Lengthen the pendulum by moving the bob down.
Pendulum wall clock runs slow.
Denser air causes the pendulum to move more slowly.
This is adjusted by turning the nut at the bottom of the pendulum.
The length of the pendulum determines how fast it swings so you need to either lengthen or shorten it.
Each turn of the screw slows the clock by two minutes per 24 hour period.
Changing the speed of time keeping is accomplished by moving the pendulum disk up or down.
Understanding the mechanics of your cherished time piece will help you fix problems that can occur without having to drag the clock to a repair specialist.
The clock will run slower.
To speed up the clock tighten the nut turn it toward your right.
If the clock is running slow turn the pendulum nut clockwise to increase the rate.
Increasing the ambient temperature of a clock will slow it down from the expansion and lengthening of the pendulum unless the pendulum is a compensating type.
This is probably just because your pendulum is moving too fast or too slow.
The shorteryou make the pendulum the fasterthe grandfather clock.
The pendulum disk is moved up or down by turning the adjustment nut.
If your pendulum clock has lost its best beat you can get it back in time with a bit of beat education and simple tools.
Pendulum bob with rate adjustment french time and strike.
To slow the grandfather clock down move the pendulum disk down by turning the adjustment nut to the left.
Adjusting the pendulum shorter will cause your clock to run faster while lengthening it causes it to run slower or simply put speedup slowdown in the pendulum regulation diagram below look for the rating nut at the base of the pendulum which is what raised or lowers the pendulum disk or bob.
Moving a clock to a higher elevation will slow it down as the air is thinner.
Speed up turn nut left to right slow down turn right to left the longeryou make the pendulum the slowerthe grandfather clock.
The bob will settle lower making the effective length of the pendulum longer.
Adjust the bob at the bottom of the pendulum if the clock is running too fast or slow.
Check your adjusted clock against a reliable timepiece several times over the course of a day and continue making adjustments until your clock reads correctly.
Push the bob up to make the clock run faster and push the bob down to make it slower.
Turning the screw to the left will lower the pendulum slightly and slow down the clock.
