## Christiaan Huygens' the pendulum clock, or, Geometrical demonstrations concerning the motion of pendula as applied to clocks |

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arc FH ascend assumed attached axis of oscillation base body falling center of gravity center of oscillation centrifugal force CHRISTIAAN HUYGENS circle circumference clear clock composed conoid construction cord cycloid demonstration descent described diameter distance crossed divided draw drawn equal evolution figure OQP follows Galileo Galilei geometrical given greater half the velocity half-cone Hence Huygens hyperbola inclined indicated isochronous pendulum larger latter latus rectum length less located magnitude ABCD moved multiplied number of small Oeuvres parabola paraboloid parallel parallelepiped pendula Pendulum Clock perpendicular plane figure point G point of suspension Q.E.D. PROPOSITION radius ratio rectangle AGH right angles rotating sector simple pendulum small portions solid ABCD sphere square of BC straight line FG string subcentrix surface suspended tangent tion uniform motion uniform velocity velocity acquired vertex wedge cut wheel