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).
Blueprint showing a diagram of a slotted pipe assembly.
| Identifier | WestWitteringFiles\Q\February1927-March1927\ 38 | |
| Date | 17th February 1927 guessed | |
| Slot 7.000" x .425" Fig. 1. (Slotted Pipe.) | ||