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).
Specifications for a transformer used for insulation testing to observe the breakdown voltage of samples.
| Identifier | ExFiles\Box 24\2\ Scan062 | |
| Date | 17th November 1920 | |
| X.1109 17.11.20. X.1109 - TRANSFORMER FOR INSULATION TESTING. X.1581. To be used for observing "Breakdown-voltage" of samples. Each test would last for a few minutes only. The area of samples under test would be a few square inches at most. Damp samples allowing considerable leakage current will be tested. Note frequency now 50~~. F.J.A. | ||