globum Rota, cujus diameter sit AO , describantur duæ semicycloides AQ , AS , quæ globum interiorem tangant in Q & S & globo exteriori occurrant in A . A puncto illo A , filo APT longitudinem AR æquante, pendeat corpus T , & ita intra semicycloides AQ , AS oscilletur, ut quoties pendulum digreditur a perpendiculo AR , filum parte sui
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