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 wire arrangement and dimensions within slots.
| Identifier | ExFiles\Box 39\2\ Scan032 | |
| Date | 6th December 1920 guessed | |
| (3) WIRES IN SLOT. Slot Insulation on width. = .030 " " etc." depth. = .090 Wires arranged in 4 x 2 = 8 x 2 = 16 cond. per slot. 20 S.W.G. = .036} } .005 for D.S.C. 22 S.W.G. = .028} 27 slots (20 S.W.G.) 31 slots (22 S.W.G.) & .041 .041 .033 .033 8 2 8 2 ____ ____ ____ ____ .328 .082 .264 .066 .090 .030 .090 .030 ____ ____ ____ ____ .418 .112 .354 .096 .005 .005 .005 .005 ____ ____ ____ ____ .423 .117 .359 101 ====== ====== ====== ====== 2.750 2.750 .846 .720 _____ _____ 1.904 x 11 2.030 x 11 ---------- = .221 ---------- = .206 27 31 _____________ | ||