By Rabbi Yair Hoffman Introduction and Foundation The evolution of timekeeping devices has presented numerous challenges and considerations within Halacha, with each technological advancement bringing new questions to consider. Much of the following analysis is based upon information in a new article in the Ohalei Shabbos Gilyon 77-78 by Rabbi Yitzchok Rubin shlita and Rabbi Shalom Gelbar shlita. (My thanks to my brother-in-law, Rabbi Avrohom Hirsch, a prominent sofer in Yerushalayim who forwarded it to me). Early Mechanical Watches In the early 16th century, the development of mechanical watches revolutionized personal timekeeping through an intricate system of springs, gears, and the balance wheel.
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