Rolls-Royce Archives
         « Prev  Box Series  Next »        

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.
  
  


Copyright Sustain 2025, All Rights Reserved.    whatever is rightly done, however humble, is noble
An unhandled error has occurred. Reload 🗙