. Frost & fire : natural engines, tool-marks & chips : with sketches taken at home and abroad by a traveller. °, Sea freezes. 28°, Sea freezes. Floats, ice. ling. 2400 feet. 31°, Polar Sea, 2300 feet. ^ ^ 34°, 5400 feet. 3 * Heavy cold water sinks. Warm light water rises Warmlig ht water rises. Heavy cold water sii ks. =:=-^-:::- Weight. Heat. Weight. Water is found in three conditions at different temperaturesand pressures, at different distances from the earths centre ;and the order of the arrangement above the solid crust is 85 Weight and Cold. 1 Gaseous matter = Watery vapour and air. 2
. Frost & fire : natural engines, tool-marks & chips : with sketches taken at home and abroad by a traveller. °, Sea freezes. 28°, Sea freezes. Floats, ice. ling. 2400 feet. 31°, Polar Sea, 2300 feet. ^ ^ 34°, 5400 feet. 3 * Heavy cold water sinks. Warm light water rises Warmlig ht water rises. Heavy cold water sii ks. =:=-^-:::- Weight. Heat. Weight. Water is found in three conditions at different temperaturesand pressures, at different distances from the earths centre ;and the order of the arrangement above the solid crust is 85 Weight and Cold. 1 Gaseous matter = Watery vapour and air. 2 Solid = Ice and air. 3 Fluid = Water and air. Heat. 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 cutting-wheels, 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 D Elevation. Ill of the Sn^fkll Peninsula, opposite to sunset, June 27, 18<;-2. CHAPTER IX. DENUDATIONâTIME. There is an ingenious device for sculpturing marble, whichillustrates the working of engines wliicli 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 circidating atmosphere chargedwith water. At the other end of the bar a point touches the model, anduniversal j(5ints allow the bar to move every way. But theengine is so contrived, that if the point rises, the wheel risesas much ; if it falls,
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