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).
List of specifications and calculated values for a contact breaker, primary circuit, and core.
| Identifier | ExFiles\Box 69\1\ scan0003 | |
| Date | 14th February 1924 guessed | |
| -3- CONTACT BREAKER. Normal speed (R.P.M.) 700 No. of breaks per revolution. 6 No. of breaks per second. 70 Platinum gaps set at - .020" Make ratio. r .50 Period (sec.) T' .0143 Time of make (sec.) t¹ .00714 Time of break (sec.) t" .00714 Time constant ratio. S = t¹/T¹ .2653 CONTACT BREAKER & PRIMARY. Ratio time of make / time constant. t¹/T₁ 1.882 Energy delivered by battery per period (joules). W .0995 Calculated current at break. (amperes) c¹ 2.68 Ratio current at break / final current. x = c¹/c₀ .848 CONTACT BREAK & CORE. Approx. flux at break. 10⁸ Lc¹/n 8573 CONTACT BREAKER PRIMARY & CORE. Approx. flux interlinkages at break. 10⁸ Lc¹ 2572x10³ Energy of magnetic field at break (joules) W¹ = ½ Lc¹² .0345 Approx. efficiency of magnetic field production. η .347 | ||