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).
Acceptance test log for Watford Aero Magnetos to an abridged specification.
| Identifier | ExFiles\Box 43\4\ Scan302 | |
| Date | 23th October 1930 | |
| X 4021 (Form only 6 copies) WATFORD AERO MAGNETOS. X.4021. ACCEPTANCE TEST TO ABRIDGED SPECIFICATION. | Date. | Magneto No. | (1) Remarks. | (2) Remarks. | (3) Min. sparking speeds. (a) | (3) Min. sparking speeds. (c) | (4) Remarks | |----------|---------------|--------------|--------------|-------------------------------|-------------------------------|-------------| | 11-2-30 | SP{Mr Spinney}12-5 98088 | OK | OK | 250 | 360 | OK | | 12-2-30 | SP{Mr Spinney}12-5 98090 | OK | OK | 140 | 300 | OK | | 6-3-30 | SP{Mr Spinney}12-5 98101 | OK | OK | 120 | 260 | OK | | 6-3-30 | SP{Mr Spinney}12-5 98102 | OK | OK | 130 | 350 | OK | | 18-7-30 | IS12 98034 | OK | OK | 140 (Braided cables) | 320 | OK | | 23-10-30 | IS.12. 83119 | OK | OK | 60 | 400 | OK | | 23-10-30 | IS.12. 83120 | OK | OK | 85 | 190 | OK | | 22-9-30 | IS12 83132 | OK | OK | 110 (Braided cables) | 270 | OK | E.{Mr Elliott - Chief Engineer} & O.E. | ||