Tempered glass is stronger and more durable than regular glass sheets and plate glass. It is used in a wide variety of products, including vehicle windows and specialty items like scuba diving ...
Yerkes Observatory is home to more than 175,000 astronomical glass plates, dating from 1897 to the 1990s. Part of the University of Chicago collection, the majority of the plates are in situ at Yerkes ...
Taken at Mount Wilson, 1905. #6 of Plate 51 in E. E. Barnard, A Photographic Atlas of Selected Regions of the Milky Way (1927). The Yerkes Glass Plate Collection consists of more than 175,000 ...