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).
Directive on the new type of louvre for 20 HP and 40/50 HP bonnets.
| Identifier | ExFiles\Box 66\3\ scan0127 | |
| Date | 8th March 1926 | |
| L8260 11-0 8/3/26 BY/SS.{S. Smith} c. Hs.{Lord Ernest Hives - Chair} BY3/H.{Arthur M. Hanbury - Head Complaints} 8.3.26. 20 HP. & 40/50 HP. BONNET LOUVRES. Whenever we are using louvred bonnets either of the 40/50 or 20 HP. type, we should make them with the new type louvre which is bent inwards and outwards. BY.{R.W. Bailey - Chief Engineer} [Signature] | ||