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).
Data table detailing the configurations and output voltages for a testing transformer.
| Identifier | ExFiles\Box 32\4\ Scan052 | |
| Date | 25th September 1924 | |
| X 1581 25.9.24. RE TESTING TRANSFORMER. Condition. Position of tappings. Total No. Equivalent (expressed in Nos. of turns). of turns. nominal voltage. 1. 1. 1 .8 2. 2 2 1.6 3. 1,2. 3 2.4 4. 2,1,2. 5 4 5. 2,5. 7 5.6 6. 1,2,5. 8 6.4 7. 2,1,2,5. 10 8 8. 5,10. 15 12 9. 2,5,10. 17 13.6 10. 1,2,5,10. 18 14.4 11. 2,1,2,5,10. 20 16 12. 10,20. 30 24 13. 5,10,20. 35 28 14. 2,5,10,20. 37 29.6 15. 1,2,5,10,20. 38 30.4 16. 2,1,2,5,10,20. 40 32 17. 40,5. 45 36 18. 40,5,10. 55 44 19. 20,40. 60 48 20. 20,40.5. 65 52 21. 10,20,40. 70 56 22. 5,10,20,40. 75 60 23. 2,5,10,20,40. 77 61.6 24. 1,2,5,10,20,40. 78 62.4 25. 2,1,2,5,10,20,40. 80 64 26. 2,5,10,20,40,5. 82 65.6 27. 1,2,5,10,20,40,5. 83 66.4 28. 10,20,40,5,10. 85 68 29. 10,80. 90 72 30. 2,5,10,20,40,5,10. 92 73.6 31. 1,2,5,10,20,40,5,10. 93 74.4 32. 5,10,80. 95 76 | ||