An introduction to natural philosophy. Or, Philosophical lectures read in the University of Oxford anno Dom. 1700. To which are added the demonstrations of Monsieur Huygens's Theorems, concerning the centrifugal force and circular motion / By John Keill ... Translated from the last edition of the Latin.

  • John Keill
Date:
1720
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Licence: Public Domain Mark

Credit: An introduction to natural philosophy. Or, Philosophical lectures read in the University of Oxford anno Dom. 1700. To which are added the demonstrations of Monsieur Huygens's Theorems, concerning the centrifugal force and circular motion / By John Keill ... Translated from the last edition of the Latin. Source: Wellcome Collection.

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    -c fimply fufpended by it, 6 0s _ Ler AB be a Pendulum’ moved through: the , Quadrant, FB, bife&: AB in CG; through : which draw, CE. perpendicular to AB, and meeting, the Circumference in.E. | If the. Pendulum defcended raj Tru w^ L1 E £g » [| only through the Arch EB, it would acquire in the Point B the fame Velocity, asif it had defcended through C B — 7 of the Diameter [by Corol. 1. Prop: 38. of the 15th Le&.] fo that [by Theor. 5.] it will have in the Point B a Centrifugal Force equal to its Gravity: and confequently the Gravity and the String with-twice a greater Force, than it would through AB, But AB is to BC in a duplicate Ra- through BC; wherefore alío AB will be to BC [by 'Iheor.3.] as the Centrifugal Force of the moving Body in the Point B after the Defcent . through FB, to the Centrifugal Force in the Point .B,.after the Defcent cu through EB, So that sae