Collection 2 - "Alien Orreries"

There's a mechanism I've wanted to explore since the cocktail ring project.
The gear train shown here results in counter-rotating wheels, which I think would be an interesting aesthetic motion.
This old book has been invaluable, and it's so well regarded that it's been entirely digitised here.
Epicyclic train of 3 bevel gears

BEVEL GEAR
Variable circular motion

CROWN/CONTRATE GEAR & PINION