| Description | Date | Identifier | |
| Notice regarding complaints of squeaking brakes due to distorted tipping shoes on 20/25 HP models. | 25th Mar 1936 | Box 102 \ 3 scan0177 | |
| Request to manufacture a new camshaft for testing power improvements on a 25/30 HP engine. | 27th Mar 1936 | Box 102 \ 3 scan0178 | |
| Specifications for the Front Brake Compensating Shaft on 25/30 and Bentley models. | 5th Apr 1936 | Box 102 \ 3 scan0179 | |
| The specifications for the front brake compensating shaft for 25/30 and Bentley models. | 3rd Apr 1936 | Box 102 \ 3 scan0180 | |
| Investigation into rear brake trouble on the 25/30 HP model, specifically the toggle actuating shaft seizure and bearing lubrication. | 9th May 1936 | Box 102 \ 3 scan0181 | |
| Issues with 25/30 HP brake pilot shoes and proposed modifications. | 18th May 1936 | Box 102 \ 3 scan0182 | |
| Investigation into squeaking and bending issues with 25/30 HP brake pilot shoes. | 25th May 1936 | Box 102 \ 3 scan0183 | |
| Performance and material of brake shoes. | 25th May 1936 | Box 102 \ 3 scan0184 | |
| Photograph of a wrapping shoe with annotated thickness measurements. | 23th Sep 1936 | Box 102 \ 3 scan0185 | |
| Suggestions for improving the lubrication of rear brake camshafts for 25/30 Brakes. | 23th Sep 1936 | Box 102 \ 3 scan0186 | |
| Investigation into brake and servo inefficiency on a 30 HP car. | 30th Oct 1936 | Box 102 \ 3 scan0187 | |
| Page 2 of a memo confirming a specific action is not part of the standard production process. | 16th Dec 1936 | Box 102 \ 3 scan0188 | |
| Modified lubrication for rear brake actuating shafts on the 25/30 model. | 16th Dec 1936 | Box 102 \ 3 scan0189 | |
| Request to fit two sets of oiling schemes for the 25/30 HP rear brakes to specific chassis. | 13th Feb 1937 | Box 102 \ 3 scan0190 | |
| Requesting the examination of all brakes and for an oil leak from the N.S.R. brake drum to be attended to. | 1st Mar 1937 | Box 102 \ 3 scan0191 | |
| Modifications to a car's rear axle and brakes for testing purposes. | 5th Mar 1937 | Box 102 \ 3 scan0192 | |
| Standardisation of parts for a spring to hold the hand brake lever in the 'off' position to prevent rattles. | 24th Feb 1937 | Box 102 \ 3 scan0193 | |
| Cost estimate for new tools and their production implementation on the 'P2' Series chassis. | 26th May 1937 | Box 102 \ 3 scan0194 | |
| Troubleshooting brake squeaks on a 25/30 model by testing new Ferodo ML linings on a service car. | 26th May 1937 | Box 102 \ 3 scan0195 | |
| Request to reline the front and rear foot brakes for Chassis 21.G.1V (25/30.HP.). | 31th May 1937 | Box 102 \ 3 scan0196 | |
| Brake squeak issues for the 25/30 Aero Service Car 21.G.IV after 5250 miles. | 2nd Aug 1937 | Box 102 \ 3 scan0197 | |
| Unsatisfactory M.L. brake linings and the subsequent repair of a 25/30 Aero Servicecar. | 5th Aug 1937 | Box 102 \ 3 scan0198 | |
| The dismantled brake mechanism concerning the modified lubrication of the brake actuating shaft. | 7th Sep 1937 | Box 102 \ 3 scan0199 | |
| Standardisation of parts for improved lubrication to brake torsion shaft bearings on the rear axle. | 31th Aug 1937 | Box 102 \ 3 scan0200 | |
| Cost estimate and production timeline for new tooling for the 'S2' Series chassis. | 1st Sep 1927 | Box 102 \ 3 scan0201 | |
