The chimes were rung regularly by the university organist, Samuel H. Smith, until 1946 when this duty was assumed by a student, Elliot H. Kone '49.
In 1966, the instrument was expanded by the installation of an additional 44 bells, made possible by a gift from Florence S. Marcy Crofut and also cast by the John Taylor Bellfounders.
Before the additional bells arrived, a practice carillon was installed in the tower to allow Guild members to learn the new instrument ahead of time.
However, the Washington Monument has been the tallest free-standing stone structure in the United States since it was completed, long before Harkness Tower was built.
These students undergo an intensive five-week training program led by experienced members of the guild concluding with an audition.