The Welfare of Animals Part ppsx
An Encyclopedia of the History of Technology part 11 ppsx
... the end of the eighteenth century. PART ONE: MATERIALS 84 lead, and then in 1687 to the refining of copper. John Carter, a protégé of Clarke, subsequently went into partnership with a group of ... as the centre of copper and brass production in 1763. In the autumn of that year, Charles Roe of the Macclesfield Copper Company first sensed the possibilities of th...
Ngày tải lên: 04/07/2014, 01:20
An Encyclopedia of the History of Technology part 14 ppsx
... lighter than the electrolyte, floats to the surface of the bath where it must be collected without shorting the electrodes. Furthermore, the gas liberated at the anode is chlorine rather than the oxygen ... 708°C, the melting point of the chloride. This accumulated as a liquid in the base of the reactor, and was transferred, still in the molten state, to the el...
Ngày tải lên: 04/07/2014, 01:20
An Encyclopedia of the History of Technology part 24 ppsx
... other by the now celebrated equation E=mc 2 , where E is the energy, m the mass and c the velocity of light. After the work of Frederick Soddy and Ernest Rutherford during the first decade of ... orbits, a number of electrons equal to the number of protons. The latter is the atomic number and determines the chemical identity of the element. The number of...
Ngày tải lên: 04/07/2014, 01:20
An Encyclopedia of the History of Technology part 36 ppsx
... course of the working cycle of the engine. Second, the nomenclature is applicable to the steam engine, because the combustion in the furnace of the steam engine is external to the engine. Third, the ... version of the latter engine, the W2B, became the basis of the American version of the Whittle engine, the IA, which was built by the General Electr...
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An Encyclopedia of the History of Technology part 51 ppsx
... At the top of the slope the wedge of water makes a level with the surface in the upper pound and the gate which holds back the upper pound falls under the pressure of the wedge. To propel the ... passing the locks, so in the 1960s two new lengths of canal were built, one at the level of the canal below the lowest lock and the other at the level abov...
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An Encyclopedia of the History of Technology part 52 ppsx
... exploited in the valley. The nobility of Kleve, part of the domains of the Elector of Brandendurg, persuaded the Elector to allow the canalization of the Ruhr in order to supplement the shortage of supplies ... locks to the level of the Elbe-Havel Canal. Yet another east-west link was completed in the north in 1935 with the construction of the Küste...
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An Encyclopedia of the History of Technology part 54 ppsx
... who closed the western canal in 1863 and most of the remainder by the end of the century. Most of the other canals between the Ohio and the eastern seaboard had also succumbed to the thrust of the railways. All ... one valley to another the highest part of the canal is called the summit level. Into this generally run the feeders which supply the princip...
Ngày tải lên: 04/07/2014, 01:20