Technical data sheet detailing the performance characteristics of a contact breaker and its associated components.
| Identifier | ExFiles\Box 52\3\ Scan364 | |
| Date | 14th February 1924 guessed | |
| -3- CONTACT BREAKER. Normal speed (R.P.M.) 900 No. of breaks per revolution. 12 " " " second. 180 Platinum gaps set at - .020 Make ratio. r .670 Period (sec.) T' .00556 Time of make (sec.) t' .00372 Time of break (sec.) t" .00184 Time constant ratio. s = t'/T¹ .585 CONTACT BREAKER & PRIMARY. Ratio time of make / time constant. t¹/t₁ 1.145 Energy delivered by battery per period (Joules). W .0587 Calculated current at break. (amperes) c¹ 4.42 Ratio current at break / final current. x = c¹/c₀ .682 CONTACT BREAK & CORE. Approx. flux at break. 10⁸ Lc¹/n 7380 CONTACT BREAKER PRIMARY & CORE. Approx. flux interlinkages at break. 10⁸ Lc¹ 1,328,000 Energy of magnetic field at break (joules) W¹ = ½ Lc¹² .0293 Approx. efficiency of magnetic field production. η .50 | ||
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).