Seaman Knapp believe demonstration was the best way to convince farmers to try a new course of action. Seaman Knapp believe demonstration was the best way to convince farmers to try a new course of action. By Heidi Marttila-Losure August 7, 2012 Seaman Knapp believe demonstration was the best way to convince farmers to try a new course of action. 2012-08-07 Heidi Marttila-Losure Share ! tweet