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).
Measurement of condenser capacities by Weston A.C. Milli-ammeter.
| Identifier | ExFiles\Box 34\1\ Scan068 | |
| Date | 30th June 1919 | |
| R.R. 235 a (100 T) (RV. 575. 16-4-19) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2354. X. 2512 30.6.19. X. 2512 X. 2434 X. 3129 MEASUREMENT OF CONDENSER CAPACITIES BY WESTON A.C. MILLI-AMMETER X 2512 (1) R R.12 condenser used for packing up instrument reading. Voltage of 221.5 gives standard packed up reading of .0150 ampere. (susceptance = 67.7 micromhos) p = 2Πf f = 262 K = I / p E = 67.7 / 262 microfarads. = .258 mf. (2) Reading with standard B.T.H. condenser = .0231 milli-amps. Milli-amps for standard condenser = .0231 - .0150 = .0081 Capacity of standard = (.0081 / .0150) x .258 = .0081 x 17.2 = .139 mf. | ||