An Encyclopedia of the History of Technology part 29 pptx

... cross- compound 298 Curtis 293 –4 high pressure 298 , 300 high speed 299 high temperature 300–301 hybrid 297 impulse 290 , 294 steam turbines—cont marine engines 530– 31, 535 Parsons (reaction) 290 –91 power generation ... 282 poppet 282 slide 282, 344–5, 404 thermionic 41, 727, see also diode; triode Wankel rotating disc 328 Van Harinxma Canal 492 Van Starkenborgh Canal 492 Vanguard...

Ngày tải lên: 04/07/2014, 01:20

... Devices and Mechanisms 1 Ian McNeil The place of technology in history 1 Science and technology 2 The archaeological ages 4 The seven technological ages of man 5 The first age: man, the hunter, ... fire 5 The second age: the farmer, the smith and the wheel 11 The third age: the first machine age 22 The fourth age: intimations of automation 27 The fifth ag...

Ngày tải lên: 04/07/2014, 01:20

... how they fought their wars and which side won, was largely dependent on the state of their technology and that of their enemy. Their motivation was more often than not economic, and economic history ... history and the history of technology can surely be considered as twin hand-maidens, the one almost totally dependent on the other. So far as social history is concer...

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... practice, and this is the first step in the process of moving forward to a new solution. Thus the history of technology and the history of invention are very much the same. Why study the history of technology? ... who studied, rather than the rise and fall of civilizations, the rise and fall of technologies the technologies of hunting and weapon-making,...

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... numbers of slaves, there was a demand for such mechanization as was available and the successors of the Romans continued to build water mills. At the time of the Domesday survey there was an estimated ... of his mount to the weapon in his hand, be it sword, axe or lance. Some idea of the state of manufactures in the sixth and seventh centuries is given by artefacts...

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... for measuring the bores of cannon and the diameter of cannon balls. The crank An important development in the Middle Ages was that of mechanisms for the interconversion of rotary and reciprocating ... weight. All the gears were of brass. Galileo’s observations of the swinging altar lamp in the cathedral of Pisa marked the start of the use of the pendu...

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... in the materials used in buildings. They caused the decline of many towns and villages which were not served by the railway lines. They speeded up the mails and greatly accelerated the spread of ... spread of news by the rapid distribution of the daily papers. They popularized seaside and other holiday resorts and improved communications by their use of the telegraph...

Ngày tải lên: 04/07/2014, 01:20

... after the arrival of the Spanish invaders by the North American Indian: Giovanni Verazzano, who visited the Atlantic Coast in 1524, commented upon the vast quantities of copper owned by the Indians, ... ridiculous and to many others a threat to the dignity of themselves as members of the human race or worse, a threat to the very existence of humanity as the only...

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... Tepe Giyan, in the Persian highlands, during the 4th millennium, and subsequently moved southwards to Sumeria and the Persian Gulf, and westwards to the Mediterranean seaboard, during the third ... the fourth millennium BC and were found in the 1930s at the site of Tepe Giyan, near Nahavand in Western Iran. This mountainous region, situated midway between the Persian Gulf...

Ngày tải lên: 04/07/2014, 01:20

... found its way into many of the later Roman bronzes, which by the middle of the second century AD tended to contain comparable quantities of zinc and tin. The characteristics of these alloys, which ... truly Roman in origin, the improved standards of living associated with the rapid dissemination of the Roman way of life stimulated metallurgical demand, and encourag...

Ngày tải lên: 04/07/2014, 01:20