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 schedule report for various experimental coils, detailing electrical and thermal performance.
| Identifier | ExFiles\Box 69\1\ scan0227 | |
| Date | 23th April 1929 | |
| X.8710 X.8710. TESTS OF EXPERIMENTAL COILS TO SCHEDULE. DATED 23.4.29. X.4501. Date. | Coil No. | (1) | (2) Primary Resis.(ohms) Induct.(henries) | Secondary Res. ind.(ohms)(henries) | Temp. °C. | (3) | (4) O.C. Amps. S.C. Amps. | (5) Final Temp. °C Ambt. Temp °C | (6) Final Temp. °C Ambt. Temp. °C | (7) Speed limits r.p.m. | (9) Speed limit 10 V.{VIENNA} 8 V.{VIENNA} | Remarks 24.7.28 | IS | OK | 2.05 .0067 | 3732 29.2 | 22 | OK | 1.05 1.16 | 73 25 | 100 28 | - | - - | Outside primary coil broke down after (6) 24.7.28 | PWP2 | OK | 2.25 .0157 | 4860 43.2 | 15 | OK | .780 1.06 | 79 20 | 75 20 | None | - - | PWP. Coil. 29.9.28 | PWF1 | OK | 2.25 .0157 | 4892 43.2 | 20 | OK | .860 1.08 | 38 18 | 70 19 | None | - Mis-fires | PWP. coil filled with paraffin wax. 29.9.28 | WF1 | OK | 2.20 .0149 | 4988 43.7 | 16 | OK | .850 1.07 | 37 11 | 62 22 | None | 900 Mis-fires | Wax filled coil 24.7.28 | DX. 45X | OK | .96 .0098 | 4530 40.8 | 25 | OK | 1.16 1.34 | 42 22 | 62 27 | None | 1220 Mis-fires | Standard coil. 30.10.28 | PWP5 | OK | .89 .0099 | 4490 38.8 | 14 | OK | 1.22 1.30 | 40 18 | 49 20 | None | 1300 Mis-fires | PWP. Coil. 19.2.29 | LS1 | OK | .88 .0099 | 4707 45.3 | 15 | OK | 1.08 1.22 | 43 16.5 | 57 16.5 | None | - - | 20,000 turn coil run with 14 bel as 1.5.29. | LS2 | OK | .94 .0093 | 5070 44.3 | 15 | OK | 1.07 1.22 | 49 16 | 70 17 | None | 1890 1130 | " 23.9.29 | LC3 | OK | .65 .0071 | 4870 43.6 | 19 | OK | 1.17 1.26 | 40 18 | 56 19.5 | Coil Failed | - - | } Short circuit on secondary winding 10.10.29 | LC2 | OK | .64 .0071 | 4802 43.7 | 18 | OK | 1.18 1.28 | 37 17 | 56 19 | Coil Failed | - - | } 9.10.28. | ||