how to build it.. using a d-cell battery, wrap the copper wire 7 times with 3 inches of loose wire...
TRANSCRIPT
Using a D-cell battery, wrap the copper wire 7 times with 3 inches of loose wire at either end
Wrap the end around the coil to tie off
Sand off the insulation all the way around on the left to ¼ inch from the coil
Sand of ½ the insulation around on the right side to within ¼ inch of the coil.
Left – sand all insulation
Right – Sand only ½ insulation from
around