THIS MONUMENT HAS BEEN
ERECTED BY THE
GRAVITY RESEARCH FOUNDATION
ROBERT W. BABSON FOUNDER
IT IS TO REMIND STUDENTS
OF THE BLESSINGS FORTHCOMING
WHEN A SEMI-INSULATOR IS
DISCOVERED IN ORDER TO HARNESS
GRAVITY AS A FREE POWER
AND REDUCE AIRPLANE ACCIDENTS
1961
An article on this plaque.
Courtesy @npseaver