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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Letter to Ferodo Ltd. regarding a planned visit to Chapel-en-le-Frith to compare testing methods.7th Jan 1924Box 26 \ 4  Scan218
Letter from Ferodo Limited enclosing a diagram about the coefficient of friction for Ferodo Fibre and Ferodo Bonded Asbestos.7th Jan 1924Box 26 \ 4  Scan219
Letter from Ferodo Limited confirming a meeting and lunch arrangement.10th Jan 1924Box 26 \ 4  Scan220
Letter from Ferodo Ltd. regarding the postponement of a proposed visit.11th Jan 1924Box 26 \ 4  Scan221
Brake linings, comparing Halo and Ferodo materials and their performance when hot.15th Jan 1924Box 26 \ 4  Scan222
Hand-drawn exploded diagram of a clutch lining testing rig.15th Jul 1923Box 26 \ 4  Scan223
The wrapping and non-wrapping action of rigid brake shoes.17th Jan 1924Box 26 \ 4  Scan224
The mechanics and torque of wrapping and non-wrapping brake shoes.12th Jul 1923Box 26 \ 4  Scan225
The coefficient of friction and servo pressure for front brakes.17th Jan 1924Box 26 \ 4  Scan226
Visit to Chapel-en-le-Frith to discuss brake friction materials and squeaking issues.17th Jan 1924Box 26 \ 4  Scan227
Page 2 of an experimental report discussing clutch lining wear, testing methods, and friction coefficients.17th Jan 1924Box 26 \ 4  Scan228
Obtaining data from a servo brake.22th Jan 1924Box 26 \ 4  Scan229
Series of tests on an E.A.C. servo for a brake testing rig.1st Jan 1924Box 26 \ 4  Scan230
Tests to demonstrate the effects of speed and heat on brake linings.1st Jan 1924Box 26 \ 4  Scan231
Comparing the horsepower absorbed per square inch of lining on the 40/50 rear wheel foot brakes with that of the servo.12th Jul 1923Box 26 \ 4  Scan232
Report attributing excessive servo wear to a lack of cooling facilities causing brake linings to roast.18th Nov 1924Box 26 \ 4  Scan233
Performance analysis graphs and diagram for an E.A.C. Servo mechanism.18th Nov 1924Box 26 \ 4  Scan234
Study on the effect of high temperatures on the wear and mechanical gain factor of a servo mechanism.21th Jan 1929Box 26 \ 4  Scan235
The dispatch and examination of two sets of servo brake liners from test cars.23th Jan 1924Box 26 \ 4  Scan236
The despatch of two sets of brake liners for examination.23th Jan 1924Box 26 \ 4  Scan237
Servo brake testing, comparing cast iron liners with Ferodo material.23th Jan 1924Box 26 \ 4  Scan238
Testing E.A.C. servo brake shoes lined with cast iron.1st Jan 1924Box 26 \ 4  Scan239
E.A.C. servo performance, comparing Ferodo and cast iron liners.26th Jan 1924Box 26 \ 4  Scan240
Comparing brake performance with latest modified leverage versus standard leverages.26th Jan 1924Box 26 \ 4  Scan241
Confirmation of a telegram suggesting a test on rear brakes by removing the non-wrapping shoe.29th Jan 1924Box 26 \ 4  Scan242
Tests on brake friction, referencing an attached chart from Ferodo.2nd Feb 1924Box 26 \ 4  Scan243
Receipt of 16 sample 'HALO' Metallic Brake Shoes for practical testing.30th Jan 1924Box 26 \ 4  Scan244
Secret memo discussing the cause of 'brake jaggers' (judder), raising objections to a theory, and suggesting further tests.30th Jan 1924Box 26 \ 4  Scan245
Page two of a document discussing the requirements for a damping device.2nd Feb 1924Box 26 \ 4  Scan246
Internal memorandum requesting an order for 4 Friction Discs from Messrs. Ferodo Ltd.2nd Feb 1924Box 26 \ 4  Scan247
Letter from Ferodo Limited discussing the properties and application of Ferodo Fibre friction material.18th Feb 1924Box 26 \ 4  Scan248
Issues and potential improvements for clutch and servo linings.19th Feb 1924Box 26 \ 4  Scan249
The co-efficient of static friction of brake shoes.19th Feb 1924Box 26 \ 4  Scan250
Brake and servo friction materials and issues with unequal pressure distribution from the equaliser.2nd Feb 1924Box 26 \ 4  Scan251
Drawing for an E.A.C. clutch modification, changing the driven disc material from steel to ferodo.22th Feb 1924Box 26 \ 4  Scan252
Mr. Royce's suggestions for improving braking by modifying brake shoe design and length.27th Feb 1924Box 26 \ 4  Scan253
