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).
Instructions detailing a scheme for testing the breakdown voltage of various insulation materials.
| Identifier | ExFiles\Box 24\2\ Scan044 | |
| Date | 29th January 1920 | |
| RR 300 (120B) (SF 349 24-1-19) MP 200552 X. 1109. 88220 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: EFE Order No: Customer's No.: 1 Re: X 1109 29 - I - 1920 Insulation. Scheme of Testing. Two forms of Insulation have to be tested, I Sheet, II Block. I) Sheet includes, Paper, fabrics (treated or untreated) mica and micanite, varnishes & asbestos. A general test can be specified for these, viz:- Breakdown voltage. Place a sample between plane electrodes, connected to testing transformer, and gradually raise voltage until breakdown. Note this pressure. Observe thickness of sample with micrometer and tabulate "Breakdown volts per mil." (cont'd) Signed This Sheet must be filed on completion of the work. | ||