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).
Report page comparing the heat test results of two oil samples, 'A' (Prices Motorine 'C') and 'B' (Wakefields 'XL').
| Identifier | ExFiles\Box 144\1\ scan0137 | |
| Date | 10th March 1926 guessed | |
| contd :- -2- There was not much difference in the behaviour of the oils as to thickening, i.e. increase of viscosity compared with the original oil, but the amount of asphaltic bodies produced in sample 'B' was considerably greater than from 'A', the ratio being about 7:1 Heat test. Oil exposed at temp. of 200°C for 24 hrs :- 'A' 'B' Efflux time (Redwood) } 280 307 seconds, at 140°F } Increase in viscosity } expressed as percentage} 24 27 on unheated oil. } Asphaltic bodies insol-} 0.18% 1.36% uable in Pentane. } From this test and from the general consideration of the figures obtained in the examination one might safely predict that sample 'A' would prove more satisfactory in practice than sample 'B'. Signed - T.H. Adams. Sir Henry Fowler K.B.E. --------------------- 'A' OIL IS PRICES MOTORINE 'C'. 'B' OIL IS WAKEFIELDS 'XL'. | ||