Chalk talks

Lectures or speeches supplemented by drawings or other visual aids, Thomas Beard (1842-1905) is credited as being the originator, and was for many years a lecturer at Chautauqua in upstate New York. He used chalk and blackboards to illustrate his presentations. The term has taken on the broad meaning of that which is supplemented with visual materials. Among American chalk-talk artists are Signe Larson, Joseph Willis, Frances Karlsson and Charles Morgan. Source: Peter Falk, "Who Was Who in American Art"; AskART Database