How to Adjust the Pendulum on a Seth Thomas Clock
A pendulum regulates the speed at which a pendulum clock runs. The speed at which a pendulum swings is dependent on the position of a weight in the pendulum and the length of a pendulum shaft. Seth Thomas was an American clockmaker who produced tall, mantle and other types of clocks. You can adjust the pendulum to regulate the speed in a Seth Thomas clock either on the face or using an adjustment knob on the base of the pendulum. Does this Spark an idea?
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Instructions
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On the Dial
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1
Note the time on the clock. Adjust the clock's time to match the time on your watch.
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2
Check the clock time at the same time on your watch one day later. Decide whether the clock is running fast or slow.
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3
Insert a square key into the slot below the center of the dial on the clock face. Turn the key clockwise to slow down the clock; counterclockwise to increase its speed.
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4
Continue to check and adjust the clock for six days.
On the Pendulum
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5
Note the time on the clock. Adjust the clock's time to match the time on your watch.
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6
Check the clock time at the same time on your watch one day later. Decide whether the clock is running fast or slow.
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7
Turn the adjustment nut on the base of the pendulum clockwise to speed up the clock; counterclockwise to slow it down. One complete turn will alter the time in 24 hours by one minute.
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8
Check the clock every day at the same time for six days to see if the clock requires more adjusting.
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