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Updated: June 20, 2025
The question of economy of material presented itself as a comparison between a few standard types, viz., the girder bridge of small independent spans; the cantilever bridge, or the continuous girder bridge in three large spans; the single girder bridge with one large span and several small spans; and the arch with small girder spans on each side.
Not only did the gigantic structure on the far side of the gap seem continually on the verge of toppling forward into the abyss, but the end of the south cantilever likewise quivered and swayed, and the mad flow of the roaring, ice-covered waters beneath added to the giddiness of height the terrifying illusion that the immense steel skeleton had torn loose from its anchorage to earth and was hurtling up the strait through mid-air, ready to crash down to destruction the instant its winged driving-force failed.
Low buildings of hexagonal shape, arranged in irregularly variant hexagonal patterns, extended mile upon mile. From the roofs of the structures lacy spires soared heavenward; inter-connected by long, slim cantilever bridges whose prodigious spans seemed out of all proportion to the gossamer delicacy of their construction.
I did work out once a modification of bridge trusses which some might call an invention, new principle in the application of trusses to bridge structure. Allows for a longer suspension span on cantilever bridges." "But this Zariba Dam," remarked Lord James; "I've yet to learn, myself, just how you worked it out."
Alexander, still standing at the end of the river span, saw the lower chord of the cantilever arm give a little, like an elbow bending. He shouted and ran after the second gang, but by this time every one knew that the big river span was slowly settling.
Modern ingenuity had been employed on such trifles as locomotive engines, electric cables, and cantilever bridges; on elaborate devices for bringing uninteresting people nearer together; the ancients had been almost as foolish, because they had mistaken the symbol for the thing signified.
Lord Cantilever is the head of his party. Its august, and, I presume, reverenced leader. He is papa's particular fetish. I am not sure that he does regard him as being any lower than the angels, but if he does it is certainly something in decimals. My suggestion seemed as outrageous to him as his suggestion seemed to me.
Love is a great engineer, and Eustace learned fast from him. He was full of the fresh originality of youth; and the place took his fancy and impressed itself upon him. Gazing at it each day, there rose up slowly by degrees in his mind, like a dream, the picture of a great work on a new and startling principle a modification of the cantilever to the necessities of the situation.
On the 21st September the Fraser River was crossed early in the morning over a steel cantilever bridge, and the line runs down the gorge of the Fraser River to Port Moody, reached at noon. The train had thus been travelling from 8 p.m. on the 15th September to 12 noon on the 21st, apparently a total of 136 hours; but, allowing for the gain of three hours in time, an actual total of 139 hours.
Sometimes there was no natural bridge over a crevasse, and then, choosing the narrowest and shallowest place in it, we made a bridge, excavating blocks of hard snow with the shovels and building them up from a ledge below, or projecting them on the cantilever principle, one beyond the other from both sides.
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