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§ 23. Graph representing Weakness of a Divided Force. In Fig. 5a, a pair of conjugate curves have been plotted backwards from the vertical datum representing the finish, and an upper graph has been added representing

Fig. 5a.

Fig. 5b.

the total of the "Red" force, which is equal in strength to the "Blue" force for any ordinate, on the basis that the "Red" force is divided into two portions as given by the intersection of the lower graph. In

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