Original "Show boat" visits Capital. The "Show Boat" about which Edna Ferber based her book by that name is one of the few that are still doing business on Eastern rivers. It is now docked on the Potomac river in Washington for an engagement. Miss Ferber spent five weeks on the boat, gathering material for her novel, and its skipper, Capt. Hall, corraborated in the making of the "Show Boat" motion picture. 11/21/30