Glass Opaque to Slanting Rays Guards Against Air Raids
Item
Peculiar properties of specially treated flat glass make it transparent to light rays and vision at an angle of 90 degrees, but looked at from above at a 45-degree angle, it becomes opaque. Used as window glass, it is in keeping with the present air-raid precautions campaign. To an observer on the ground, or on the same level as the window, the glass is clear. However, to the warbirds overhead, a factory’s windows would give no visible light to mark it as a target.
- Title (Dublin Core)
- Glass Opaque to Slanting Rays Guards Against Air Raids
- Article Title and/or Image Caption (Dublin Core)
- Glass Opaque to Slanting Rays Guards Against Air Raids
- Language (Dublin Core)
- Eng
- Temporal Coverage (Dublin Core)
- World War II
- Date Issued (Dublin Core)
- 1942-05
- Is Part Of (Dublin Core)
-
Popular Mechanics, vol. 77, n. 5, 1942
- pages (Bibliographic Ontology)
- 70
- Rights (Dublin Core)
- Public domain
- Source (Dublin Core)
- Google books
- Archived by (Dublin Core)
- Enrico Saonara
