By Russell Burns
It is a huge ebook within which chronology usually takes where of reflections on principles and improvement. numerous instances the writer jumps into the long run to check what he's speaking approximately with what has happend a long time later. Economics and know-how are combined up in a messy manner. it's a tricky studying. i used to be striken via the truth that the writer avoids to quote in chapters 1 and a pair of the excellent booklet via Holzmann and Pehrson at the early optical platforms.
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Additional resources for Communications: An International History of the Formative Years (History of Technology)
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. For his purpose Chappe used a pivoted wooden plate, painted black on one side and white on the other, placed at a height of 13 ft (4 m), on a supporting structure. On 2nd March 1791, before a group of a local oﬃcials, he sent messages from Paris to Brulon, a distance of more than 9 miles (15 km).
Famianus Strada , an Italian author and Jesuit priest, in 1617 also used the same principle in his Prolusiones Academicae. If you wish your distant friend, to whom no letter can come, to learn something, take a disc or dial and write round the edge of it the letters of the alphabet in the order in which children learn them, and, in the centre, place horizontally a rod, which has touched a magnet, so that it may move and indicate whatever letter you wish. Then a similar dial being in the possession of your friend, if you desire privately to speak to the friend whom some share of the earth holds far from you, lay your hand on the globe, and turn the movable iron as you see disposed along the margin of all the letters which are required for the words.
Forbes (Ref 13), p. 10, pp. : ‘Britain’s old-time ﬁery beacons’, Army Quarterly, 1943, pp. 62–66 HARDY, T. : ‘Rymer’s Foedera’, II, p. : ‘The Elizabethan Militia’ (Routledge and Kegan Paul, London, 1967) Ibid, pp. : ‘When the Sussex beacons blazed’, The Sussex County Magazine, 1943, pp. : ‘The legacy of Rome’ (Oxford University Press, 1924), pp. : ‘The speed of the Roman Imperial Post’, J. Roman Studies, 1925, 15, pp. : ‘The Armada and the Post Oﬃce’, Chambers Journal, 1939, pp. : ‘The Messageries of the University of Paris’, British Journal of Education Studies, 1955, 4, No.
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