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).
Letter discussing the performance and tuning of tremblers and condensers for ignition coils.
| Identifier | Morton\M11\ img067 | |
| Date | 14th August 1917 | |
| TUNING TREMBLER COILS Ref Condensers (?) for Trembler Ign coils Tuning 312 gap St.{Capt. P. R. Strong} Margaret's Bay. TO Mr. Hillis from R.{Sir Henry Royce} c. to Clk. c. to HS.{Lord Ernest Hives - Chair} ORIGINAL RECEIVED 16 AUG 1917 Re - Tremblers. R10/W14817. IA/E/17. 14/8/17. With reference to the tremblers belonging to the car it appears that the American battery ignition people find, as we have found, that the condenser should be quite close across the make and brake, that is to say, there should be no length of wire between the platinum points and the two sides of the condenser. This suggests on our cars the use of two condensers - one across the trembler and one across the contact maker. It might be tried whether this arrangement had any influence as to whether the platinum points would remain in good order. You will remember that some little time ago I suggested the use of a condenser over and above the best size for the spark, for the object of reducing the burning of the platinum but I do not know whether you have had time to test this. Referring to the Carpentier trembler the one on 49-CB has never worked very satisfactorily. I have done the platinum points up several times and tried every adjustment that was possible but never could get a very steady secondary spark - I find, however, that by shortening the spiral spring so that the iron armature was returned to its stop in quicker time considerable improvement resulted and I want you to make a definite experiment of reducing the inertia of the X1777 | ||