Recently I saw a replica of a Synchronome electric master clock on display
in a private museum. I noticed that part of the movement is a lever
controller for manual operation (usually in the lower left hand side of
the case, in pictures I have seen of other examples of this type of clock)
with three positions, marked "N," "R," and "A." What is the function of
this lever, and what do the letters n, r, and a stand for? (No jokes
about the National Rifle Assoc., please). Regards, Ian D.