School Stumbles Upon Chalkboards From 1917 During Renovation, Perfectly Preserved Lessons Provide Rare Look Into Past. Posted on July 14, 2019 by Erik Chipchase School Stumbles Upon Chalkboards From 1917 During Renovation, Perfectly Preserved Lessons Provide Rare Look Into Past. Very cool!We found a chalkboard that a student practiced their math lesson behind a wall from 1910.