
Installation of 65 Shure Unidyne III Microphones in the Illinois Constitutional Convention meeting room in 1970 (shown above). The convention was held in Springfield, Illinois, the state capital, to draft the first new state constitution since 1870. The new constitution was passed by the convention delegates on September 3, 1970, and ratified in a special election by the citizens of Illinois on December 15, 1970. The state’s first constitution had been ratified in 1818.


