CHAOTIC OSCILLATIONS.
Chaotic pendulum.
The apparatus consists of a double upper arm
connected to a bearing mounted support with 360 of
freedom and a shorter lower pendulum mounted
between the upper pendulum arms which also has 360
of freedom. The apparatus is released at the top of it's
arc of motion with the pendulums together and results
in a different pattern of motion each time it is released.

SIMPLE HARMONIC MOTION.
Oscillations: Mass on a Spring.
'mass-compensated'. It is more tightly wound at the top than at the bottom, to
compensate for the weight of the hanging spring. When hanging, the smaller diameter end is at the top, and the larger diameter end is at the bottom. Do not overload
the spring!