A unique trifilar pendulum was constructed at Frankford Arsenal which proved to be an accurate tool for the determination of momen':s of inertia of non-homogeneous objects.The pendulum was used with a calibration curve. The curve was generated by plotting a quantity calculated from the weight and the period squared of a number of homogeneous solids of revolution of increasing size as ordinates, against the calculated (using handbook formulae) moments of inertia of these solids as abscissae.The moment of inertia of an unknown was obtained by weighing the object, establishing its period on the pendulum, locating a quantity calcu]ated from its period squared and its weight as an ordinate on the calibration curve, and finding the moment of inertia as the corresponding abscissa.There are specialized techniques used in operating the pendulum and some unique features in its design for which patents have been applied. The need for such unique features is established, and error analysis shows this trifilar pendulum accurate to 0. 5%.It is concluded that the trif;1ar penLdulum, if properly constructed, has certain advantages over the torsion rod pendulum with no more disadvantages.iii
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