Communications: An International History of the Formative by Russell Burns

By Russell Burns

This can be a huge booklet within which chronology frequently takes where of reflections on rules and improvement. a number of instances the writer jumps into the longer term to check what he's speaking approximately with what has happend many years later. Economics and know-how are combined up in a messy manner. it's a tricky interpreting. i used to be striken by way of the truth that the writer avoids to quote in chapters 1 and a pair of the first-class publication through Holzmann and Pehrson at the early optical platforms.

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Extra info for Communications: An International History of the Formative Years (History of Technology)

Example text

The first experiment with this system was in 1790, the distance between two stations being 437 yd (400 m). A disadvantage of the above scheme was that the transmission distance was limited by the initial intensity, and subsequent attenuation, of the sound from the gong. Chappe endeavoured to replace the sound signal by an electrical signal sent along a wire but the results were unsatisfactory because of the great difficulty, at that time, of insulating the conductor. Accordingly he turned his attention to a consideration of an optical system in which the precise moment of the transit of the pointer past the symbols was indicated by the appearance and disappearance of surfaces of different colours and forms.

References 1 Quoted in ‘Pioneers of electrical communication – Claude Chappe’, by R. D. T. : ‘On communication before the days of radio’, Proc. IRE, Section 17, Information Theory, 1962, pp. , London, 1967–1969), 6, p. : ‘Trajan’s column and the Dracian wars’ (Cornell University Press, 1971), pp. 80–82 11 Ibid, pp. : ‘Signalling methods amongst the ancients’, United Service Magazine, 1945, pp. J. Brill, Leiden, 1955), vol. II, pp. : ‘Engineers and engineering in the Renaissance’ (MIT Press, 1939), pp.

The cursus publicus was the state postal and messenger service of the Romans, Communication among the ancients 21 and originated sometime during the 3rd century BC. It was created wholly for the transmission of governmental and administrative correspondence and enabled the emperors of Rome to govern their far-flung empire from the capital by correspondence alone: it was not a general facility which could be employed by the public. Such a facility was not introduced until about the 15th century, although commercial companies and wealthy men had their own staff of tabellari [46].

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