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Modern rail bar rolling
66
9Weehanics, Physics, and Chemistry.
~ a t l diaphragms, were "sharper" than those taken through large lenses without a diaphragm, but who ever pointed out the true cause, before Sir David Brewster did, two years ago, and the additional facts (independent of the stereoscopic angles, &c.,) contained in my article alluded to? The fact has always been explained to me, by artists, upon the principle of a profusion of light--somewhat similar to what takes place ~vhen 10oking at objects through a microscope in which the light is ad. mitted through a large aperture or diaphragm, but it will be seen from the articles alluded to, that this explanation is not correct. In conclusion, I would earnestly recommend all those interested, to give the article of Sir David Brewster a careful perusal, assuring them that they will be amply rewarded for their time. Philadelphia~ June 25th, 1855.
.Modern Rail Bar Rolling.* The Rhymney Iron Works Company has just rolled the largest railway bar ever produced. It is one of Barlow's patent rails, and has been sent to the Paris Exhibition. Previous to the appearance of this example of such rolling, a 22-feet rail was the ultimatum, but the Rhymney Company has gone, at one ~lride, to a length of 52 feet 6 inches. Mr. G. P. Hubbuck, the managing engineer of the works, conducted lhe operation, and he has made such excellent work in the present instance, that the rail has not been painted. It is simply brushed over with oil to repel the attacks of rust, and in this condition it will make its appearance in the great show of France. F o r t h e J o u r n a l of the F r a n k l i n I n s t i t u t e .
Sleamboal J~Jetropolis. Hull built by Samuel Sneden & Whitlock, Green Point, New York ; Engine by Stillman, Alien & Co.; Erastus W. Smith, Engineer. ItuL~.-L e n g t h on deck, . . " of keel, h a l f scarf, B r e a d t h of b e a m , " " moulded, " " over all, D e p t h o f hold, . L e n g t h of e n g i n e space, D r a f t of water, Tohuage, (Custom-house,) . 2108. C o n t e n t s of coal b u a k c r s , in t o n s , , 50. A v e r a g e speed t h r o u g h tile w a t e r per h o u r , 17.8 miles.
3 4 2 feet. 325 " 45 " 44 " 81 " t6 " 60 " 10 "
5 inehe,~. "
2
6
"
E~Glsm--One--vertical beam.-D i a m e t e r of cylinder, L e n g t h of stroke, . A v e r a g e pressure of s t e a m in p o u n d s , 24. +' c u t : o l t ' f r o m c o m m e n c e m e n t o f stroke, '++ revolutions per m i n u t e , •+ 15,~. •
105~ i u c h e a 12 feet. 4
" F r o m the L o n d o n M e c h a n i c s ' J o u r n a l , April, 18~5.
"
6
+'
9Weehanics, Physics, and Chemistry.
~ a t l diaphragms, were "sharper" than those taken through large lenses without a diaphragm, but who ever pointed out the true cause, before Sir David Brewster did, two years ago, and the additional facts (independent of the stereoscopic angles, &c.,) contained in my article alluded to? The fact has always been explained to me, by artists, upon the principle of a profusion of light--somewhat similar to what takes place ~vhen 10oking at objects through a microscope in which the light is ad. mitted through a large aperture or diaphragm, but it will be seen from the articles alluded to, that this explanation is not correct. In conclusion, I would earnestly recommend all those interested, to give the article of Sir David Brewster a careful perusal, assuring them that they will be amply rewarded for their time. Philadelphia~ June 25th, 1855.
.Modern Rail Bar Rolling.* The Rhymney Iron Works Company has just rolled the largest railway bar ever produced. It is one of Barlow's patent rails, and has been sent to the Paris Exhibition. Previous to the appearance of this example of such rolling, a 22-feet rail was the ultimatum, but the Rhymney Company has gone, at one ~lride, to a length of 52 feet 6 inches. Mr. G. P. Hubbuck, the managing engineer of the works, conducted lhe operation, and he has made such excellent work in the present instance, that the rail has not been painted. It is simply brushed over with oil to repel the attacks of rust, and in this condition it will make its appearance in the great show of France. F o r t h e J o u r n a l of the F r a n k l i n I n s t i t u t e .
Sleamboal J~Jetropolis. Hull built by Samuel Sneden & Whitlock, Green Point, New York ; Engine by Stillman, Alien & Co.; Erastus W. Smith, Engineer. ItuL~.-L e n g t h on deck, . . " of keel, h a l f scarf, B r e a d t h of b e a m , " " moulded, " " over all, D e p t h o f hold, . L e n g t h of e n g i n e space, D r a f t of water, Tohuage, (Custom-house,) . 2108. C o n t e n t s of coal b u a k c r s , in t o n s , , 50. A v e r a g e speed t h r o u g h tile w a t e r per h o u r , 17.8 miles.
3 4 2 feet. 325 " 45 " 44 " 81 " t6 " 60 " 10 "
5 inehe,~. "
2
6
"
E~Glsm--One--vertical beam.-D i a m e t e r of cylinder, L e n g t h of stroke, . A v e r a g e pressure of s t e a m in p o u n d s , 24. +' c u t : o l t ' f r o m c o m m e n c e m e n t o f stroke, '++ revolutions per m i n u t e , •+ 15,~. •
105~ i u c h e a 12 feet. 4
" F r o m the L o n d o n M e c h a n i c s ' J o u r n a l , April, 18~5.
"
6
+'