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).
Table of approximate capacitance values in microfarads for various experimental condensers.
| Identifier | ExFiles\Box 34\1\ Scan019 | |
| Date | 5th July 1918 | |
| X.199. 5-7-18 APPROXIMATE CAPACITIES IN MICROFARADS OF EXPERIMENTAL CONDENSERS 18.6.18 . 5.7.18. M 1. .105 M 2. .140 M 4. .195 .18 E.F.C. .550 W.E. .475 Liberty. .38 R.R. 1. .12 R.R. 2. .07 .065 R.R. 3. .11 .10 R.R. 4. .14 R.R. 5. .18 X.2512. [Faint vertical stamp in center: ROLLS-ROYCE LTD DERBY] | ||