The History of Insects potx
The History of Insects potx
... repays him by manuring his lands. They abound in warm countries, particularly in the southern parts of France and ***START OF THE PROJECT GUTENBERG EBOOK THE HISTORY OF INSECTS* ** E-text prepared by ... are more numerous. About the middle or latter part of summer, we hear them among the leaves of the trees: their notes, which are continued about the space of one...
Ngày tải lên: 28/06/2014, 19:20
The History of England from the Accession of James II, Vol. 3 potx
... he thought lightly of the authority of Scripture. He was therefore required to profess his faith in the divinity of the Son and of the Holy Ghost, and in the inspiration of the Old and New Testaments. Such ... question of humanity and of expediency. They spoke much of the debt of gratitude which the nation owed to the priesthood; of the courage and fide...
Ngày tải lên: 08/03/2014, 22:20
The Social History of Smoking potx
... proportion of the members of the House of Commons were smokers. Macaulay has drawn for us the not very attractive picture of the smoking-room of the old House of Commons before the fire of 1834 ... antiquary, The Social History of Smoking 31 of the vertues thereof: of which the relation woulde require a volume by itselfe: the use of it by so manie...
Ngày tải lên: 15/03/2014, 19:20
The History of Cuba, vol. 4 potx
... governments in the island, all of the judges of the Supreme Court, a majority of the judges of first instance, and half of the Provincial Governors, urged its retention unchanged. The clergy of the Roman ... trial of exile as well as of the respite in the island, the menace of a race war, with which our Spanish beneficiaries would like to inspire a fear...
Ngày tải lên: 24/03/2014, 03:21
An Encyclopedia of the History of Technology part 1 potx
... ages 4 The seven technological ages of man 5 The first age: man, the hunter, masters fire 5 The second age: the farmer, the smith and the wheel 11 The third age: the first machine age 22 The fourth ... machine age 22 The fourth age: intimations of automation 27 The fifth age: the expansion of steam 31 The sixth age: the freedom of internal combustion 37...
Ngày tải lên: 04/07/2014, 01:20
An Encyclopedia of the History of Technology part 25 potx
... countries that border the eastern Mediterranean, in the centuries before the birth of Christ. The harnessing of these natural forms of power grew out of the difficulties of grinding grain by hand ... number of larger towns. The use of slaves or servants to grind the grain for the family became too expensive, and there was a real need to increase the production...
Ngày tải lên: 04/07/2014, 01:20
An Encyclopedia of the History of Technology part 37 potx
... Transactions of the American Society of Mechanical Engineers, vol. 66, (1944), pp. 351–71 Whittle, F. The early history of the Whittle jet propulsion gas turbine’, Proceedings of the Institution of Mechanical ... characteristic of the Carnot cycle. A particular feature of the Stirling engine is the use of two cylinders and two pistons. One of these, the disp...
Ngày tải lên: 04/07/2014, 01:20
An Encyclopedia of the History of Technology part 38 potx
... was that the magnetic field of the extra coils compensated for the distortion of the magnetic field caused by the current in the armature. In the simple generator, without compounding, the brush ... it turned it magnetized the soft iron, first in one direction then in the other, and at each change of the direction of magnetization a current was induced in the c...
Ngày tải lên: 04/07/2014, 01:20
An Encyclopedia of the History of Technology part 43 potx
... courage the opportunities of a good life farming in the West competed with the prospect of factory work in the East. This created the high level of wages offered and the need to build skill into the machine ... at the rate of two million a year in the USA before the market collapsed when the era of the automobile arrived. The need for many small parts in th...
Ngày tải lên: 04/07/2014, 01:20
An Encyclopedia of the History of Technology part 65 potx
... few other manufacturers followed suit because of the problem of adequately inspecting the welds. More significant was the development of the metal cantilever wing by the Junkers company. The founder, ... fin at the rear of the aircraft like the flights of an arrow to stabilize the aircraft; then converted this into a rudder act ing simultaneously with the wing...
Ngày tải lên: 04/07/2014, 01:20