[Frost and fire : natural engines, tool-marks and chips : with sketches taken at home and abroad by a traveller] . vements of ocean and air. Fluid water being heavy at the Poles and light betweenthe Tropics, would move like air and clouds if it were deepas the atmosphere ; and the sea does, in fact, move diagon-ally on meridians, where land will permit. Water, then, is found in three conditions at different tem-peratures and pressures, at different distances from the earthscentre ; and the order of the arrangement above the solidcrust is Weight and Cold. 1 Gaseous matter, Air and watery vapour
[Frost and fire : natural engines, tool-marks and chips : with sketches taken at home and abroad by a traveller] . vements of ocean and air. Fluid water being heavy at the Poles and light betweenthe Tropics, would move like air and clouds if it were deepas the atmosphere ; and the sea does, in fact, move diagon-ally on meridians, where land will permit. Water, then, is found in three conditions at different tem-peratures and pressures, at different distances from the earthscentre ; and the order of the arrangement above the solidcrust is Weight and Cold. 1 Gaseous matter, Air and watery vapour. 2 Solid, Ice and air. 3 Fluid, Water and i 85 Two opposing forces meet at some layer of the sphere,and so work the air and the water-engines, to which geologi-cal denudation is ascribed. Characters which these engraveupon the solid earth are written with heat and weight. But because the double engine consists of many cuttingwheels, and each wheel makes a different tool-mark, rockswhich bear marks of air and of water, are variously markedby the contriver of the engine, which carves hills and bu w. Fin. IS. Plan and Sketili of the Sn^fell TeniDsula, opjiosite to , June 27, 1862. CHAPTEE IX. DENUDATION—TIME. There is an ingenious device for sculpturing marble, whichillustrates the working of engines which carve hills. An artists thought is modelled in clay, and cast in plasterof Paris. A block of marble is laid beside the solid thought,and the engine is placed between the stone and the is got out of fire and water, or water and weight, andit is passed through a train of wheels, strings, and levers,to a small cutting wheel which revolves rapidly at the endof a bar. Let this wheel stand for a circulating atmosphere chargedwith water. At the other end of the bar a point touches the model, andimiversal joints allow the bar to move every way. But theengine is so contrived, that if the point rises, the wheel risesas
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Keywords: ., bookpublisheredinburghsn, booksubjectgeo, booksubjectmeteorology
