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 sheet detailing a utility test on magnetos, noting the effect of safety gap size.
| Identifier | ExFiles\Box 4\5\ 05-page118 | |
| Date | 24th May 1919 | |
| R.P.960 (1268) [SF 349 24-5-19] PSP 200552 88256 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To Order No. Condenser No. 2 Re Utility Test of Magnetos (Condd) doubtless do much better if the safety gap were wider. Conditions | Mean-gap. Mms. of gap under test. | Advanced | Centre | Retarded Without coils shunted | 5.0 | 4.0 | 6.0 With 2 coils(par:)/prim open | 5.0 | 4.0 | 4.5 " " /prim closed | 4.75 | 4.25 | 4.75 " " both prims " | 4.25 | 4.25 | 5.25 " 1 coil, prim. open. | 4.5 | 4.0 | 4.75 " " " closed. | 3.5 | 4.0 | 5.25 Signed Francis J Allen This Sheet must be filed on completion of the work. | ||