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).
Table of temperature readings in degrees Celsius taken at various points on a Phantom III cylinder head under different test conditions.
| Identifier | ExFiles\Box 93\4\ scan0042 | |
| Date | 27th June 1936 guessed | |
| (B) Temperatures in °C. at various points in Ph.III Cylinder Heads. Note: All Nos. of Thermometers & Thermo-Couples refer to diagram (1) - 'B' series of tests. Points at which Temperatures were recorded Condition of Test | Thermo-Couple Numbers | Thermometers | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | A | B | C (1) Head as standard. Full Throttle, 2500 R.P.M. | 73 | 88 | 94 | 83 | 88 | 106 | 92 | 83 | 77 | 92 | 105 | 85 | 93 | 83 | 80 (2) As diagram (2), 'B' series of tests Full Throttle - 2500 R.P.M. | 80 | 86 | 92 | 94 | 114 | 112 | 106 | 94 | 88 | 94 | 81 | 85 | 83 | 80 (3) As diagram (3), 'B' series of tests Full Throttle - (a) 2500 R.P.M. | 77 | 79 | 99 | 71 | 81 | 90 | 84 | 79 | 74 | 93 | 93 | 77 | 80 | 78 | 77 (b) 750 R.P.M. | 72 | 73 | 100 | 71 | 77 | 90 | 82 | 77 | 70 | 94 | 92 | 76 | 80 | 77 | 77 (4) As diagram (4), 'B' series of tests Full Throttle - (a) 2500 R.P.M. | 78 | 103 | 90 | 72 | 78 | 82 | 97 | 80 | 72 | 93 | 79 | 74 | 90 | 82 | 79 (b) 750 R.P.M. (5) Head used in No.4 above but with water holes as std. (a) 2500 R.P.M. | | | | | | | | | | | | | 95 | 72 | 71 | ||