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).
1½ m.m. gap for 20 HP radiator tubes and requesting two test sets, especially for the 'Japan' engine.
| Identifier | ExFiles\Box 105\1\ scan0058 | |
| Date | 18th February 1930 | |
| BY.{R.W. Bailey - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} +5250 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}1/MJ.18.2.30. 20 HP. RADIATORS. We think that to be consistent we ought to have 1½ m.m. gap between the tubes of the 20 HP. radiator. We certainly should not like to go to the aluminium head 'Japan' engine without taking this precaution. We should therefore be obliged if you could instruct two sets of tubes for the latest type of 20 HP. radiator in order that we may test them out. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||