| Description | Date | Identifier | |
| Internal order request for a pair of 25 HP rear road springs with a modified camber. | 15th Feb 1935 | Box 106 \ 1 scan0348 | |
| Implementation of flexible springs on the 20/25's models. | 28th Jun 1935 | Box 106 \ 1 scan0349 | |
| Instructions to send experimental 20/25 HP chassis road springs to Paris for testing on a demonstration car. | 25th Jul 1935 | Box 106 \ 1 scan0350 | |
| Experiments to improve the springing and comfort of chassis GAF-23 for Lady Guthrie. | 10th Sep 1935 | Box 106 \ 1 scan0351 | |
| The testing and standardisation of road springs for the 20/25 HP chassis. | 10th Sep 1935 | Box 106 \ 1 scan0352 | |
| Standardisation of springs for the 20/25 chassis for Continental use. | 5th Sep 1935 | Box 106 \ 1 scan0353 | |
| The performance of new intermediate springs fitted to a demonstration car, model GSF.5. | 2nd Sep 1935 | Box 106 \ 1 scan0354 | |
| Complaints of uncomfortable riding and springing in the rear seats of the 20/25 HP model. | 11th Sep 1935 | Box 106 \ 1 scan0355 | |
| Customer complaints about ride comfort, pitching, and damper performance on 20/25 Hp models. | 11th Sep 1935 | Box 106 \ 1 scan0356 | |
| Request to produce and fit a .750 inch diameter rear roll rod to a 25 HP chassis, model 18-G-IV. | 12th Sep 1935 | Box 106 \ 1 scan0357 | |
| Customer complaint about uncomfortable riding in the rear of chassis GPG-15. | 12th Sep 1935 | Box 106 \ 1 scan0358 | |
| Letter to Thomas Firth & John Brown Ltd. regarding the examination and urgent order of springs. | 11th Sep 1935 | Box 106 \ 1 scan0359 | |
| Letter confirming the commencement of manufacturing two pairs of springs to drawings F.61003 and F.61009. | 13th Sep 1935 | Box 106 \ 1 scan0360 | |
| Letter from Thos Firth & John Brown Ltd. regarding details of plate thicknesses. | 14th Sep 1935 | Box 106 \ 1 scan0361 | |
| Specifications for front and rear springs, drawings F.61003 and F.61009. | 14th Sep 1935 | Box 106 \ 1 scan0362 | |
| Rear seat discomfort due to weight distribution, with a comparative analysis of axle weights on various similar limousine models. | 14th Sep 1935 | Box 106 \ 1 scan0363 | |
| Springing complaint related to weight distribution for chassis GAF-23, owned by Lady Guthrie. | 16th Sep 1935 | Box 106 \ 1 scan0364 | |
| Suspension complaints and a proposed modification to shock absorber valves. | 16th Sep 1935 | Box 106 \ 1 scan0365 | |
| Agreeing on the need for improvement to the springing on big Limousine bodies. | 17th Sep 1935 | Box 106 \ 1 scan0366 | |
| Analysis of springing on a 20/25 HP model, discussing weight distribution and ride quality. | 17th Sep 1935 | Box 106 \ 1 scan0367 | |
| Comparison of springing arrangements and ride comfort for different car bodies. | 17th Sep 1935 | Box 106 \ 1 scan0368 | |
| Postscript to a memo regarding 25HP springing, valuing the Repair Department's practical experience over technical arguments. | 17th Sep 1935 | Box 106 \ 1 scan0369 | |
| Car springing performance under varying load conditions. | 18th Sep 1935 | Box 106 \ 1 scan0370 | |
| Complexities of vehicle suspension springing in relation to variable loads. | 19th Sep 1935 | Box 106 \ 1 scan0371 | |
| Effect on a car's ride quality by adding weight to the luggage grid. | 19th Sep 1935 | Box 106 \ 1 scan0372 | |
| Spring clips and centre bolts for a 20/25 HP chassis, noting a discrepancy in part length. | 24th Sep 1935 | Box 106 \ 1 scan0373 | |
| Standardisation sheet for intermediate type road springs for continental use. | 14th Oct 1935 | Box 106 \ 1 scan0374 | |
| Cost estimation stating there is no charge for extra jigs, tools, and equipment for a special order. | 25th Sep 1935 | Box 106 \ 1 scan0375 | |
