El-11 Franklin's Bell (Lightning Warning Device)
Published: Tuesday 14 March 2006 - Updated: Thursday 31 March 2011
To demonstrate Benjamin Franklin's lightning warning device.
- Van de Graaff generator
- Franklin's bell apparatus (as in diagram)
Click on pictures to enlarge.
The bell apparatus is placed beneath the Van de Graaff dome. Starting the generator simulates a storm passing overhead. The high voltage present rings the bells.