Electrostatics experiments

This tiny instrument is a versorium. Anybody can make it in a few minutes.

The vane cut out an aluminium (aluminum) foil replaces Gilbert's needle.

It can detect charged objects and is so an electroscope.

The spacing of the leaves increases with the quantity of charges.

As it is charged, this spacing changes accordind to the sign of the new charges.

To make the following experiments you must undertake to do it. Is not the fastest to realize but it will astonish you by its high sensitivity.

By comparison you will be able to select straws that electrify at best.