Rolls-Royce Archives
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).
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Instruction sheet regarding the reliability and suitability of untested parts from group A for the RR car.24th Jan 1919Box 34 \ 1  Scan227
The systematic investigation of Dubilier made condensers for battery ignition.21th Mar 1921Box 34 \ 1  Scan228
Proposal for an additional resonance test on Dubilier made condensers to detect weaknesses.21th Mar 1921Box 34 \ 1  Scan229
The testing of condensers, detailing a resonance test and listing serial numbers of units considered acceptable for car use.21th Mar 1921Box 34 \ 1  Scan230
Table outlining special tests conducted on twelve Dubilier made condensers for battery ignition.21th Mar 1921Box 34 \ 1  Scan231
Results of a series of bench and production tests on three groups of components.10th Dec 1930Box 34 \ 1  Scan232
Report page detailing the results of three tests on components from Group D.10th Dec 1940Box 34 \ 1  Scan233
Extract from a report on electrical matters, discussing battery ignition systems.19th Mar 1921Box 34 \ 1  Scan234
Production cost of battery ignition condensers and the possibility of outsourcing.1st Apr 1921Box 34 \ 1  Scan235
Comparison table of various condensers, detailing currents and estimated capacities at different voltages.2nd Apr 1921Box 34 \ 1  Scan236
Status report on various condensers in the Experimental Department.2nd Apr 1921Box 34 \ 1  Scan237
Unsatisfactory reliability test results of Dubilier condensers compared to in-house versions.4th Apr 1921Box 34 \ 1  Scan238
Instruction sheet detailing the test results for Dubilier made condensers.7th Apr 1921Box 34 \ 1  Scan239
Query regarding the status of Dubilier make condensers after testing in the Experimental Department.7th Apr 1921Box 34 \ 1  Scan240
Letter from Dubilier Condenser Co. Ltd. regarding the testing of chassis condensers.12th Apr 1921Box 34 \ 1  Scan241
Unofficial visit to condenser supplier, Dubilier Co., discussing manufacturing processes and potential improvements.19th Dec 1920Box 34 \ 1  Scan242
Reliability and testing results of Dubilier and R.R. condensers.18th Apr 1921Box 34 \ 1  Scan243
Continued letter urging the Dubilier Company to build condensers in a dustless environment to avoid troubles.18th Apr 1921Box 34 \ 1  Scan244
The comparative reliability testing of Dubilier make condensers against the company's own.27th Apr 1921Box 34 \ 1  Scan245
The comparative testing of Dubilier and Rolls Royce condensers, with a proposal for their use in production.2nd May 1921Box 34 \ 1  Scan246
Request for information on the capacity and construction of a Delco Packard condenser for the Goshawk II engine.28th May 1921Box 34 \ 1  Scan247
Feedback from Mr. Royce on the blueprint for a 40/50 HP Battery Ignition Condenser, suggesting alterations.4th Jun 1921Box 34 \ 1  Scan248
The performance of two batches of Dubilier Condensers and a request to mark them distinctively.8th Jun 1921Box 34 \ 1  Scan249
Confirmation of a telegram from Royce concerning ignition condenser and contact trouble.9th Jun 1921Box 34 \ 1  Scan250
Instruction sheet detailing the capacities of two condensers from aero distributors for a Goshawk II engine and a 3EX chassis.9th Jun 1921Box 34 \ 1  Scan251
The ignition system components for the 4-EX vehicle after its return from America.21th Jun 1921Box 34 \ 1  Scan252
Page questioning the reliability of a condenser's construction.10th Dec 1929Box 34 \ 1  Scan253
Preferred insulation material for a condenser on a 40/50 HP chassis.23th Jun 1921Box 34 \ 1  Scan254
Request to test four Dubilier Condensers reported to have excessively high capacity.25th Jun 1921Box 34 \ 1  Scan255
Instructions regarding the testing and return of faulty Dubilier Condensers.23th Jun 1921Box 34 \ 1  Scan256
The testing and return of three out of four Dubilier condensers, one of which failed during a high-voltage resonance test.14th Jul 1921Box 34 \ 1  Scan257
Instruction note regarding testing of four Dubilier condensers which have excess capacity.4th Jul 1921Box 34 \ 1  Scan258
Instructions detailing a comparison test of different condensers against a standard on a distributor with platinum-iridium points.6th Nov 1918Box 34 \ 1  Scan259
