•From the 1950s
through to 1970, Saxl and Allen operated
a large torsion pendulum at Harvard, repeatedly
measuring the period over extended experimental
series taking many days. Not only did they detect periodic deviations similar to those found by Allais, but during the solar eclipse of 1970 they detected a pronounced increase of the period. They also observed a weak spike during a lunar eclipse.
•
•(A torsion pendulum operates independently of Earthfs
gravitation; the effects are
produced only by the torsion of the support wire and the rotational inertia of the bob)