Rotation
There are 2 different modules. One combining a synchrotransmitter with a 10 turn potentiometer using a timing belt and another one
combining an Incremental Quadrature Rotary encoder with also a 10 turn potentiometer.
Synchro and Resolver Engineering Handbook
MUIRHEAD AEROSPACE Synchros
Incremental Quadrature Rotary encoder
ECW - Digital Contacting Encoder
Potentiometer