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).
Comparative tests on two oil samples examining viscosity and separation of asphaltic bodies after heating.
| Identifier | ExFiles\Box 32\3\ Scan114 | |
| Date | 25th February 1926 guessed | |
| 2. Comparative tests have also been made by intermittently heating the oils to a temperature of 200°C. for 24 hours in order to ascertain the amount of alteration in the viscosity of the oil and the separation of asphaltic bodies insoluble in very light petroleum (Pentane). 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. Heating test. Oil exposed at temperature of 200°C. for 24 hours.- A.{Mr Adams} B. Efflux Time (Redwood) seconds, at 140°F.{Mr Friese} } 280 307 Increase in viscosity expressed as percentage on unheated oil. } 24 27 Asphaltic bodies insoluble in Pentane. } 0.18% 1.36% 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.{Arthur M. Hanbury - Head Complaints} Adams. SIR HENRY FOWLER, K.B.E. Handwritten: A Oil is Price's Motorine C B " " Wakefield's XL | ||