Elements of agriculture and vegetation. To which is added, an appendix, for the use of practical farmers / [George Fordyce].

  • Fordyce, George, 1736-1802.
Date:
1796
Catalogue details

Licence: Public Domain Mark

Credit: Elements of agriculture and vegetation. To which is added, an appendix, for the use of practical farmers / [George Fordyce]. Source: Wellcome Collection.

    107/122 (page 103)
    [ io3 ] FIG. IV. Suppofe N a Sphere of Iron immerfed in Wa- ter, it would be furrounded by the Particles of Water W W, £s?r. in order to fink through the Water it mull feparate the Particles DD from one another, and therefore mull overcome their Attraction, and it muft Hide along the Particles C B, and therefore that FriCtion muft alfo be overcome. If therefore the Difference of fpecific Gravity fhould not be fufficient to overcome thefe Refinances, the Sphere would fwim. But the Refiftance of the Attraction of the Particles DD will be the lame nearly in a large and a fmall Sphere, and the total Difference of the Gravity of a fmall Sphere and an equal Bulk of the Fluid, will be lefs than the total Difference of the Gra- vity of a large Sphere and an equal Bulk of the Fluid; if therefore you could diminifh the Sphere until that Difference is lefs than the At- traction of the Particles DD it would fwim. FIG. V. As the Particles of Bodies do not touch but adhere by Attractions, and Repulfions, they may be confidered as aCting at the Sphere, where their Attractions are in Equilibrio. If there be four Particles P P P P, they may be confidered as producing their EffeCts at the Spheres A A A A. FI G.