Eötvös
•Eötvös (1888-1905/08s): @ 1 part in 108 by torsion balance tests.
It
was indeed a very subtle idea that a deviation from the proportionality
between inertial and gravitational mass should show up as a rotation of the balance
Note:
Eötvös was not aware of the work by
Einstein just in the same years….he had
a very sensitive instrument and used
it!!!