After they self-evaluate they will be able to set goals that they feel they can attain with the new knowledge they have about themselves. Teachers should encourage self-evaluation because self-assessment makes the students active participants in their education (Sloan, 1996).
Depression Era Glass by Duncan by Leslie Pina The Duncan & Miller Glass Company, of Washington, Pennsylvania, was one of the glassmaking giants of the 1920s -1940s. This book focuses on the company's prolific Depression Era production and includes a valuable prologue about the Victorian wares and an epilogue about their contribution to the Tiffin Glass Co.
A watchglass can be used as a beaker cover, but you can also place small amounts of chemicals on it and then heat it (for example, to evaporate some water from a wet chemical). From Wikipedia: A watch glass is a circular, slightly concave piece of glass used in chemistry as a surface to evaporate a liquid, or as a cover for a beaker. The latter use is generally applied to prevent dust or other particles entering the beaker; the watch glass does not completely seal the beaker, and so gas exchanges still occur.