HEINRICH RUDOLF HERTZ HEINRICH RUDOLF HERTZ (1857 (1857 -- 1894)1894)

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William William CrookesCrookes(1832(1832--19191919 ))

SOME POSSIBILITIES OF ELECTRICITYFortnightly Review, 1, 1892: pages 174-176.

Propuso las ondas EM para la telegrafía. Dio los tres requisitos fundamentales: transmisores fiables, receptores sintonizables sensibles y antenas direccionales

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The Americans have need of the telephone, but we do not. We have plenty of messenger boys.

Sir William Preece, chief engineer of the British Post Office, 1876

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EdouardEdouard BranlyBranly(1846 (1846 -- 1940)1940)

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Augustus Righi is pictured here carrying out anexperiment with electrical charges in the hall ofthe Physics Institute at the University of Bolognawhere he was a professor and an expert on Hertzian waves. Righi, who was a friend of thefamily first made Marconi aware of Hertzianwaves (1900) .

Sir Oliver Joseph Sir Oliver Joseph LodgeLodge

(1851 (1851 -- 1940)1940)

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AleksandrAleksandr StepanovichStepanovich PopovPopov(1859 (1859 -- 1905)1905)

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NikolaNikola Tesla Tesla (1856(1856--1943)1943)

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Sir Sir JohnJohn AmbroseAmbrose FlemingFleming(1849 (1849 –– 1945)1945)

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Lee De Lee De ForestForest((1873 1873 –– 1961)1961)

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Michael Michael IdvorskyIdvorskyPupinPupin

(1858 (1858 -- 1935 )1935 )

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ProfessorProfessorAdolphAdolph SlabySlaby

((1849 1849 -- 19131913 ))

El circuito de chispa no en la antena de transmisión (como Marconi) sino en otro circuito acoplado inductivamente con el de la antena.