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).
Page 2 of a memo regarding the 20 HP radiator pipe design, correct water levels, and overflow pipe modifications.
| Identifier | WestWitteringFiles\T\2January1929-June1929\ Scan183 | |
| Date | 14th April 1920 guessed | |
| contd :- -2- to the 20 HP. radiator. viz: in two parts. One part soldered into the top tank, the second bolted to a boss on the rear outside of the top tank and clipped to the radiator side plates. The advantages of making the pipe in two sections are : (1) The pipe inside the radiator can be fitted before the top tank is finally sealed up, ensuring that the shape of the pipe is correct relative to the 'inflow' pipe. (2) The outside part of the pipe med not be fitted until a last operation before the chassis leaves the Erecting Shop, obviating damage done to it whilst erecting the radiator on the chassis etc. - this latter is a very common occurrence at present. Water level in radiator. The correct water level in the radiator should be as shewn by the line A-B, 3" below the top of the filler or half way up the inflow pipe with the water temperature at 80°C. or 4.4" from the top when cold. If filled to A-B when cold, water is lost due to the expansion when heating up to 80°C. Hs{Lord Ernest Hives - Chair}/A.J.Lidsey. We recommend the overflow pipes should be modified on all S.S. radiators. Hs.{Lord Ernest Hives - Chair} | ||