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).
Instruction regarding the safety gap on the B.T.H SC12-7 magneto for Watford machines.
| Identifier | ExFiles\Box 43\4\ Scan027 | |
| Date | 29th June 1920 | |
| ROLLS-ROYCE LTD. INSTRUCTIONS. RR 235(100 BKS) LSHDT.29-6-20.) MP 22435 19 To Order No. Customer's No. SC12-7 Of this type, the B.T.H SC12-7 magneto has a 9.0 mm safety gap, and we consider that the safety gap on these Watford machines should be increased to 8.5 mm at least, so as to meet our specification which we are preparing, and to obtain better sparking externally. There should be no difficulty as regards insulation with this type of magneto having a stationary armature. Signed H.E.W. This Sheet must be filed on completion of the work. | ||