A comprehensive and lucid review of the laws of constructing and using an eruv, especially applicable to today's urban neighborhoods. Compiled from many Talmudic and Rabbinic sources and presented in a clear, annotated, and illustrated format, this important work will benefit every Jew.

This third edition contains a new 35 page appendix (including 14 new illustrations) on "Practical Issues in the Field". In addition, it includes a new, expanded forward, a new discussion that emerged from correspondence after the publication of the second edition, and an expanded list of references to sugyos in Masechtos Shabbos and Eruvin.