extremes of temperature
The angle of skew, or obliquity, is the angle which the axis of the archway, A A, makes with a perpendicular to the face of the arch, B C A B. The span of the archway, on the square, as it is called (that is, the perpendicular distance between the abutments), is less than the span on the skew, or parallel to the face of the arch, in the ratio of the cosine of the obliquity to unity. It is the span on the skew which is equal to that of the corresponding symmetrical arch.
on the square,
Plus, there's always been a healthy rivalry between the tabs and us, but I'm sure this has nothing to do with it ;-)
He rose to his knees, for he had been sitting in the darkness near the copper.
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