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
A significant aspect of the Great Proletarian Cultural Revolution has been to reveal the least stable areas of China geographically and politically. One of these is Inner Mongolia. Also, the events of the upheaval— in direct contradiction to the Maoist dictum that “the Party must always control the gun, the gun must never be allowed to control the Party”— have caused a breakdown in Party and Government authority and a shift to military control in many parts of China: administrative organs at provincial, municipal and local levels have been replaced by People's Liberation Army (PLA) directed “Revolutionary Committees.” In most areas of China, the political upheaval can be ascribed to a power struggle between the Party, Red Guards and other semi-organised groups. However, the Cultural Revolution in the Inner Mongolian Autonomous Region takes on added significance in that “local nationalism” among the Mongol national minority played an important role in the conflict between the established political structure and the efforts of the Maoists to “seize power.”
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