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).
Circuit diagram for high tension direct current (HTDC) insulation tests using a trembler coil and rectifying valve.
| Identifier | ExFiles\Box 24\2\ Scan275 | |
| Date | 29th April 1927 | |
| INTERMITTENT POSITIVE H.T. MAIN., DIAGRAM OF CONNECTIONS, FOR, H.T.D.C. TESTS OF INSULATION, WITH, TREMBLER COIL & H.T. RECTIFYING VALVE, R.R. TREMBLER COIL., H.T. +, C, E, H.T. RECTIFYING UNIT, H.T. ~, +, B-, D, F-, H.T.D.C. MAIN, BATTERY, SWITCH, H.T. CONDENSER, (.3 MICROFARAD), WITH SAFETY GAP, CALIBRATED, H.T., SPARK GAP., MILLIAMMETER, WITH SHUNTED, CONDENSER., M.A., INSULATION, UNDER TEST, (DIAGRAMMATIC), DATUM CONDUCTOR., EARTH, E.F.C. | ||