| Letter to a supplier regarding preliminary tests and a request for stress figures and drawings for 25 HP springs. | 1st Nov 1935 | Box 106 \ 1 scan0376 | |
| Letter concerning the stress range analysis of experimental road springs. | 4th Nov 1935 | Box 106 \ 1 scan0377 | |
| Continuation sheet of a letter from Thos. Firth & John Brown Ltd. regarding spring stresses. | 5th Nov 1935 | Box 106 \ 1 scan0378 | |
| Letter to a supplier regarding stress specifications for springs and requesting a drawing. | 5th Nov 1935 | Box 106 \ 1 scan0379 | |
| Response discussing the specifications and practicality of flexible road springs for a 20/25 HP vehicle. | 7th Nov 1935 | Box 106 \ 1 scan0380 | |
| Letter concerning stress calculations for a mainplate and flexible springs for a 20/25 HP car. | 7th Nov 1935 | Box 106 \ 1 scan0381 | |
| Oversteering issues on the 25 HP car, proposing to test a front anti-roll rod. | 7th Nov 1935 | Box 106 \ 1 scan0382 | |
| Letter concerning the supply of more flexible road springs for a 25 HP Chassis, enclosing print No. 172. | 11th Nov 1935 | Box 106 \ 1 scan0383 | |
| Letter to a supplier regarding the design of springs, suggesting a minor alteration to the bottom plates. | 12th Nov 1935 | Box 106 \ 1 scan0384 | |
| Test results for the deflection of front springs of a 20/25 model under braking torque. | 16th Dec 1935 | Box 106 \ 1 scan0385 | |
| Cost reduction proposal comparing the 20/25 HP Front Spring Rear Anchorage Brackets with a Bentley type alternative. | 19th Dec 1935 | Box 106 \ 1 scan0386 | |
| Requesting the production of two additional sets of front roll rod parts. | 21th Jan 1936 | Box 106 \ 1 scan0387 | |
| Cost reduction analysis for the 25-30 HP front spring rear anchorage brackets, comparing sheet metal parts to forgings. | 29th Jan 1936 | Box 106 \ 1 scan0388 | |
| Completion and fitting of two sets of 25 HP Front Roll Rods. | 4th Feb 1936 | Box 106 \ 1 scan0389 | |
| Blueprints for grooving the front spring plates on a 20/25 HP chassis. | 17th Feb 1936 | Box 106 \ 1 scan0390 | |
| Request to issue a covering order to Messrs. Firth for 2 car sets of 25 HP road springs. | 18th Feb 1936 | Box 106 \ 1 scan0391 | |
| Letter to Messrs. Thos. Firth & John Brown Ltd. ordering two more car sets of 25 HP road springs. | 18th Feb 1936 | Box 106 \ 1 scan0392 | |
| Letter from supplier Thos Firth & John Brown Ltd discussing the placement of clips on front and rear springs. | 21th Feb 1936 | Box 106 \ 1 scan0393 | |
| Letter to a spring supplier confirming changes to an order for 25 HP front springs. | 25th Feb 1936 | Box 106 \ 1 scan0394 | |
| Letter to supplier Messrs. Thos. Firth & John Brown Ltd. ordering a pair of front 25 HP special low rating springs. | 21th Apr 1936 | Box 106 \ 1 scan0395 | |
| Official order for a set of 25 HP front springs from Thos. Firth & John Brown Ltd. | 21th Apr 1936 | Box 106 \ 1 scan0396 | |
| Letter from a supplier acknowledging a request to produce a pair of special low rating springs. | 23th Apr 1936 | Box 106 \ 1 scan0397 | |
| Proposal for a front anti-roll rod for the 25/30 HP model. | 28th Apr 1936 | Box 106 \ 1 scan0398 | |
| Instructions for fitting a bracket to the lower flange of the frame. | 28th Apr 1936 | Box 106 \ 1 scan0399 | |
| Request for a covering order to be sent to Thos. Firth & John Brown Ltd. for fitting new plates to a pair of 25 HP road springs. | 7th May 1936 | Box 106 \ 1 scan0400 | |
| Sending one broken road spring to Firth's of Sheffield. | 7th May 1936 | Box 106 \ 1 scan0401 | |
| Letter to Thos. Firth & John Brown Ltd. confirming requirements for 25 HP and Bentley front springs. | 7th May 1936 | Box 106 \ 1 scan0402 | |
