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action amount amygdules appear atmosphere atomic body bogs boiler Breccia carbon cause Cave-earth Cavern cent centre of gravity coal colour copper corundum density deposits described diameter distance earth ecliptic effect electricity energy engines evidence exhibit existence experiments fact feet force fuel funnel furnace Geological Glacial period greater heat inches iron Jupiter Kent's Cavern lake leading constituents light London lunar lunar atmosphere mass matter metacentric height metal miles mineral Miocene moon motion number of elements observed obtained ordinary passed peat phenomena phrenology planets pole pole star Portage Lake portion present pressure probably produced Prof quantity quartz remarkable rock Saturn ship side species specific gravity stalagmite star steam storm surface symmetric determinant temperature theory tons tornado trees Tschermakite tube velocity vibrations waves weight whilst wind yards
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275 페이지 - ... that the rising of the pith was only due to currents of air, and that at this near approach to a vacuum the residual air was too highly rarefied to have power in its rising to overcome the inertia of the straw beam and the pith balls. A more delicate instrument would doubtless show traces of movement at a still nearer approach to a vacuum ; but it seemed evident that when the last trace of air had been removed from the tube surrounding the balance — when the balance was suspended in empty space...