[Frost and fire : natural engines, tool-marks and chips : with sketches taken at home and abroad by a traveller] . smoke, trees,snow-drifts, sand-drifts, waves, and clouds. These have a meaning which can be read and translated ;tliey shew movements in air by their forms. Motion slicwsforce, and its direction ; its nature is found by experiment. AIR. 59 Experiment proves that Heat, Cold, and Weight are forceswhich produce upward, lateral, and downward movements inair, and so mould forms, and wear solids. Observation finds these forces distributed in the world soas to fulfil conditions which pro
[Frost and fire : natural engines, tool-marks and chips : with sketches taken at home and abroad by a traveller] . smoke, trees,snow-drifts, sand-drifts, waves, and clouds. These have a meaning which can be read and translated ;tliey shew movements in air by their forms. Motion slicwsforce, and its direction ; its nature is found by experiment. AIR. 59 Experiment proves that Heat, Cold, and Weight are forceswhich produce upward, lateral, and downward movements inair, and so mould forms, and wear solids. Observation finds these forces distributed in the world soas to fulfil conditions which produce these movements in air ;and that heat comes from the sim, and from the earth. Socloud-forms and air-marks shew the mechanical action ofsolar and terrestrial heat, and of weight, in the air. They aretool-marks. All atmospheric movements, great and small, can betraced to one general law, which governs gases; and fluidsalso. But before a law can be applied, it must be wellknown to those who apply it; and the laws of natural venti-lation are often unknown to men who try to fill houses andnimes with pure Bent Trees ,Sketched in a lulin. 1S03. CHAPTEE VIII. If heat be a force which moves all gases away from centres,then for that reason alone it is probable that heat also movesliquids, and in the same direction. It is not necessary to begin at the dial-plate, and workthrough a whole train of machinery, in order to find thecentre of every wheel; or to go back to the rim of each wheelto find the axle for every spoke. All British railways con-verge on London, but all railway journeys up to town neednot begin at the furthest station. Without travelling roundthe world, we know that chimneys at the Antipodes smokeopposite ways, and that blacks fall towards each other, andthe earths centre. If a natural law is known, its results follow. Powerswhich move the atmosphere and all gases, which radiate >from, and meet at a point, bring a traveller to a large junc
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Keywords: ., bookpublisheredinburghsn, booksubjectgeo, booksubjectmeteorology
