MARCH, 1906) PUBLIC MAY USE TANK CAR IMPROVEMENTS The Official Gazette of the United States patent office contains a notice of the dedication by the Pennsylvania Railroad to public use of the invention covered by a patent issued to W.F. Kiesel, Jr., in 1905 for an improvement in tank cars. The instrument of dedication grants to the public the right to make, use, and sell the invention without liability to the Pennsylvania Railroad, nothing, however, in the document to be construed as an acknowledgment by the