Atmosphere : a philosophical work / by George Woodhead.

  • Woodhead, George.
Date:
1852
Catalogue details

Licence: Public Domain Mark

Credit: Atmosphere : a philosophical work / by George Woodhead. Source: Wellcome Collection.

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    tin vessel containing water be partly im- mersed in a vessel of boiling water, the water in the tin vessel may be raised to boiling heat,* but it will not boil. Prom this it appears that heat is not the cause of the agitation in boiling water; for here is the requisite heat without the boiling. But the air has not free access to the tin vessel, being excluded by the water which surrounds it; and hence the reason why the water in the tin vessel does not boil. If .a tumbler or common drinldng-glass be put into a pan of water sufaciently deep to cover or completely immerse the glass, nature of which was unknown. Some supposed heat to be a subtle fluid, whose particles were invisible and imponderable, of extreme tenuity, repulsive of each other, and attractive of the particles of other matter.' Others regarded heat as consisting of some motion of matter, or the particles of matter. And some thought that heat was caused, or produced, by the vibrations or undulations of a peculiar elastic fluid or ether uni- versally difiused. * The degrees of heat are measured by a thermo- B 2
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