21. Ophthalmic optics. Contact lenses. Measurement methods Part 3, (30th April 2018) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (48 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
22. Optical fibres. Measurement methods and test procedures. Fibre curl Part 1-34, (26th March 2021) 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) ↗
23. Optics and optical instruments. Contact lenses. Determination of curvature. (15th September 1998) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (22 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
24. Optics and photonics. Test methods for telescopic systems. Test methods for field curvature Part 9, (20th September 2019) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (14 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
25. Photography. Sensitometry of screen/film systems for medical radiography. Determination of sensitometric curve shape, speed and average gradient for mammography Part 3, (15th April 1999) 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) ↗
26. Plastics. Poly(methyl methacrylate) double- and triple-skin sheets. Test methods. (29th July 2021) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (30 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
27. Specification for 35 mm microcopying of technical drawings. Photographic requirements for silver film Part 2, (30th December 1977) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (7 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
28. Specification for asbestos-cement cisterns. (22nd March 1974) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (9 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
29. Specification for clay tiles for flooring. (31st July 1974) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (30 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
30. Specification for glazed ceramic tiles and tile fittings for internal walls. (31st July 1974) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (25 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