Instructions regarding condenser capacity to prevent misfires and splashing at the contact points.6th Nov 1918Box 34 \ 1  Scan260
Instruction to test a series of condensers to determine an upper limit and check resonance with an ignition coil.6th Nov 1918Box 34 \ 1  Scan261
Instruction sheet detailing the inspection of condensers and their suitability for production.6th Nov 1918Box 34 \ 1  Scan262
Electrical characteristics for Remy 6 cylinder, 6-volt ignition coils.13th Jul 1921Box 34 \ 1  Scan263
Authorising an increase in the top capacity limit for Dubilier condensers used in battery ignition.14th Jul 1921Box 34 \ 1  Scan264
Technical description and comparison of American Bosch and Westinghouse condensers for battery ignition systems.1st Dec 1918Box 34 \ 1  Scan265
Extract suggesting experiments to run tungsten contact points with increased condenser capacity.16th Aug 1921Box 34 \ 1  Scan266
The initial investigation and measurements of a U.S.A. Bosch battery ignition system.5th Sep 1921Box 34 \ 1  Scan267
Continued report on ignition systems, focusing on condenser capacity and the integration of new Bosch battery ignition sets.5th Sep 1921Box 34 \ 1  Scan268
Comparing U.S.A. Bosch paper condensers with existing mica condensers for use in battery ignition systems.16th Sep 1921Box 34 \ 1  Scan269
Conversion table for various units of electrical capacity.27th Sep 1921Box 34 \ 1  Scan270
Technical memo comparing the capacity of different mica condensers for battery ignition systems.27th Sep 1921Box 34 \ 1  Scan271
Technical report comparing the capacity, volume, and performance of various ignition condensers.27th Sep 1921Box 34 \ 1  Scan272
Continued discussion on condenser capacity for the Goshawk engine, ignition performance, and related component testing.27th Sep 1921Box 34 \ 1  Scan273
Instruction on standardising iridio-platinum contact points and increasing condenser capacity to reduce sparking.29th Sep 1921Box 34 \ 1  Scan274
The diameter of iridio-platinum contact points and an investigation into increasing condenser capacity.10th Dec 1930Box 34 \ 1  Scan275
Unfortunate error in the estimation of the useful volume for the Goshawk condenser.25th Oct 1921Box 34 \ 1  Scan276
Continued note comparing the capacity of a Bosch battery ignition system to mica and Goshawk condensers.25th Oct 1921Box 34 \ 1  Scan277
Design of an inexpensive condenser for the FE ignition system.11th Nov 1921Box 34 \ 1  Scan278
Continued discussion on using tungsten and platinum iridium points for ignition reliability.3rd Nov 1921Box 34 \ 1  Scan279
Instructions detailing a test on tungsten contact points with double capacity to suppress sparking.7th Nov 1921Box 34 \ 1  Scan280
Instruction sheet detailing a test to reproduce misfiring conditions in American distributors using tungsten points.6th Nov 1918Box 34 \ 1  Scan281
Instructions detailing a preliminary test on electrical points.6th Nov 1918Box 34 \ 1  Scan282
Investigation into metal transfer, scale formation, and rusting on a distributor roller.6th Nov 1918Box 34 \ 1  Scan283
Instructions detailing further tests on contact points using a paper dielectric condenser.6th Nov 1918Box 34 \ 1  Scan284
Instructions to test an American ignition set by fitting a mica condenser and observing for contact failure.6th Nov 1918Box 34 \ 1  Scan285
Production difficulties and experimental work on condensers, specifically regarding paper insulation.16th Nov 1921Box 34 \ 1  Scan286
Technical report discussing the difficulties and comparative analysis of different condenser types and materials.10th Dec 1939Box 34 \ 1  Scan287
The specifications and alternatives for a Goshawk ignition condenser, including consulting with Messrs. Dubilier.16th Nov 1921Box 34 \ 1  Scan288
Letter from Rolls-Royce of America regarding an enquiry into the breakdown of insulation in paper condensers.21th Nov 1921Box 34 \ 1  Scan289
Letter discussing battery ignition condenser tests and comparing test procedures.6th Sep 1921Box 34 \ 1  Scan290
Page 2 of a letter from American Bosch Magneto Corporation regarding condenser specifications and testing.21th Nov 1921Box 34 \ 1  Scan291
Questioning the purchase of Dubilier condensers and proposing design modifications for increased capacity.21th Nov 1921Box 34 \ 1  Scan292
