Abstract: A socket set in which all of the sockets of decreasing order can interfit into each other and for connecting to the drive for transporting from one place to another. Each of the sockets may be interchanged in position so that the sockets may be engaged with each other and used as an extension for any other socket size.

Abstract: A process for forming a glazed ceramic substrate, more particularly for forming a particular surface finish and/or surface pattern in the glass. The process consists of preparing a ceramic mixture which includes a basic oxide, such as Al.sub.2 O.sub.3, and a glass, forming the substrate as by molding, pressing, or doctor blading and lamination, and sintering in a non-reactive atmosphere on a setter tile that is non-wettable by the glass. During the sintering operation the glass becomes molten and flows downwardly under the influence of gravity through the ceramic particles. The glass flows to the setter plate to conform to its surface configuration, forming a glazed surface on the substrate.

Abstract: A method of forming ceramic material which includes mullite (3Al.sub.2 O.sub.3.2SiO.sub.2) in any desired percentage. A particulate mixture is formed of (1) mullite in an amount of at least 5% by weight, (2) Al.sub.2 O.sub.3 in an amount to provide sufficient SiO.sub.2 to combine with Al.sub.2 O.sub.3 to form the desired mullite. The mixture is sintered to a temperature in the range of 1300.degree. C. to 1600.degree. C. wherein the Al.sub.2 O.sub.3 and SiO.sub.2 react to form mullite under the influence of the initially added mullite.