according to theory, appear free from current, and the flow must confine itself to the very skin of the wire. Now in such extreme cases… preference must be given to another conception of the matter which was first presented by Messrs. 0. Heaviside and J. H. Poynting, as the correct interpretation of Maxwell's equations as applied to this case. According to this view, the electric force which determines the current is not propagated in the wire itself, but under all circumstances penetrates from without into the wire, and spreads into the metal with comparative slowness and laws similar to those which govern changes of temperature in a conducting body.
…Inasmuch as I made use of electric waves in wires of exceedingly short period in my experiments on the propagation of electric force, it was natural to test by means of these the correctness of the conclusions deduced. As a matter of fact the theory was found to be confirmed by the experiments…”

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Heinrich Hertz

"On the Propagation of Electric Waves by Means of Wires" (1889) Wiedemann's Annalen. 37 p. 395, & pp.160-161 of Electric Waves
Electric Waves: Being Researches on the Propagation of Electric Action with Finite Velocity Through Space (1893)

“If we wish to lend more color to the theory, there is nothing to prevent us from supplementing all this and aiding our powers of imagination by concrete representations of the various conceptions as to the nature of electric polarisation, the electric current, etc.”

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Heinrich Hertz

Introduction, p. 28
Electric Waves: Being Researches on the Propagation of Electric Action with Finite Velocity Through Space (1893)
Contexto: It is not particularly satisfactory to see equations set forth as direct results of observation and experiment, where we used to get long mathematical deductions as apparent proofs of them. Nevertheless, I believe that we cannot, without deceiving ourselves, extract much more from known facts than is asserted in the papers referred to. If we wish to lend more color to the theory, there is nothing to prevent us from supplementing all this and aiding our powers of imagination by concrete representations of the various conceptions as to the nature of electric polarisation, the electric current, etc.