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).
Performance of a trembler coil on a battery ignition system and requesting a specific small model coil.
| Identifier | Morton\M2.1\ img010 | |
| Date | 12th March 1918 | |
| To EFC. from R.{Sir Henry Royce} Copy to CG. EH. RECEIVED 16 MAR 1918 7CA g.g.c 6 12th March, 1918. R5/G12318. X.682 X.562 X.1607 X.3129 ORIGINAL RE TREMBLER COIL. With reference to the trembler on 7 CA, this Battery ignition now works very nicely firing the engine at all reasonable speeds, but I want you to send me, preferably a small model coil, with a condensor coupled with very short wires across the trembler platinums, and a trembler of the same pattern, but with slightly shorter iron in the tail, arranged to give the quickest movement possible of the iron armature, and a comparatively slow return of the platinum blade. If you cannot send me the small size model coil, send me one of the ordinary size. I am proposing to use this for four-volt little pumping engine here, or if you send me a six-volt one, I will return you the one from 7 CA so that you can make a test of the current. R.{Sir Henry Royce} Sketch attached to Mr. Clark's copy. R.R. 329 v (400 J.{Mr Johnson W.M.}) (2 C. P'Boro 19-3-18) C. 1P4C | ||