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).
The construction of a new cylindrical condenser for the J. 3. ignition system, comparing various manufacturers.
| Identifier | ExFiles\Box 178\3\ img112 | |
| Date | 14th March 1932 | |
| K.{Mr Kilner} FROM E.{Mr Elliott - Chief Engineer} C. to SG.{Arthur F. Sidgreaves - MD} WCR. HS.{Lord Ernest Hives - Chair} C. to BY Mr BROCK WST ORIGINAL. J.{Mr Johnson W.M.} 3. & PEREGRINE CONDENSER FOR IGNITION TOWER EL/W14.3.32. X6052 It has been necessary to decide on the construction of the new cylindrical type of condenser for our J.{Mr Johnson W.M.} 3. ignition. Our present 20/25 type is wound to a circular form and then pressed flat. After examining the details of the Delco-Remy, Bosch, Lucas, and others, and also bearing our own experience in mind, it appeared to me that the following main conditions should be satisfied: (1) All internal connections to be soldered. (2) Condenser to be watertight. (3) Maximum number of contacts to tin foil. (4) Condenser to be held in its casing in such a manner as to avoid movement. The Lucas is a very poor affair. It relies throughout on mechanical contacts. The lid{A. J. Lidsey} of the casing is attached by indenting in two places and is certainly not watertight, while the central brass peg makes contact with one end of the tin foil only. The Bosch is a better job, but the most thorough is the Delco-Remy. The Delco-Remy satisfies all conceivable conditions. We attach herewith a print of T.53354. showing our proposed design. The condenser is wound firmly on a paxolin tube mounted on a spindle in the winding machine, and the layers of tin foil and di-electric of double waxed paper are spaced to give the desired overlap at the ends. On the Delco there is no tube, the condenser being apparently wound direct on the mandril and then withdrawn. This does not seem too easy to do. Connection to the tin foil is made by using a solder of low melting point. Delco use a metal tab at one end and afterwards soldered in with the lid{A. J. Lidsey}, and a flex at the other end. We show a flex at both ends. (1) | ||