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Updated: June 25, 2025
The following formulæ will give all the stresses in the bowstring girder, without the necessity of any diagrams, or basing any calculations on the assumed action of any of the members of the girders: These results show that the method generally adopted in the construction of bowstring girders is erroneous; and one consequence of the method is the observed looseness and rattling of the long embraced ties referred to at the commencement of the article during the passage of the live load; the fact being that they have at such times to sustain a compressive stress, which slightly buckles them, and sets them vibrating when they recover their original position.
To save myself from a violent collision with his tail planes I was compelled to cling desperately to the frail wood and wire girder of the fuselage, and it was in this position that I was carried the length of the flying ground.
On the other hand, a cantilever or continuous girder bridge in three spans although such structures have been erected in similar localities could not enter into comparison of simple economy of material, because such a design would entirely disregard the anomaly that the greater part of the structure, viz., the side spans, being necessarily constructed to carry across a large space, would be too near the ground to justify the omission of further supports.
Jim wondered if the kids in the old swimming hole missed him. He wished he could lie on his back and talk to Phil Chadwick again. As he stared wistfully upward, a girder on the 18th floor twisted suddenly and swept across a temporary floor, brushing men off like crumbs. Jim saw three men go hurtling and bounding down, down to the street. He could not hear them scream above the din.
There was a noise just when the clock broke like when a steel girder falls on the sidewalk." "That noise was just before the clock broke, Bubbles. And it was loud enough to drown the noise of our friend's gun. Clever work, though, to have to pull the trigger at a given moment, and to make such a close shot. Probably had his gun screwed in a vise."
"If he gets power," said the youngest brother, smiting the ground with his girder. "As he will," said the eldest, staring at his feet. The middle brother ceased his lopping, and his eye went to the great banks that sheltered them about. "Then, brothers," he said, "our youth will be over, and, as Father Redwood said to us long ago, we must quit ourselves like men."
Now that she had driven him away, she found a girder wanting in her life's neat structure, which accordingly had begun to wobble uncomfortably. He had had no intention of dashing out her brains or even of giving her a beating. In her heart she repented.
I think none of us will need to hold the weight of the others with the rope. Wade, will you get three fairly good-sized pieces of metal, something we can tie a rope to? I think we can get down here without the help of anyone else. Morey, will you cut the rope in three equal pieces while I help Wade tear loose that girder?"
The so-called theoretical weight is that which the structure would have if no part required stiffening, leaving out also all connections and all wind bracing. The moving load is taken at one ton per foot lineal, and the strain on the iron at an average of four tons per square inch. The proportion of the girder is taken at 1 in 8.
Bide-the-Bent," replied Girder; "ane canna get their breath out here between wives and ministers. I ken best how to turn my ain cake. Jean, serve up the dinner, and nae mair about it." Nor did he again allude to the deficiency in the course of the evening.
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