Rotation axle

This picture shows the construction of the year rotation axle. The toothed disc #168b is driven by a chain from a sprocket wheel #96a on a vertical axle. A 133 teeth gear wheel #27b on that same axle is driven by a pinion #26 on a second vertical axle at the other side of the arm. A pinion #25 on that axle is driven by a worm-wheel #32 on the main axle.
Also visible is the collecting shoe that is mounted to the rotating arm but is electrical insulated from it. The weight of the rotating arm presses the two pulleys #23a firmly to the flanged ring #167b ensuring a good electrical connection. From the collecting shoe a single wire goes to the motor. The return lead from the motor is connected directly to the rotation arm. No loose wires are visible when the orrery is operated.