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).
Chemical analysis of deposit from a crank web and crank journal.
| Identifier | ExFiles\Box 145\2\ scan0003 | |
| Date | 19th January 1932 guessed | |
| 2. Some deposit was taken from the crank web and also from the crank journal. The results of our examination are as under :- Crank Web. Crank Journal. Free Oil 54.00 46.01 Matter insol. in benzene 35.64 26.64 " soluble in " 5.85 4.72 Mineral Matter 4.51 22.63 100.00 100.00 Mineral Matter contains :- Web. Journal. Silica and insoluble 8.50 15.15 Copper Oxide 4.54 Iron " 84.02 55.77 Lime 2.25 If we calculate both these results on an oil-free basis they are as under :- Web. Journal Benzene soluble 12.72 8.74 " insol. 77.48 49.34 Mineral Matter 9.80 41.92 This method throws into relief the large proportion of mineral matter in the journal. This of course, is what one would expect because the heavier particles which are mineral are thrown out by centrifugal force, consequently would remain in the journal. If now we calculate on an oil-free and ash-free basis, we see the similarity between the composition of the organic portion :- Web. Journal Benzene soluble 14.09 15.05 " insol. 85.91 84.95 | ||