Newton's __, Device With Swinging Spheres

This page is the CodyCross answer for the clue below from Campsite Adventures, Group 835, Puzzle 5 (Meditation).

Question is: Newton's __, Device With Swinging Spheres

and the answer is: CRADLE

Word Meaning:

CRADLE — A bed or cot for a baby, oscillating on rockers or swinging on pivots.

Definitions from Wiktionary.

Newton's __, device with swinging spheres — CodyCross Answer | CodyCross Solutions