Answer
Pendular Oscillations, the rhythmic swings of a suspended object such as a pendulum, were one of Allais's primary areas of study in physics. His investigations delved into the intricacies of this motion, aiming to unravel the underlying principles that govern the back-and-forth movements of pendulums. By meticulously observing and analyzing these oscillations, Allais sought to deepen our understanding of this fundamental physical phenomenon.