Chart recording from a 'Megger' electrical insulation test.
| Identifier | ExFiles\Box 38\5\ Scan178 | |
| Date | 9th December 1921 guessed | |
| Printed Text: TRADE MARK, 'MEGGER', REGd. Y-Axis Labels: 8, 7, 6, 5, 4, 3, 2, 1 X-Axis Labels: 250, 240, 230, 220, 210, 200 Handwritten Text (written vertically): A {Mr Adams} /F/E / div = .285, Run 38 hours = 51.1, 270. | ||
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).