The Turn Of The Century Electrotherapy Museum http://www.electrotherapymuseum.com Baby Bipolar Tesla Pancake Coils - 4.5" OD 6"+ Spark Capacity These coils will be placed in a case 6" deep x 12" long x 5.5" high and filled with wax. 1000 turns of wire in each secondary coil, 5 turns in each primary coil. Actual coil size is 4.5" OD x 4" tall with paraffin wax + oil insulation Two coils are of the type constructed here:   The construction of a small 4" Pancake Coil