How to Adjust an Ingraham Mantle Clock

Open the clock face cover on the right side of the clock by pressing the clasp inward. Swing the cover to the left to access the clock face and pendulum. Some models of Ingraham clocks do not have glass face covers, though most do.

Insert the small end of the Ingraham clock-winding key into the adjustment hole on the face of the clock. This hole will be smaller than the winding hole on the face of the clock and is near the number eight on the clock.

Turn the winding key counterclockwise a quarter turn to increase the clock speed. This will prevent the clock from losing time after winding so that it will hold the time accurately.

Turn the small end of the winding key clockwise a quarter turn to decrease the clock speed. This action will slow a clock speed if it gains time after winding so that it will display accurate time.

Turn the pendulum-retaining nut to make major adjustments in the time on an Ingraham mantle clock. The pendulum- retaining nut is on the very bottom center of the pendulum.

Grasp the nut between a thumb and forefinger and turn it one quarter turn counterclockwise to slow the clock speed or clockwise to increase the clock speed. This method will adjust Ingraham mantle clocks that vary from the actual time by one half hour or more per day.

Close the glass face cover on the clock by swinging the door closed until an audible click sounds at the door latch.