81. Tracked Changes. Optics and photonics. Optical materials and components. Test method for refractive index of infrared optical materials. (1st February 2022) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (56 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
82. Tracked Changes. Optics and photonics. Test methods for telescopic systems. Test methods for transmittance Part 5, (9th March 2022) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (50 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
83. Tracked Changes. Plastics. Poly(methyl methacrylate) double- and triple-skin sheets. Test methods. (6th August 2021) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (70 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
84. Tracked Changes. Road vehicles. Safety glazing materials. Method for the determination of solar transmittance. (4th January 2022) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (58 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
85. Ultrasonics. Transducers. Definitions and measurement methods regarding focusing for the transmitted fields. (10th February 2021) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (118 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