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).
Graph showing temperature time curves for a Goshawk engine ignition coil under various test conditions.
| Identifier | WestWitteringFiles\J\December1922\ Scan88 | |
| Date | 13th December 1922 | |
| TEMPERATURE TIME CURVES OF IGNITION COIL ON GOSHAWK TEMPERATURE (°C) TIME (MINUTES) ① COIL IN STABALITE CASE. ② COIL IN BAKELITE CASE, UNINSULATED, STD POSITION. ③ SAME AS IN 2 BUT INSULATED. ④ SAME COIL AS IN 2 BUT UNINSULATED ON BRACKET. ⑤ SAME AS IN 4 BUT INSULATED. TEMPERATURE AT WHICH COIL BROKE DOWN C.A.P 13/12/22 E.F.C 14/12/22 | ||