1860 Aug. 299 The paint of a school blackboard will endure much longer if covered with a coat of copal-varnish.
1938 1 293/1 That familiar and somewhat formidable landmark in everybody's education—the school blackboard.
2011 (Nexis) 24 May (Extra section) 20 ‘Out of this wood do not desire to go,’ writes one young boy on the school blackboard.