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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.
The unimaginative mechanic whose wits were scattered by this fantastic proposition used his bit of cotton waste as a handkerchief, and remarked with vague politeness that it was a pity the gentleman was not an engineer. But Septimus deprecated the compliment. He looked wistfully up at the girders of the glass roof and spoke in his gentle, tired voice.
All structures were put on the girders "C" before continuing the excavation on the sides of the avenue because, in case of a slide of rock, there would be less danger than to individual structures. The outside piers, on which the girders "C" rested, might even be lost, without affecting the stability of the structure, and posting could readily be done beneath these girders in case of necessity.
As reminder of anxious days, we noted a few skeleton roofs, and the giant Virgin Mary in tarnished gilt, who, after withstanding bombardments sufficient to have wrecked a cathedral, leaned over at right angles to her pedestal, suspended in apparently miraculous fashion by the three remaining girders.
At any moment they may be called upon to halt, and crowd into the roadside, while a transport-train passes carrying rations, and coke, and what is called "R.E. material" this may be anything from a bag of nails to steel girders nine feet long up to the firing-line.
He wanted to think about the aeropile, to recall every item of his previous experience. He waved the people from him, saw the man in yellow dropping off through the ribs, saw the crowd cleft down the line of the girders by his gesture. For a moment he was motionless, staring at the levers, the wheel by which the engine shifted, and all the delicate appliances of which he knew so little.
For instance, in one sector alone the Austrians were forced to retreat so rapidly that the Russians were able to gather in, according to official reports, twenty-one searchlights, two supply trains, twenty-nine field kitchens, forty-seven machine guns, 193 tons of barbed wire, 1,000 concrete girders, 7,000,000 concrete cubes, 160 tons of coal, enormous stores of ammunition, and a great quantity of arms and other war material.
And thinking it over afterward, Gwendolyn felt deep gratitude for the promptness with which They acted. For having received the money, They advanced into that terrible road, faced half-about, and halted. The angry song of the bee was faint then. For the slender figure was speeding past those patches of light that could be seen through the girders of the Barn.
With my gear all ready beside me, I sat on the matted floor of the hut in which I lived, smoking my pipe and listening to the fury of the squalls as the force of the wind bent and swayed the thatched roof, and made the cinnet-tied rafters and girders creak and work to and fro under the strain.
This unyielding sureness of reality sometimes crosses our will, and very often leads us to disaster, just as the firmness of the earth invariably hurts the falling child who is learning to walk. Nevertheless it is the same firmness that hurts him which makes his walking possible. Once, while passing under a bridge, the mast of my boat got stuck in one of its girders.
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