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).
Calculation sheet for the electrical characteristics of a condenser and transformer system.
| Identifier | ExFiles\Box 52\3\ Scan365 | |
| Date | 14th February 1924 guessed | |
| -4- CONDENSER. Capacity (microfarads) K 900-.465 PRIMARY & CONDENSER. Period of oscillatory current (secs) T = 2π√LK {L. King} .000234 Radio wave length (metres) VT 70200 PRIMARY, CONDENSER & BALLAST Decrement of oscillatory current πR√(K {Mr Kilner} /L) .0361 Damping factor. .9645 Ratio working time constant / period t₁/T 13.9 Maximum voltage c'√(L/K) 355 SECONDARY. Number of turns. n 25870 Dia. of wire (inches) .005 Approx. resistance (ohms) R' 4100 " inductance (henries) L' 62.0 " time constant (sec) L'/R' .01513 Maximum voltage MC'/√LK {L. King} 48400 PRIMARY & SECONDARY. Step up ratio n'/n 143.7 Coefficient of coupling assumed η' .949 (η = η'² = ) Mutual inductance. M = η'√(LL') .409 LL' - M² .0186. Contd. | ||