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).
Test report detailing observations on brush wear for I and K type dynamos.
| Identifier | ExFiles\Box 60\1\ Scan029 | |
| Date | 24th October 1927 | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 461-B-12 24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. To EFC. Order No. P.D.9. Customer's No. X 8673 Miscellaneous Tests of Narrow Brushes. It is thought worthwhile recording the results of some observations made (incidentally, perhaps, but none the less accurately) on some standard grade narrow brushes, run under normal conditions on the cars. The brushes, comprising two sets fitted to I and K dynamos respectively, were examined and measured before the machines were put on the cars. Changes on the cars brought the observations to an end, when the brushes were again measured. The results are given below. | Dynamo | Miles Travelled | Position | Brush Wear | | | |---|---|---|---|---|---| | | | | Positive | Negative | Control | | I. | 8,300 | Inner. | .0015" | .001" | .007" | | | | Outer. | .001" | .002" | .012" | | K.{Mr Kilner} | 6,973 | Inner. | .002" | .0015" | .009" | | | | Outer. | .0025" | .0015" | .0115" | Cont'd.{John DeLooze - Company Secretary} Signed This Sheet must be filed on completion of the work. | ||