Date: Fri, 05 Mar 1999 10:34:09 -0500

Author: Gerald Zani

Subject: Jumping Rings Sweet Spot



I am making a new Thompson's Coil, PIRA 5K20.30. Instead of dropping the
welding rods all the way to the bottom of the coil, I thought I heard in the
workshop that it is best to drop the core rods approximately an inch up, off
the bottom of the coil to get the max ring jump. Is this true? Is there a
particular depth in the coil for the iron core where the ring really flies

Approximately where is the sweet spot in the Thompson's Coil for the iron
core? My coil is 7.5" high, and the welding rods are 14" long.


Gerald Zani
Lecture Demonstrator
Dept. of Physics #1843
Brown University Phone: (401) 863-3964
Providence, RI 02912 Fax: (401) 863-2024

Demonstrations for duty and humanity. And to make Mother happy.