Well, if you have ever observed how the second hand of a mechanical watch moves, you know that it appears to run smoothly (in stark contrast to the second hand of a quartz watch, which makes a little jump once a second).

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The second explains how to do what Daniels did: make a watch by hand entirely alone.

WSJ: Watch Making's Self-Taught Genius | Michael Clerizo on George Daniels

For his tourbillon, the watch that put Journe on the map, Journe added so-called deadbeat seconds: The second hand doesn't glide but hops from one second to the next.

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