| Modified lubrication of the rear brake actuating shafts for the 25/30-HP chassis. | 12th Jan 1938 | Box 102 \ 3 scan0202 | |
| List of part number changes and additions for the Standard Production 25/30-HP Chassis. | 12th Jan 1938 | Box 102 \ 3 scan0203 | |
| Modification to the lubrication of rear brake actuating shafts for the 25/30-HP Chassis. | 2nd Feb 1938 | Box 102 \ 3 scan0204 | |
| Part number replacement and update notice for schemes Sec.6120 and Sec.6130. | 2nd Feb 1938 | Box 102 \ 3 scan0205 | |
| Enclosing a letter from the Zenith Carburetter Co. about complaints regarding various components. | 25th Apr 1939 | Box 102 \ 3 scan0206 | |
| Letter from Zenith Carburetter Co Ltd regarding idle mixture screw issues on 'Wraith' and 'Phantom III' carburetters. | 20th Apr 1939 | Box 102 \ 3 scan0207 | |
| Response letter from Zenith Carburetter Co. regarding complaints about stretched threads, rusting springs, and floats. | 20th Apr 1939 | Box 102 \ 3 scan0208 | |
| Letter from The Zenith Carburetter Co. apologising for a defect. | 20th Apr 1939 | Box 102 \ 3 scan0209 | |
| Carburetter leaks on the 25/30 HP model due to float chamber cover distortion and recommending a modification. | 24th Apr 1939 | Box 102 \ 3 scan0210 | |
| Full bore flooding tests for the Stromberg Carb.DG.42. | 16th Aug 1938 | Box 102 \ 3 scan0211 | |
| Fuel flow tests and hot starting performance on gradients for 25/30 and Wraith cars. | 10th Aug 1938 | Box 102 \ 3 scan0212 | |
| Report comparing fuel flow rates in pints per hour for two setups (A 25/30 and B WRAITH) under different road conditions. | 16th Aug 1938 | Box 102 \ 3 scan0213 | |
| Modification scheme to prevent the sticking of the non-return ball valve on the hot spot petrol drain pipe for the 25/30 HP model. | 18th Jul 1938 | Box 102 \ 3 scan0214 | |
| Suggestion to modify the carburetter float chamber covers on the 25/30 HP model. | 4th Jul 1938 | Box 102 \ 3 scan0215 | |
| Complaints about the 25/30 carburetter. | 15th Jun 1938 | Box 102 \ 3 scan0216 | |
| Bumping test for an 'India' Rear Axle with a wider track. | 23th May 1925 | Box 102 \ 4 scan0001 | |
| Bump test of a 20 HP 'India' chassis. | 22th May 1925 | Box 102 \ 4 scan0002 | |
| Chassis component failures, including cross members and spring stops, under stress testing. | 1st May 1925 | Box 102 \ 4 scan0003 | |
| Chassis spring failures, detailing life, fracture points, and material tests. | 22th May 1925 | Box 102 \ 4 scan0004 | |
| Comparative test report on rear axle bevel pinion thrust bearings for the 20HP model. | 24th Jul 1925 | Box 102 \ 4 scan0005 | |
| Results of comparative thrust bearing tests, including wear and failure analysis. | 13th Oct 1925 | Box 102 \ 4 scan0006 | |
| Excellent performance of a new rear axle bevel pinion thrust bearing following a 10,000-mile test. | 13th Oct 1925 | Box 102 \ 4 scan0007 | |
| Comparative tests on 20 HP rear axle bevel pinion thrust bearings. | 12th Jun 1925 | Box 102 \ 4 scan0008 | |
| Comparing different types of thrust bearings under various test conditions. | 12th Jun 1925 | Box 102 \ 4 scan0009 | |
| Examination report on a New Departure Bearing used for a pinion thrust after a 10,000-mile test, noting negligible wear. | 14th Oct 1925 | Box 102 \ 4 scan0010 | |
| Standardisation of a thrust race for the rear axle bevel pinion. | 14th Oct 1925 | Box 102 \ 4 scan0011 | |
