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).
Design and winding specifications for various electrical coils.
| Identifier | ExFiles\Box 164\5\ img372 | |
| Date | 12th July 1938 guessed | |
| PARTICULARS OF DESIGN & WINDING QUANTITIES. R.R. COIL D.72503 PRIMARY WDG. 300 TURNS OF 22 S.W.G. ENAM. S.C.C. COPPER WIRE. RESISTANCE · 967 OHMS AT 19°C. IMPEDANCE · 3·72 OHMS AT 19°C. INDUCTANCE · ·0114 HENRIES. SECONDARY WDG. 21,000 TURNS OF 44 S.W.G. ENAM. COPPER WIRE. RESISTANCE · 8640 OHMS, AT 19°C. IMPEDANCE · 18700 OHMS, AT 21°C. INDUCTANCE · 53·6 HENRIES. R.R. COIL D.75260. PRIMARY WDG. 290 TURNS OF 21 S.W.G. S.C.C. ENAM. COPPER WIRE. RESISTANCE · 737 OHMS AT 16·5°C. IMPEDANCE · 3·27 OHMS AT 16·5°C. INDUCTANCE · ·01012 HENRIES. SECONDARY WDG. SIMILAR TO D.72503. R.R. COIL D.75672. PRIMARY WDG. 285 TURNS OF 20 S.W.G. S.P. ENAM. COPPER WIRE. RESISTANCE · 1·01 OHMS AT 18°C. IMPEDANCE · 2·94 OHMS AT 18°C. INDUCTANCE · ·0088 HENRIES. SECONDARY WDG. 20,000 TURNS OF 44 S.W.G. ENAM. COPPER WIRE. RESISTANCE · 5800 OHMS AT 18°C. IMPEDANCE · 15000 OHMS AT 18°C. INDUCTANCE · 44·1 HENRIES. R.R. COIL D.75672 MODIFIED. Diagram Labels: AERO-COIL D.C. 277. R.R. COIL D.75672. R.R. COIL D.7562 MOD. R.R. COIL D.75260. R.R. COIL D.72503. Table Labels (partially visible): ...BUTOR ...PPLY ...OWRAY ...UTPUT LOAD ...DINGS | ||