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Rating
Rating the clock means adjusting the time keeping so the clock neither gains nor loses
time while it is running. This is done by raising or lowering the pendulum bob using the
rating nut on the bottom of the pendulum. Stop the pendulum to make all adjustments
and then gently start the pendulum swinging when done. Minimize the amount of contact
with the polished brass since the oils on a person’s hands will leave dark splotches.
Touch the edges when at all possible or use a rag over the hand. Rotating the nut to the
right speeds up the clock by raising the bob. Rotating the nut to the left slows the clock
by lowering the bob. One complete revolution of the rating nut will change the time
keeping by one minute per day. It is important to know how long the clock has run
without being reset before making any changes to the rate. If the clock is seven minutes
off in one week, it will be necessary to make one complete turn of the rating nut. If it is
seven minutes off in one month, ¼ of a turn is all that is necessary!
Cleaning
All cleaning of the mechanism (movement) should be done by a professional. It is
recommended to have the movement serviced every 5-7 years or sooner if the time
keeping becomes erratic. At the time of this restoration, LaPerle clock oil was used
throughout.
The glass may be cleaned on the outside with the usual care given to prevent soaking the
wood. The inside of the lower glass shouldn’t be cleaned unless absolutely necessary.
The gold leaf lettering is very delicate and could be wiped away with nothing more than
Windex. If it is necessary to clean the lower inside glass, spray the cleaning solution on a
cloth rather than directly on the glass and avoid the lettering during the cleaning process.
The upper glass may be cleaned on the inside using the same care as the outside with the
exception that time be given to allow the fumes to dissipate so they are not trapped in the
case with the movement. Ammonia will break down the oils causing them to fail.
1 complete turn = 1 minute per day rate change