Weck jar secured by steel tension clips which can be removed once a vacuum seal has formed. During storage the vertical position of the rubber seal's external tongue indicates the status of the sealing. Weck products are still produced and are available from German hardware and online stores. Used equipment is frequently sold on online auction sites and in opportunity shops. Weck jar A Weck jar is a molded glass jar used in canning to preserve food. It is popularly used for jam preservation, for its minimal look and foolproof rubber gasket with a glass lid. Weck jars were created by the
John S. Mason John S. Mason John Sanford Mason (August 21, 1824 – November 29, 1897) was a career officer in the United States Army who served as a general in the Union Army during the American Civil War. John S. Mason was born in Steubenville, Ohio, in the late summer of 1824. His father was a prominent physician who had been a military surgeon during the War of 1812. He was educated in the local schools began his college studies at Kenyon College in Gambier. In the winter of 1842, he transferred to Washington College in Pennsylvania. However, he withdrew when he