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No one but has heard of the dancing-floor or the dinner-table cut from a single cross-section; and probably few but have seen some of the fibrous bark of unbelievable thickness. The Mariposa, Calaveras, and Santa Cruz groves have become household names.
A few localities excepted, the canyon does not form a single gash; nor has it the usual V-shape of canyons in regions of plentiful rainfall. On the contrary, its cross-section takes the form of a succession of steps and terraces, as though the river cut the channels successively in decreasing widths.
Every bargain is a cross-section in three tenses of a man. A bargain tells everything about people who they are, and what they are like. It also tells what they are going to be like unless they take pains; and it tells what they are not going to be like too sometimes, and why.
It is popularly called 'El Aqueducto, perhaps from some fancied resemblance to an aqueduct but the name is evidently misapplied." Yet he admits that the cross-section of the wall, diminishing as it does "by graduations or steps on both sides," "might appear to conflict with the hypothesis of its being a work of defense or fortification" if it occupied "a different position."
That eightfold increase of proportion enabled the resistance of the conductor of electricity from the generator to the burner to be increased eightfold, without any increase of percentage of loss of energy in that conductor, or decrease of percentage of development of heat in the burner; and thus enabled the area of the cross-section of that conductor to be reduced eightfold, and thus to be made with one-eighth of the amount of copper or other metal, which would be required if the reduction of diameter of the burner from one-thirty- second to one-sixty-fourth of an inch had not been made.
Above and between these latter, the cone-shaped roof of the cimborio, properly speaking, is sloping and triangular in its cross-section. This body, less Oriental in appearance than the one in Zamora, impresses one with a feeling of greater awe, thanks to the great diameter as compared with the foreshortened height.
The tower is of a later date than the body of the cathedral, as is easily seen by the triangular pediments which crown the square windows: it is composed of three bodies, as is generally the case in Spain, the first of which is square in its cross-section, possessing four turrets which crown the angles; the second body is octagonal and the third is in the form of a pyramid terminating in a spire.
Furthermore, it seemed important to me to dig a tunnel into the Ayahuaycco hillside at the exact point from which we took the bones in 1911. So I asked Mr. K. C. Heald, whose engineering training had been in Colorado, to superintend it. Mr. Heald dug a tunnel eleven feet long, with a cross-section four and a half by three feet, into the solid mass of gravel.
The spring would represent the helix, and the surface of the water the moving plane. Concentrating attention upon this surface, you would see a point the elliptical cross-section of the wire where it intersected the plane moving round and round in a circle. Next conceive of the wire itself as a lesser helix of many convolutions, and repeat the experiment.
The new tunnel follows the line of the Claudian emissary which though badly executed was admirably engineered but its axis is at a somewhat lower level than that of the old gallery, and its cross-section is about two hundred and fifteen square feet, allowing a discharge of about 2,400 cubic feet to the second, while the Roman work had a cross-section of only one hundred and two square feet, with a possible delivery of 424 cubic feet to the second.
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