[Frost and fire : natural engines, tool-marks and chips : with sketches taken at home and abroad by a traveller] . thedimensions of small icebergs, one 600 feet thick would show50 feet; 500 feet would show the same ; and 300 feet, 40. The visible height of an iceberg is no certain measure ofits size. One may be almost pure ice, and float as glacier-iceflioats in sea-water ; another may be so freighted as to sink;or it may float so as to groimd at any depth. Moreover, the 378 shape of the lump affects its height. In one case a sharppeak may rise high, in another a blunt end may be upper-most. I
[Frost and fire : natural engines, tool-marks and chips : with sketches taken at home and abroad by a traveller] . thedimensions of small icebergs, one 600 feet thick would show50 feet; 500 feet would show the same ; and 300 feet, 40. The visible height of an iceberg is no certain measure ofits size. One may be almost pure ice, and float as glacier-iceflioats in sea-water ; another may be so freighted as to sink;or it may float so as to groimd at any depth. Moreover, the 378 shape of the lump affects its height. In one case a sharppeak may rise high, in another a blunt end may be upper-most. In these floating masses the centre of gravity is not afixture. It is constantly changing. When a heavy stone or a mass of rubbish faUs from theend of one spoke in the wheel, that side becomes lighter; itrises, and the wheel turns round. The system rolls in thewater tiU it recovers equilibrium. Icebergs constantly roUover, and this seems to be a sufficient reason. The woodcutwas drawn from a model which was made as described andworked in this way. -d*^ m Floatingsmnuballs, slo-mty. Jh Smallcotiical Stratified.
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Keywords: ., bookpublisheredinburghsn, booksubjectgeo, booksubjectmeteorology
