1. Fire detection and alarm systems for buildings. Specification for optical beam smoke detectors Part 5, (31st March 1988) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (24 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
2. Specification for reference wavelengths for optics and optical instruments. (30th November 1988) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (8 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