WADSWORTH JARRELL’s 1973 “Untitled (African Rhythm, Our Heritage)” achieved an artist’s record at Swann’s Oct. 6 sale of African American art.   WHEN THE HAMMER CAME DOWN, a brief round of applause followed the sale of Wadsworth Jarrell‘s “Untitled (African Rhythm, Our Heritage).” The vibrant mixed-media painting sold for $78,000 ($97,500 including fees), more than...