which have their own free motion, or consist of fluid

Full Title

Gearings based on repeated accumulation and delivery of energy > Rotary transmissions with mechanical accumulators, e.g. weights, springs, intermittently-connected flywheels > Gearings for conveying rotary motion with variable velocity ratio, in which self-regulation is sought > based essentially on inertia > having orbital members influenced by regulating masses > which have their own free motion, or consist of fluid