Cycloidal channels made for King George III by George Adams in 1762, Fleet Street, London.

The cycloidal channels are a piece of demonstration equipment that was made for King George III in 1762 by George Adams, just two years after he ascended the throne in 1760. It was part of Adams' mechanics lectures and was intended to be used with the philosophical table.It allowed the demonstrator to compare the velocity of falling bodies using rolling spheres. It was designed so that no matter where the sphere was position on the channels, it will always took the same length of time to reach the lowest point.