Translation:Mishnah/Seder Moed/Tractate Eruvin/Chapter 1/9

Introduction
This mishnah continues the discussion of the previous case where a travelling caravan had camped in a remote area for shabbat. It discusses another method of that caravan creating an eruv with a minimum of equipment.

Hebrew Text

 * מקיפין שלושה חבלים, זה למעלה מזה זה למעלה מזה--ובלבד שלא יהא בין חבל לחברו שלושה טפחים;
 * שיעור חבלים--עוביין יתר על טפח, כדי שיהא הכול עשרה טפחים.

Explanation
The talmudic principle of lavud states that any gap of 3 tefachim or less is not considered a gap at all. This mishnah uses this principle to allow someone to build an eruv (for which the borders must be 10 tefachim high), with just three ropes which are seperated by 3 tefachim or less. To make the ten tefach total, the ropes themselves must have a total thickness of a tefach.