 In the early 1960s, Saxl began a collaboration with Mildred Allen of Mount Holyoke College.In 1971, Saxl and Allen published a report of anomalous changes in the period of a torsion pendulum during a solar eclipse in 1970 and hypothesized that “gravitational theory needs to be modified”.In addition, they observed unexplained diurnal variation in the period of the pendulum.