Continued memo discussing results from designs and semi-flexible steel shoes.27th Feb 1924Box 26 \ 4  Scan254
Mechanical gain, friction, and potential issues in a new slow-speed servo for braking schemes.27th Feb 1924Box 26 \ 4  Scan255
Continued memo suggesting a test method for tying two plates together using pins underneath the ferodo plates.15th Feb 1924Box 26 \ 4  Scan256
Letter to Messrs. Ferodo Ltd. regarding an order for friction discs made from Ferodo Fibre.15th Feb 1924Box 26 \ 4  Scan257
Graph showing the average coefficient of friction and temperature rise of Ferodo bonded asbestos lining over time.8th May 1925Box 26 \ 4  Scan258
Page with handwritten calculations and an office date stamp.8th May 1925Box 26 \ 4  Scan259
Instructing the Drawing Office to change the material for servo disc facings from Ferodo to Halo.5th Jun 1924Box 26 \ 4  Scan260
Request for a report on 40/50 Brake Shoe Liners supplied by 'Scandinavia' Belting Ltd.25th Jun 1924Box 26 \ 4  Scan261
Letter from the Asbestos Brake Lining Association regarding a centralized clearing house for brake and clutch specifications.6th Oct 1924Box 26 \ 4  Scan262
Data request form for brake lining and clutch facing specifications from the Asbestos Brake Lining Association.6th Oct 1924Box 26 \ 4  Scan263
Data request form from the Asbestos Brake Lining Association for brake lining and clutch facing specifications.21th Oct 1924Box 26 \ 4  Scan264
High scrap rates for Slipper Drive Friction Discs and a proposal to test a new material.21th Oct 1924Box 26 \ 4  Scan265
Receiving brake shoe linings made from Brasbestos material for experimental purposes on the 20-HP chassis.20th Nov 1924Box 26 \ 4  Scan266
Improved form of brake lining from Creswell of Bradford with a coefficient of friction of .45.6th May 1925Box 26 \ 4  Scan267
Internal order request for half a dozen Ferodo Discs to drawing G.52141.22th May 1925Box 26 \ 4  Scan268
Letter from British Belting & Asbestos Ltd concerning clutch and brake lining performance data.10th Jul 1925Box 26 \ 4  Scan269
Requesting that two other cars being built are fitted with the newly approved 'India' servo parts for testing.14th Jul 1925Box 26 \ 4  Scan270
Covering letter forwarding correspondence from John G. Cloke regarding brake blocks used on Sunbeams.16th Jul 1925Box 26 \ 4  Scan271
Letter proposing a new 'antithermal' friction material for brake blocks and clutch inserts.14th Jul 1925Box 26 \ 4  Scan272
Letter discussing a soft yielding antithermal pad for friction applications.8th Jul 1925Box 26 \ 4  Scan273
Proposed response to a J.G. Cloke regarding an unsolicited 'Antithermal Material' sample.8th Jul 1925Box 26 \ 4  Scan274
Ferodo Ltd's materials for main clutches and servo clutches.21th Sep 1925Box 26 \ 4  Scan275
Drilling difficulties with Ferobestos non-squeaking brake liners supplied by Ferodo Ltd.25th Sep 1925Box 26 \ 4  Scan276
Efficiency of servos and the recommended method for measuring it.16th Nov 1925Box 26 \ 4  Scan277
Comparison of the coefficient of friction over time for mild steel on cast iron versus 'Halo' asbestos brake lining.19th Feb 1926Box 26 \ 4  Scan278
Letter from Ferodo Limited discussing collan oil as a dressing for asbestos brake linings and the causes of brake squealing.19th Feb 1926Box 26 \ 4  Scan279
Letter from Ferodo Limited discussing brake lining noise, glazing, and performance comparisons.19th Feb 1926Box 26 \ 4  Scan280
Comparison of the coefficient of friction over a 10-minute period for 'Mintex' flexible brake lining versus Cast Iron on Cast Iron.21th Jan 1926Box 26 \ 4  Scan281
Letter to Ferodo Ltd. confirming a thorough test on 'Ferobestos' impregnated with oil compounds for its anti-squeaking properties.21th Jan 1926Box 26 \ 4  Scan282
The despatch of Ferobestos brake linings to Messrs. Ferodo.2nd Feb 1926Box 26 \ 4  Scan283
Letter to Ferodo regarding the testing of 'Ferobestos' brake lining and issues with brake squeaks.12th Feb 1926Box 26 \ 4  Scan284
Experiment with 'Perlit' brake shoe material.1st Mar 1926Box 26 \ 4  Scan285
Advertisement for 'Fibrent' pure asbestos brake linings, friction linings, super motor jointing and asbestos millboard.1st Mar 1926Box 26 \ 4  Scan286
