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 for standard ignition coils, detailing performance metrics against a specification.
| Identifier | ExFiles\Box 69\1\ scan0104 | |
| Date | 12th June 1928 | |
| X 8710 X.8781 cl. STANDARD IGNITION COILS D.70346. X.8710. X.5781 cl. [strikethrough] X.5710. [strikethrough] (22 S.W.G. primary 18,000 turn secondary). Table of Test Results: | Date. | Coil No. | Secondary continuity. | Secondary milliamps. | O.C.S. test. | Running current (amps). | Remarks. | |---|---|---|---|---|---|---| | | | | < 16.5 | >1.18 | .93 to 1.00 | | | 8.6.28 | Q2M | O.K. | 15.9 | 1.09 | .94 | These six coils are those whose results form the basis for the production specification issued 9.6.28. | | " | Q3M | O.K. | 15.9 | 1.13 | .97 | | | " | Q4M | O.K. | 15.8 | 1.12 | .96 | | | " | ZE35 | O.K. | 15.6 | 1.12 | .96 | | | " | ZE45 | O.K. | 15.1 | 1.09 | .94 | | | " | BC45X | O.K. | 15.8 | 1.10 | .94 | | 12.6.28. | ||