Vault Lights | Applications of These Illuminating Pieces
The Digital Research Library of Illinois History Journal™ : The History of 19th & 20th Century Vault Lights (prism glass used in sidewalks) used in Illinois Towns and Cities.
Veralux, vault light with prismatic glasses (ca. 7 x 7 cm) in an iron... | Download Scientific Diagram
81R™ Glass Bullets & Cast Iron Vault Lights | Circle Redmont
Pavement light - Wikipedia
Brooklyn Vault Light Company | glassian
19th century cast iron sidewalk and stoop vault lights have all but vanished in chicago | Urban Remains Chicago News and Events