| Proposing a proactive, free-of-charge replacement for the 20 HP Rear Axle Thrust Bearing. | 25th Feb 1926 | Box 102 \ 4 scan0012 | |
| Standardisation of a new departure thrust bearing for the 20 HP rear axle. | 26th Feb 1926 | Box 102 \ 4 scan0013 | |
| Failure of axle 10-G-111 and proposed improvements to the Phantom steering springs. | 30th Apr 1926 | Box 102 \ 4 scan0014 | |
| The failure of a rear axle on car 10-C-111 in France due to incorrect thrust bearings. | 3rd May 1926 | Box 102 \ 4 scan0015 | |
| Body weight limitations, accessories, axle ratios, and engine modifications for the 20 HP chassis. | 3rd Dec 1926 | Box 102 \ 4 scan0016 | |
| Continuation page discussing a light 20 HP chassis and potential modifications to the front axle control. | 14th Dec 1926 | Box 102 \ 4 scan0017 | |
| Trying a preferred 10/47 back axle ratio for the Indian market. | 14th Dec 1926 | Box 102 \ 4 scan0018 | |
| Gear ratio and testing schedule for a 20 HP experimental car. | 8th Feb 1927 | Box 102 \ 4 scan0019 | |
| New axle and gear reduction for the 20 HP car, citing crankshaft limitations at 3300 revs. | 1st Feb 1927 | Box 102 \ 4 scan0020 | |
| Complaint about oil leakage from the rear axle of a 20-HP chassis disfiguring coachwork in Australia. | 30th May 1927 | Box 102 \ 4 scan0021 | |
| Letter discussing product feedback on rear axles and power, including comparisons to a competitor's vehicle. | 10th Jan 1928 | Box 102 \ 4 scan0022 | |
| Query about improving a 20 HP car's acceleration for a customer by using a lower geared axle and increased compression. | 28th Mar 1928 | Box 102 \ 4 scan0023 | |
| Stating a lower geared axle or higher compression cannot be recommended for the 20 HP model. | 1st Apr 1928 | Box 102 \ 4 scan0024 | |
| Offer for a Sensaud de Lavaud differential to be fitted to a 20 HP car. | 4th Apr 1928 | Box 102 \ 4 scan0025 | |
| Alternative design for the central oiling connection to the back axle. | 14th Apr 1928 | Box 102 \ 4 scan0026 | |
| Failures and costs related to the 20 HP rear axle thrust and distance pieces. | 9th May 1928 | Box 102 \ 4 scan0027 | |
| Failures and modifications of the 20 HP rear axle thrust bearings. | 10th May 1928 | Box 102 \ 4 scan0028 | |
| Effects of different tyre sizes and axle types on the 20 HP model's overall gear ratio. | 9th May 1928 | Box 102 \ 4 scan0029 | |
| Axle ratios and tyre options for the 20 HP car. | 22th May 1928 | Box 102 \ 4 scan0030 | |
| Axle ratios and tyre sizes for the 20 HP model. | 23th May 1928 | Box 102 \ 4 scan0031 | |
| Centralised chassis lubrication for the India 3 rear axle, referencing drawing numbers 2621/24. | 6th May 1928 | Box 102 \ 4 scan0032 | |
| Standardisation of chassis parts, proposing a reduced axle ratio as an alternative to increase performance. | 19th May 1928 | Box 102 \ 4 scan0033 | |
| Lower axle ratio on the 20 HP car and its implications for tyre size and bodywork modifications. | 15th Jun 1928 | Box 102 \ 4 scan0034 | |
| Standardisation sheet for a new, lower rear axle ratio for the 20 HP chassis to accommodate balloon tyres. | 15th Jun 1928 | Box 102 \ 4 scan0035 | |
| The axle ratio for Mr. Royce's car and two 'India 3's' cars. | 2nd Jul 1928 | Box 102 \ 4 scan0036 | |
| Gearbox and back axle ratios, supercharging, and engine perfection. | 21th Sep 1928 | Box 102 \ 4 scan0037 | |
