Recently it was my good fortune to repair a French Statue Clock that featured a "conical" or "rotary" pendulum. It was my first encounter with this type of escapement. But it was a delightful experience. Part of the escapement was missing so it took a bit of research to realize that the pendulum actually did swing in a circle. Emperically I discovered a few important things that makes these clocks run well. It would be great to compare notes with anyone who owns or has serviced one of these clocks.