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 results for leakage in coil cases at various temperatures, with notes on developing a production test.
| Identifier | ExFiles\Box 45\4\ Scan305 | |
| Date | 29th June 1920 | |
| RR 330 (100 BKS.) (SHS T. 29-6-20.) MP 224388 ROLLS-ROYCE LTD. INSTRUCTIONS. To _________ Order No. _________ Customer's-No. 4. Table of leakage measurements: Vertical Axis: Leakage (ma) at 2420 @ RMS Horizontal Axis: Temp. °C. Coil case | 20 | 40 | 60 | 80 | 100 ------------------------------------------------- Exptl. | .015 | .15 | .30 | 1.0 | 2.6 1 | .02 | .07 | .16 | .55 | 1.6 2 | .01 | .07 | .35 | 1.0 | 3.0 3 | .015 | .04 | .15 | .55 | 2.0 4 | 0 | .035 | .175 | .77 | 2.2 5 | 0 | 0 | .125 | .75 | 2.0 6 | .007 | .035 | .14 | .5 | 1.2 Stable | 0 | 0 | 0 | .007 | .01 It was intended to develop a test which might be used in production to ensure that all cases put on cars were of sufficiently good non-leaking quality. Owing to the difficulty of using tin-foil, some sheet metal cylinders were made, one to grip on (Cont'd) Signed _________ This Sheet must be filed on completion of the work. | ||