| Alterations to the rear hub and brake drum for the 'India 4' rear axle. | 7th Nov 1928 | Box 102 \ 4 scan0038 | |
| Secret memorandum regarding the design and specifications for a hypoid rear axle casing for the 20 HP model. | 29th May 1929 | Box 102 \ 4 scan0039 | |
| Development progress on projects codenamed 'China' and 'Japan', detailing engine components and axle design. | 1st Nov 1929 | Box 102 \ 4 scan0040 | |
| Proposing testing procedures to standardise a new hypoid rear axle for the 20 HP car. | 16th Dec 1929 | Box 102 \ 4 scan0041 | |
| Testing protocol for a hypoid rear axle on 20 HP experimental cars. | 18th Dec 1929 | Box 102 \ 4 scan0042 | |
| Testing and standardisation procedures for the 20/25 HP Hypoid Rear Axle. | 19th Dec 1929 | Box 102 \ 4 scan0043 | |
| Trade-offs of using a higher gear ratio on the 20/25 model and requesting experimental results. | 24th Dec 1929 | Box 102 \ 4 scan0044 | |
| Tests of a 12/50 axle ratio on a 20/25 HP experimental car, comparing its performance to the standard 11/50 ratio. | 27th Dec 1929 | Box 102 \ 4 scan0045 | |
| Revised procedure for the Bijur lubrication of axles due to oil filling difficulties. | 1st Jan 1930 | Box 102 \ 4 scan0046 | |
| The design of an oil lubrication system for axles, involving air-vessels, a one-shot chassis system, and a Bijur pump. | 1st Jan 1930 | Box 102 \ 4 scan0047 | |
| Updated instructions for lubricating axles with an oil gun, to be inserted into 20 HP and Phantom II instruction books. | 1st Jan 1930 | Box 102 \ 4 scan0048 | |
| Withdrawal of the hypoid pinion on the 20HP Hypoid Rear Axle for inspection. | 21th Jan 1930 | Box 102 \ 4 scan0049 | |
| Stress calculations and dynamometer testing for the 20 HP rear axle driving shafts. | 21th Jan 1930 | Box 102 \ 4 scan0050 | |
| Comparative test report on rear axle gear ratios (11/50 vs 12/50) for 25 HP high compression cars. | 7th Feb 1930 | Box 102 \ 4 scan0051 | |
| Performance comparison of two different axle ratios, including hill climb tests and recommendations for a 25 HP car. | 1st Feb 1930 | Box 102 \ 4 scan0052 | |
| Comparison of car performance and noise using an 11/50 ratio with rubber engine mounting versus a standard 25 HP car. | 7th Jan 1930 | Box 102 \ 4 scan0053 | |
| Nineteenth Design Committee report regarding a 10,000-mile test on car 14-G4, detailing issues and modifications for the exhaust pipes, exhaust valves, and rear axle. | 1st Apr 1930 | Box 102 \ 4 scan0054 | |
| Dynamometer tests of Hypoid Rear Axles to assess failure from low oil levels and cold temperatures. | 23th Apr 1930 | Box 102 \ 4 scan0055 | |
| Axle failures, the performance of Whitmore's oil, and tests on pinion teeth. | 7th May 1930 | Box 102 \ 4 scan0056 | |
| Fault with the thrust bearings on a 20/25 HP hypoid rear axle and suggesting a modification. | 7th May 1930 | Box 102 \ 4 scan0057 | |
| Schemes for pipe coils for the centralised chassis lubrication on a 20/25 HP model. | 24th Jul 1930 | Box 102 \ 4 scan0058 | |
| Centralised chassis lubrication for the 20/25 HP model, enclosing a schematic for the rear axle piping arrangement. | 20th Aug 1930 | Box 102 \ 4 scan0059 | |
| Issue with an aluminium clip in the rear axle's centralised lubrication system. | 7th Jan 1931 | Box 102 \ 4 scan0060 | |
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