[Avodah] Chess Clock

[Esther and Aryeh Frimer]

Has anyone heard whether there is a problem with using a windup-spring operated chess clock on Shabbos and Yom Tov? 
In case you don't know, a chess clock is two timers in one case that are used to limit the time available for each player's moves. The case has a button atop each timer. When a player finishes his move, he presses his button; his timer stops and the other player's timer starts. Here is a picture: 
http://www.ibknight.com/images/ChessClocks/CGLClockBlue1.JPG

Aryeh Frimer

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Dr. Aryeh A. Frimer
Chemistry Dept., Bar-Ilan University
Ramat Gan 52900, ISRAEL
E-mail: FrimeA at mail.biu.ac.il



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