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T2s <br /> F- PD <br /> T2s <br /> Figure No. A2 <br /> 2) Cone unit force, T2, the latitudinal unit force. Also known as the circumferential unit force. <br /> See Figure No. A3 <br /> R2, radius of curvature of cone at A <br /> R2 =AB/cos(a) <br /> R2 = 96.99356 inches <br /> D <br /> T2 <br /> dq <br /> shell 1" width along line AC <br /> dq <br /> R2 � <br /> A � D <br /> F R2 <br /> I � <br /> C <br /> A B �� <br /> C a <br /> cone <br /> bottom T2 <br /> Figure No. A3 <br /> Sum of FX= 0 <br /> F =the force on 1 inch wide section F- 2T2*Sin(dq) = 0 <br /> of cone at point A with an infinitesimal 2PdgR2 = 2T2Sin(dq) and for small dq, Sin(dq) =dq <br /> PR2 = <br /> arc length = 2 x dq T2 <br /> T2 = <br /> F = P(1)(2)(dq)(R2) PR2 <br />