Such functioning circuitry as exists in such devices usually has no obvious way ( motor, solenoid, etc . ) to connect to any rotating joint in the device either, meaning the devices are often entirely dependent on the ideomotor effect to function.
12.
:: Yes, good point, Flybynight, and good idea, Googlemeister-cable's hooked to a rotating joint on the moon's axis; also, it's able to play in and out to make up for Psamathe moving closer and further away.
13.
The three basic kinds of joints are fixed joints ( which permanently connects two shapes together to form a larger solid shape ), rotating joints ( which allow rotational movement ), and sliding joints ( which give objects one-dimensional linear movement, much like a pneumatic piston ).
