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).
Production inspection and test log for Watford Type EW6 magnetos.
| Identifier | ExFiles\Box 65\3\ scan0219 | |
| Date | 12th March 1928 | |
| X.7791. X.878lm. WATFORD TYPE EW6 MAGNETO. X.7791. PRODUCTION INSPECTION AND TEST. Date. Magneto No. (1) Remarks. (2) Range (degrees) (>58°) (3) Remarks. (4) Tangl. force. 1 to 2 lbs. (5) Remarks. (6) Remarks. (7) Min. sparking speeds (a) 120 (b) 160 (c) 190 11-12-27 100080 Safety gap too small 58° OK 1.0 OK OK 80 120 155 13-12-27 100081 " — OK — OK OK 125 140 160 6-2-28 100082 " 60° OK 1.0 OK OK 70 100 140 31-1-28 100093 OK 60° OK 2.0 OK. OK 90 130 200 6-2-28 100094 safety gap too small 60° OK 3.0 tight in places OK OK 90 130 200 6-2-28 100097 OK 60° OK 2.5 OK OK 85 130 190 3-3-28 106012 OK 60° — .75 OK OK 70 110 170 12-3-28 99802 OK 60° — — OK OK 110 130 160 3.2.28. | ||