Continued note on achieving a taper shape with square radial ends and rounded corners.21th Nov 1921Box 34 \ 1  Scan293
Supply and pricing of condensers for the 40/50 chassis from an outside supplier versus in-house production.24th Nov 1921Box 34 \ 1  Scan294
Letter from Metropolitan-Vickers Electrical Co. to Mr. Royce regarding the supply of Mica Splittings for magnetos.29th Nov 1921Box 34 \ 1  Scan295
Producing and testing six new condensers using a rediscovered varnished insulating paper for Goshawk Chassis reliability trials.2nd Dec 1921Box 34 \ 1  Scan296
Cover letter forwarding a communication from 'OY' regarding condensers.6th Dec 1921Box 34 \ 1  Scan297
Design and capacity of a new condenser for the 40/50 model's standard battery ignition.8th Dec 1921Box 34 \ 1  Scan298
Improvements for the Goshawk Condenser, including material changes and capacity adjustments.9th Dec 1921Box 34 \ 1  Scan299
Technical discussion on the materials and design of electrodes and dielectrics, with a small sketch.12th Dec 1921Box 34 \ 1  Scan300
Conversion table for various units of electrical capacity.12th Dec 1921Box 34 \ 1  Scan301
Condenser capacity for the battery ignition system of 40/50 & Goshawk engines.29th Dec 1921Box 34 \ 1  Scan302
Spark generation and condenser discharge in the Goshawk ignition system.18th Jan 1922Box 34 \ 1  Scan303
The provision of two standard 40/50 condensers with paper dielectrics for trial on experimental cars.18th Jan 1922Box 34 \ 1  Scan304
Condenser capacity tests for the Goshawk engine ignition system, noting misfiring speeds at various voltages.16th Mar 1922Box 34 \ 1  Scan305
Investigation into the performance of U.S.A. Bosch battery ignition condensers, noting capacity drop and leakage when heated.5th Aug 1921Box 34 \ 1  Scan306
Requesting to find a supplier for a portable condenser testing set.3rd Aug 1922Box 34 \ 1  Scan307
Letter from a scientific laboratory supplier redirecting an enquiry for galvanometers.5th Aug 1922Box 34 \ 1  Scan308
Letter from The General Electric Co. Ltd. acknowledging receipt of an enquiry for a Portable Testing Set for Condensers.9th Aug 1922Box 34 \ 1  Scan309
Letter from W.G. Pye & Co. proposing an alternative design for a testing instrument for Rolls-Royce.10th Aug 1922Box 34 \ 1  Scan310
Circuit diagram for a condenser testing bridge using an induction coil and telephone receiver.11th Aug 1922Box 34 \ 1  Scan311
Quotation and technical response regarding a portable testing set for condensers.11th Aug 1922Box 34 \ 1  Scan312
Quotation for a portable capacity test set from The Cambridge and Paul Instrument Company.11th Aug 1922Box 34 \ 1  Scan313
Letter from John J. Griffin & Sons, Ltd. regarding the testing of condensers.14th Aug 1922Box 34 \ 1  Scan314
Quotation from The General Electric Co. Ltd. for a High Sensitivity Ballistic Galvanometer.22th Aug 1922Box 34 \ 1  Scan315
Continuation of a letter from The General Electric Co., Ltd. regarding instrument specifications and delivery.22th Aug 1922Box 34 \ 1  Scan316
Illustration of a precision physical measurement instrument, possibly a type of galvanometer or magnetometer.22th Aug 1922Box 34 \ 1  Scan317
From Nalder Bros & Thompson Ltd declining a request.22th Aug 1922Box 34 \ 1  Scan318
And comparing options for a condenser testing instrument from various suppliers.12th Sep 1922Box 34 \ 1  Scan319
Copy of a letter from Gambrell Bros. Limited regarding a sample electrical testing instrument.24th Aug 1922Box 34 \ 1  Scan320
Offers from various suppliers for a portable condenser testing set.13th Sep 1922Box 34 \ 1  Scan321
Trial of the sample 'Onward' Galvanometer which was found unsuitable for the portable condenser testing set.21th Sep 1922Box 34 \ 1  Scan322
Despatch of a Portable Condenser Testing Set and an 'Onward' Galvanometer.22th Sep 1922Box 34 \ 1  Scan323
Request for an order to purchase various electrical components to build a portable condenser testing set.23th Nov 1922Box 34 \ 1  Scan324
Failure of battery ignition on 40/50 chassis due to premature burnout of platinum points, and a proposed fix using a different condenser.7th Jun 1923Box 34 \ 1  Scan325
Calling for a meeting to discuss differing opinions on the value of various condensers for 40/50 & 20HP models.12th Jun 1923Box 34 \ 1  Scan326


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