...Hirokazu Minami The property of the added air mass of a plane membrane suspended between supports and vibrating in x‐y plane with a half‐sine fundamental mode is obtained again by analysis with a normal method which differs from that presented in the last proceedings. The method used in this paper...

...Jerzy Zajaczkowski Torsional vibrations of a shaft induced by a zigzag mechanism in a sewing machine with an oscillatory hook are studied in this paper. The dynamic equations of the motion are derived using the principle of virtual work. The discrete forms of the functions relating the motion...