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).
Specifications for the windings and condenser of a Watford Magneto Armature.
| Identifier | ExFiles\Box 48\2\ Scan377 | |
| Date | 8th May 1928 | |
| E7.C X.8796 8.5.28. 3 E06 WATFORD MAGNETO ARMATURE. PRIMARY - 148 turns of .028 - 22 S.W.G. enamelled Copper Wire in four layers, wound within 1/8" of ends of core, the core being well insulated. No joints, the primary is one piece end to end. The insulation layer to layer being .010 oil silk. SECONDARY - One layer .025 oil silk between primary and secondary. 44 S.W.G. enamelled wire, start soldered to primary, finish just wound round a piece of .028 wire to come out to slip ring, sec. wound to within 3/16 of end. No varnish on ends. Condenser. Mica and tinfoil. capacity .18 mf. L.E.W | ||