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, dimensions, and weights of various plates.
| Identifier | ExFiles\Box 12\5\ 05-page180 | |
| Date | 6th February 1930 guessed | |
| 39 PORTER 5-Plate 1.76 Thicknes .36 Main Plate .35 Other three 35" 9 15 3/4 wt 36 lbs 1.99 6 Plates .34 Main .33 37 1/4 lbs 29 1/8 .14. ROLLS-ROYCE | ||