From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Specifications for three pieces of glass, including one with a technical drawing.
| Identifier | ExFiles\Box 23\3\ Scan149 | |
| Date | 19th December 1930 guessed | |
| Drawing dimensions: 1/8" 1" 12 7/8 4-9 7/8" 12 7/8 One piece as above, all corners 90°. 1/4" thick glass edges as cut i.e. not polished. One piece 27" x 19 1/4" x 3/16". The two short edges radiused and polished the other two as cut. All corners 90°. One piece 26 1/8" x 19 1/4" x 3/16". One short edge radiused and polished the other three as cut. All corners 90°. | ||