What are the circumstances needed to consider one's actions "מדידה של מצוה" (measuring for a mitzvah).
Summing Up the Three Categories of Using a Tree;
Is One Allowed to Press the Button on a Fan to Control the Oscillating (Turning Back and Forth) Cycle on Shabbos? Using Water Vaporizers...
understanding the Concept of מבטל כלי מהיכנו (Nullifying a Vessel from Its Usage);