 When it is considered that stone bridges do not exceed 200 feet in span, nor cast-iron bridges 250 feet, we can estimate the progress which has been made in crossing rivers 400 or 500 feet in width, without any support at the middle of the stream. Even...  Report of the Annual Meeting - Página lxiiipor British Association for the Advancement of Science. Meeting - 1862Vista completa - Acerca de este libro
 | 1861 - 738 páginas
...considered beyond the reach of human skill. When it is considered that stone bridges do not exceed 1 50 feet in span, nor cast-iron bridges 250 feet, we can...bridged over with safety, provided we do not exceed 1,800 to 2,000 feet, when the structure would be destroyed by its own weight. It is to the exactitude... | |
 | 1861 - 460 páginas
...bridges do not exceed one hundred and fifty feet in span, nor cast-iron bridges two hundred and fifty feet, we can estimate the progress which has been made in crossing rivers four hundred or five hundred feet in width, without any support at the middle of the stream. Even spans,... | |
 | 1861 - 362 páginas
...is considered that stone bridges do not exceed 160 feet in span, nor cast-iron bridges 2.50 fe«t, we can estimate the progress which has been made in...exceed 1800 to 2000 feet, when the structure would be aesttoyed by its own weight. It is to the exactitude and accuracy of our machine tool* that our machinery... | |
 | William Newton - 1861 - 428 páginas
...human skill. AVheu it is considered that stone bridges do not exceed 150 feet in span, nor cast iron bridges 250 feet, we can estimate the progress which...structure would be destroyed by its own weight. : It is to the exactitude and accuracy of our machine tools1, that our machinery of the present time owes... | |
 | British Association for the Advancement of Science - 1861 - 144 páginas
...considered beyond the reach of human skill. When it is considered that stone bridges do not exceed 1":0 feet in span, nor cast-iron bridges 250 feet, we can...the progress which has been made in crossing rivers 4oO or 500 feet in width, without any support at the middle of the stream. Even spans, greatly in excess... | |
 | 1862 - 338 páginas
...considered beyond the reach, of human skill. When it is considered that stone bridges do not exceed 150 feet in span, nor cast-iron bridges 250 feet, we can...the structure would be destroyed by its own weight. To his collaborateur in these experiments, who has passed from us within the past year, Mr. Fairbairn... | |
 | British Association for the Advancement of Science - 1862 - 804 páginas
...cast-iron bridges 250 feet, we can estimate the progress which has been made in crossing rivers 4OO or 5OO feet in width, without any support at the middle of...structure would be destroyed by its own weight. It is to the exactitude and accuracy of our machine tools that oar machinery of the present time owes... | |
 | 1862 - 446 páginas
...bridges do not exceed one hundred and fifty feet in span, nor cast-iron bridges two hundred and fifty feet, we can estimate the progress which has been made in crossing rivers four or five hundred feet in width, without any support at the middle of the stream. Even spans greatly... | |
 | 1862 - 448 páginas
...bridges do not exceed one hundred and fifty feet in span, nor cast-iron bridges two hundred and fifty feet, we can estimate the progress which has been made in crossing rivers four or five hundred feet in width, without any support at the middle of the stream. Even spans greatly... | |
 | 1862 - 476 páginas
...bridges do not exceed one hundred and fifty feet in span, nor cast-iron bridges two hundred and fifty feet, we can estimate the progress which has been made in crossing rivers four or five hundred feet in width, without any support at the middle of the stream. Even spans greatly... | |
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