Looking for reference information, or better still, the image itself,
of the old steel engraving showing an early attempt to simulate
lightning with a row of insulated, nearly-touching, iron cannonballs
mounted atop wineglasses.  When high voltage from an electrostatic
generator was connected across the thing, a spark would jump from one
cannonball to the next along the row, thus completing the circuit, and
thereby (somewhat feebly) simulate lightning.  I have tried searching
with words like "cannonballs," "lightning," "wineglasses," "goblets,"
"simulator," "spark," "electrostatic," etc. but didn't turn up
anything.  You might look in works of the late A.D. Moore , other
historians of electrostatics or electricity.  It's not in Schonland,
"The Flight of Thunderbolts" where I thought it would be.