This publication was motivated by Krafft’s accidental observation of a suspended clock setting itself in constant motion as a pendulum. His analysis of the phenomenon led him to conclude that the vibration of the clock was solely due to imbalances in the clock's balance wheel. Next, he conceives a 'little machine' as he called it, in which a straight bar loaded by small weights at its extremities is free to oscillate about the center of gravity of a regular suspended clock. He then investigates different oscillating conditions, by calculating moments with different weights and lengths of the bar arms, to find conditions to attain oscillating excursions in a right angle, excursions with maximum amplitude, and showing that the vibrations of the whole clock are rendered more sensible, the shorter is the height of the suspension.
Bistafa, Sylvio R.
"On a New Class of Oscillations,"
Euleriana: 2(1), pp.6-10.
Available at: https://scholarlycommons.pacific.edu/euleriana/vol2/iss1/3