Vietnam or Thailand ? Vote for the TOP Country of the Week !
If, instead of being perfectly at right angles, the plane subtends with the axis an angle of 89° 59´, we have an ellipse which no human eye, even when aided by an accurate pair of compasses, can distinguish from a circle.
But I maintain, that I, the Professor, am a good listener. If a man can tell me a fact which subtends an appreciable angle in the horizon of thought, I am as receptive as the contribution-box in a congregation of colored brethren.
For the same reason the travellers were unable to sight the immense development of granite-embedded quartz, which lurks amongst the hills to the inland or east, and which here subtends the whole coast-line. They imagined themselves to be in a purely Secondary formation of gypsum and conglomerates, cut by a succession of Wady-beds like the section between El-Muwaylah and 'Aynunah.
Not the least curious part of this outcrop is the black thread of iron silicate which, broken in places, subtends it to the east: some specimens have geodes yielding brown powder, and venal cavities lined with botryoidal quartz of amethystine tinge. In other parts of the same hills we found, running along the "Mara," single and double lines of this material, which looked uncommonly like slag.
"You certainly can't call this thing a periscope it's no more a periscope than I am a polyp. When you look through this plate, it's better than looking out of a window it subtends more than the angle of vision, so that you can't see anything but out-of-doors I thought for a second I was going to fall out. What do you call 'em, Dunark?" "Kraloto. That would be in English ... Seeing-plate?
Nor has he since lost them altogether in crossing the storm-tossed Atlantic to our shores. Instead the rich vigor of the brine subtends them and bears them, tanged with salt, to our deeper delectation.
But I maintain, that I, the Professor, am a good listener. If a man can tell me a fact which subtends an appreciable angle in the horizon of thought, I am as receptive as the contribution-box in a congregation of colored brethren.
Antwerp, then the commercial centre of the Netherlands and of Europe, stands upon the Scheldt. The river, flowing straight, broad, and full along the verge of the city, subtends the arc into which the place arranges itself as it falls back from the shore. Two thousand ships of the largest capacity then known might easily find room in its ample harbours.
If we could find out what angle that bit of arc subtends, a mere matter of multiplication would give us the size of the earth. But how determine this all-important number? The answer came through reflection on the relations of concentric circles.
The Fiskiyyah or "tanks," as carefully built, were of all sizes; and the wells, which appeared to be mediaeval, were lined with stones cut in segments of circles: we shall see the same curve in Sultan Selim's work near Ziba. The greatest feat is an aqueduct which, sanded over in the upper part, subtends the left side of the valley.
Word Of The Day