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
Mason S. Stone Mason S. Stone Mason Sereno Stone (December 14, 1859 – July 13, 1940) was a Vermont educator who served as state Superintendent of Education. From 1919 to 1921 he was Lieutenant Governor of Vermont. Mason Sereno Stone was born in Waterbury Center, Vermont on December 14, 1859. He worked as a teacher, principal and school superintendent, and received a bachelor's degree in 1883 and a master's degree in 1909, both from the University of Vermont. He served as Vermont's Superintendent of Education from 1892 to 1900. He also served as a member of the Norwich University Board of Visitors, and