American Engineer and Railroad Journal, Volum 9Simmons-Boardman Publishing Corporation, 1839 |
Altres edicions - Mostra-ho tot
Frases i termes més freqüents
advantages amount applied average axle boat boiler bridge calculation carriage cars cast iron cent centimes centre Champlain Canals Chenango canal coal coefficient completed consequently construction cost crank cylinder density distance dollars driving wheels edge rail effect equal Erie canal estimated evaporation excavation expenses experiments explosion feet per mile formula freight friction fuel furnaces grades heat horse power improvement inches increase iron Lehigh canal length less Little Miami Railroad Little Miami river Liverpool load locomotive locomotive engines machine masonry means Messrs miles per hour motion nearly number of passengers operation pass Philadelphia piston plates portion Pottsville present pressure produce quantity rail Railroad Journal railway Reading railroad repairs resistance result river road route side steam steam-engines steamboats sufficient superstructure surface temperature tion toll tons train transportation trip tunnel Utica velocity vessel volume weight wheels whole
Passatges populars
Pàgina 142 - Arts, constituted by the Franklin Institute of the State of Pennsylvania for the promotion of the Mechanic Arts...
Pàgina 6 - On all lines there is a yearly increase of at least 15 to 20 per cent. in the gross income, so that even those lines which do not pay now will give in a few years a handsome dividend. According to these statements, based on the communications collected in this country, I have no doubt that the large capital invested in railroads...
Pàgina 320 - But it is only within the last few years that it has been possible to realise something of the beauty and significance of this
Pàgina 329 - ... flat-bottomed basin, cropping out on one side of the hill. The trial shafts had accidentally been sunk on each side of this basin, so that it had entirely escaped notice until the sinking of the working shaft. Mr. Stephenson was led to suppose that the water might be pumped out, and that under the water thus drained the tunnel might be formed with comparative facility; this proved to be the case. Engines for pumping were erected, and shafts sunk a little distance out of the line of the tunnel....
Pàgina 60 - In condensing engines which work expansively, called low pressure, when working with ordinary speed, the pressure of steam should usually range between one and one and a half atmospheres above the boiling point. But on emergencies, the pressure may be increased to two atmospheres. The boilers should have a range of strength falling but little short of those used for high pressure. They may be constructed of the common wagon-top form, provided that they are properly braced in their flat sides and...
Pàgina 202 - ... of iodine, which forms the first coating, which is very thin, as it does not exceed the millionth part of a metre in thickness. There are certain indispensable precautions necessary to render this coating uniform, the chief of which is the using of a rim of metal round the sheet. The sheet thus prepared, is placed in the camera obscura, where it is allowed to remain from eight to ten minutes.
Pàgina 124 - Pennsylvania, have invented a new and improved mode of preventing steam-boilers from bursting, and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.
Pàgina 31 - ... bolts, embracing the hub in a distinct piece between them. The difference between such wheels, and those constructed by us, is so obvious as not to need pointing out. ; What we claim as our invention, and wish to secure by letters patent, is the manner of constructing wheels for railroad cars, or for other purposes to which they may be applied, with double convex plates, one convex outwards, and the other inwards, and an undivided hub ; the whole cast in one piece, as herein fully set forth.
Pàgina 347 - The wheels suggested are made on the following principles : -1st. They are wholly of wrought iron, so welded together, that, independent of screws, rivets, or any other kind of fastening, they form one piece with the spokes. 2nd. The spokes of the wheels are placed diagonally, and act as trusses, thereby giving the greatest possible support to the rim, or tire, and, at the same time, being in the best position for resisting lateral pressure. 3rd. Iron in a state of tension or compression, as is usually...
Pàgina 290 - It is far from my wish to promulgate to the world that the ridiculous expectations, or rather professions of the enthusiastic...