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20 feet abutment amount angle arch bars beams Bletchingly bottom braces bridge caisson cars cast iron cement cent centre to centre column compression compression members connected cost cubic curvature curves dead load depth diagonal diameter distance embankment employed engine excavation factor of safety feet long feet per mile feet per month feet span flange foot freight gauge girder grade horizontal hot blast increase joint length less load lower chord masonry material mortar narrow gauge panels passenger Pennsylvania Railroad piers piles placed plate pounds per inch pounds per square pounds rail proportion radius rail Railroad railway resistance rivets road rock rods sand shaft shearing shearing strength shown in Fig side slope square inch steel stone surface tensile strength tension timber top chord track traffic truss tunnel upper chord vertical Victoria Bridge weight wheels width wood wrought iron yards
Page vii - The THEORY of STRAINS in GIRDERS and similar Structures, with Observations on the application of Theory to Practice, and Tables of the Strength and other Properties of Materials.
Page 514 - I found the bed of the river, for at least three feet in depth, a moving mass, and so unstable that, in endeavoring to find footing on it beneath the bell, my feet penetrated through it until I could feel, although standing erect, the sand rushing past my hands, driven by a current apparently as rapid as that at the surface.
Page 473 - The welding of steel bars, owing to their being so easily burned by slightly overheating, is a difficult and uncertain operation.
Page 473 - In screwed bolts the breaking strain is found to be greater when old dies are used in their formation than when the dies are new, owing to the iron becoming harder by the greater pressure required in forming the screw thread when the dies are old and blunt, than when new and sharp.
Page 533 - It soon became apparent, however, that this new means of transport was attended with qualities which must exclude every indiscriminate exercise of the carrying business. A railway, like a vast machine, the wheels of which are all connected with each other, and whose movement requires a certain harmony, cannot be worked by a number of independent agents. Such a system would speedily be attended with self.destruction. The...
Page 419 - Such information, to be obtained through a system of daily reports and checks that will not embarrass principal officers, nor lessen their influence with their subordinates.
Page 468 - ... their cinder envelopes. But the cohesion between the iron and its cinder once destroyed, and its strength is gone. Now whether cohesion is the result of magnetic attraction (according to Faraday) or otherwise, this process appears to be purely mechanical. But let the explanation, which is here offered, be correct or not, the fact remains that fibrous iron and all kinds of iron and steel, will be rendered brittle by vibration and tension, or by bending and twisting, without undergoing any mysterious...
Page 563 - Manual for Railroad Engineers and Engineering Students, containing the Rules and Tables needed for the Location, Construction and Equipment of Railroads, as built in the United States.
Page 466 - ... anvil, then strike a few heavy blows upon the nip, so that each blow will cause the bar to rebound and to vibrate intensely, and the result will be a granular and somewhat crystalline fracture. Now take up the two halves, and nip them again all, around, about one or two inches off the fractured ends, break them off 'by easy blows over the round edge of the anvil, and the fibre will appear again. This experiment proves that a break, caused by sudden jars and intense vibration, may show a granular...