Runs slow
You can speed up or slow down the clock by adjusting the length of the pendulum. This link will walk you through the process.
http://usedclockparts.com/9-clock-case-repairs/31-how-to-speed-up-or-slow-down-your-clock-using-it-s-pendulum
If Hand Wind---Ajust screw device on swing arm clockwise
Place your Seth Thomas atomic clock face-down on a table or desk and locate a series of buttons labeled "PST," "MST," "CST" and "EST" on the back of the clock. Press the appropriate button to set the time zone.
Turn your attention to the small lithium battery-powered digital clock display on the back of your clock. With the correct time zone set, the digital display should accurately reflect the current local time.
Locate the AA battery compartment on the back of your clock. Put two new AA batteries into your clock's battery compartment.
Set the "Mode" switch on the back of your Seth Thomas atomic clock to "Run." Wait for it to adjust to the correct time. The automatic time-adjustment process can take up to 45 minutes, but is usually completed much sooner.
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