Advertisement and price list for 'Fibrent' asbestos brake linings.1st Mar 1926Box 26 \ 4  Scan287
Advertisement for Fibrent asbestos brake lining by British Fibro Asbestos Products, Ltd.13th Mar 1926Box 26 \ 4  Scan288
Letter chasing up a promised delivery of brake lining, stated to be free from squeaking tendencies, from Messrs. Ferodo.13th Mar 1926Box 26 \ 4  Scan289
Letter from Ferodo Limited concerning a delay in supplying experimental brake linings and a reference to Colan oil.16th Mar 1926Box 26 \ 4  Scan290
Letter to Ferodo Ltd. regarding the supply and testing of oil impregnated and bonded asbestos brake linings.12th Apr 1926Box 26 \ 4  Scan291
Letter from Ferodo Limited regarding an omission of parts for 20 HP and 40/50 HP cars in a consignment of experimental brake linings.15th Apr 1926Box 26 \ 4  Scan292
Experiments with brake linings and lubricants to overcome squeaking front brakes.17th Apr 1926Box 26 \ 4  Scan293
Instructing stores to send two clutch plates to Ferodo Ltd. to have friction material die-pressed onto them.20th Apr 1926Box 26 \ 4  Scan294
Letter to Ferodo Ltd. regarding the development and testing of clutch plates with moulded friction fabric for 40/50 HP and 20 HP cars.20th Apr 1926Box 26 \ 4  Scan295
Letter from Ferodo Limited concerning the materials and production of special clutch discs.23th Apr 1926Box 26 \ 4  Scan296
Testing of new Ferodo Bonded Asbestos brake linings for models 11-G-11 and 12-EX.27th Apr 1926Box 26 \ 4  Scan297
Letter to Ferodo Ltd. requesting the co-efficient of friction and wearing qualities for newly received anti-squeaking brake linings.27th Apr 1926Box 26 \ 4  Scan298
Letter from Ferodo Limited detailing the coefficient of friction and wear characteristics of an experimental brake lining.29th Apr 1926Box 26 \ 4  Scan299
Letter to Messrs. Ferodo Ltd. regarding the delivery status of 40/50 HP clutch plates.29th Apr 1926Box 26 \ 4  Scan300
Letter from Ferodo Limited regarding a delay in the preparation of experimental clutch plates.1st May 1926Box 26 \ 4  Scan301
Decision to replace the 20 HP dynamo pinion brake component with a new die-pressed Ferobestos part.7th May 1926Box 26 \ 4  Scan302
Letter to Ferodo Ltd. regarding experiments with anti-squeaking brake lining and clutch plate materials.19th May 1926Box 26 \ 4  Scan303
Request to dispatch a 40/50 HP Clutch Plate to Messrs. Ferodo Ltd.19th May 1926Box 26 \ 4  Scan304
Letter from Ferodo Limited agreeing to supply brake linings and discussing the manufacturing of a clutch plate.25th May 1926Box 26 \ 4  Scan305
Issues with an experimental 12-EX clutch and potential friction materials.31th May 1926Box 26 \ 4  Scan306
Letter from Ferodo Limited concerning the forwarding of a 20HP Clutch Disc for testing.4th Jun 1926Box 26 \ 4  Scan307
Letter from Ferodo Limited regarding the completion and dispatch of 40/50 HP Clutch Plates.4th Jun 1926Box 26 \ 4  Scan308
Order confirmation from Ferodo Limited for steel clutch discs lined with friction material.5th Jun 1926Box 26 \ 4  Scan309
Advice note from Ferodo Limited for lined steel discs.5th Jun 1926Box 26 \ 4  Scan310
Performance concerns for a new Ferodo brake material related to heat, moisture, and rusting of the brake drums.10th Jun 1926Box 26 \ 4  Scan311
Letter to Ferodo Ltd. regarding the testing of oil-impregnated brake and clutch linings.16th Jun 1926Box 26 \ 4  Scan312
Proposal from supplier Morgan, Crossley & Co. for their TENOID asbestos brake linings, claimed to be superior to Ferodo.9th Nov 1926Box 26 \ 4  Scan313
Technical memorandum discussing the issue of squeaking brakes and potential solutions.19th Nov 1926Box 26 \ 4  Scan314
Letter to Morgan, Crossley & Co. Ltd. acknowledging receipt of information on brake linings, which is being returned.14th Dec 1926Box 26 \ 4  Scan315
Modifying brake shoes to eliminate squeaks on the 40/50 HP lightened axle.15th Dec 1926Box 26 \ 4  Scan316
Ongoing testing of brake components, including duralumin shoes, drum dampers and brake straps.15th Dec 1926Box 26 \ 4  Scan317


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