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).
Chart showing the relation between pressure differential across an element, liquid velocity, and temperature for various fluids.
| Identifier | ExFiles\Box 149a\2\ scan0305 | |
| Date | 1st November 1930 guessed | |
| CHART No. L/421F CHART SHOWING THE RELATION BETWEEN PRESSURE DIFF. ACROSS ELEMENT AND LIQUID VELOCITY AND TEMPERATURE LENGTH OF TUBES 13" 5/16" O.D. 24 GAUGE 15 TUBES PRESSURE DIFF. ACROSS ELEMENT. INS. WATER. FLUID VELOCITY FT./SECOND OIL (185°F) ETHYLENE (190°F) GLYCOL WATER 175°F | ||