| Complaint of uncomfortable riding, with a query about the maximum permitted body overhang for chassis GU-34. | 25th Nov 1936 | Box 106 \ 1 scan0403 | |
| Blueprint of an enclosed limousine body showing side elevation, plan view, and key dimensions. | 18th Jun 1936 | Box 106 \ 1 scan0404 | |
| Evaluating the car's springing and ride quality, with proposals for improvement. | 21th Dec 1936 | Box 106 \ 1 scan0405 | |
| Series of springing and suspension road tests conducted at Cricklewood. | 21th Dec 1936 | Box 106 \ 1 scan0406 | |
| Road test report on vehicle suspension performance, detailing adjustments to dampers, roll bars, and tyre pressures. | 21th Dec 1936 | Box 106 \ 1 scan0407 | |
| Use of standard rear road springs with low-rated front springs to improve ride quality. | 24th Dec 1936 | Box 106 \ 1 scan0408 | |
| Comparison table of spring rate and buffer clearance data for Phantom III, 30 HP, and Bentley models. | 30th Dec 1936 | Box 106 \ 1 scan0409 | |
| Requesting the scrapping of 114 obsolete 25/30 normal type front springs from stores. | 30th Dec 1936 | Box 106 \ 1 scan0410 | |
| Failed experiment with rubber body mounting on a trials car and an inquiry into using rubber to reduce tyre noise on a 25/30 chassis. | 20th Apr 1937 | Box 106 \ 1 scan0411 | |
| Modifications required for fitting rubber between the axle and springs on a 30 HP model. | 29th Apr 1937 | Box 106 \ 1 scan0412 | |
| Design changes for a petrol tank, including the deletion of the ingoing filter and modifications to the sump and outgoing filter. | 11th Jun 1925 | Box 106 \ 2 scan0001 | |
| Petrol filtering precautions and refuelling methods for cars in France. | 10th Sep 1925 | Box 106 \ 2 scan0002 | |
| Abandoning the separate compartment petrol tank design in favour of a two-length suction pipe system. | 29th Sep 1925 | Box 106 \ 2 scan0003 | |
| Query regarding preparations to include new fittings, tested on the New Phantom, on the 20 HP petrol tank. | 18th Mar 1926 | Box 106 \ 2 scan0004 | |
| Issues with 20 HP petrol filters and proposing new filter system designs. | 3rd Jun 1926 | Box 106 \ 2 scan0005 | |
| Preparation of a 20 HP chassis for a 10,000-mile test and requesting a new petrol tank filler design. | 16th Jun 1926 | Box 106 \ 2 scan0006 | |
| Petrol tank filler for the 20 HP car, comparing it to the Phantom's. | 16th Jun 1926 | Box 106 \ 2 scan0007 | |
| Blueprint detailing the calibration measurements for a Goshawk petrol tank. | 25th Apr 1927 | Box 106 \ 2 scan0008 | |
| Internal memorandum discussing the selection of suitable wheels and tyres for the 20 HP model. | 25th Apr 1927 | Box 106 \ 2 scan0009 | |
| Query regarding an alteration to the rear tank for improved road clearance. | 5th May 1927 | Box 106 \ 2 scan0010 | |
| Insufficient road clearance on the 20 HP and 7-EX models experienced in France. | 5th May 1927 | Box 106 \ 2 scan0011 | |
| Implementation of an improved petrol tank and vertical shutters for the 20 HP chassis 'L' Series. | 17th Jun 1927 | Box 106 \ 2 scan0012 | |
| Standardisation of a new 20 HP petrol tank with reserve and filler. | 20th Jun 1927 | Box 106 \ 2 scan0013 | |
| Standardisation of a new petrol tank with a reserve and filler. | 23th May 1927 | Box 106 \ 2 scan0014 | |
| Cost summary report for testing the 'L' series chassis. | 8th Oct 1927 | Box 106 \ 2 scan0015 | |
| Leaflet for insertion into the 20 HP Chassis Instruction Book. | 28th Oct 1927 | Box 106 \ 2 scan0016 | |
| Instructions for the dashboard petrol filter and the petrol tank with reserve supply. | 1st Apr 1927 | Box 106 \ 2 scan0017 | |
| Instructions for cleaning and maintaining the petrol tank filters with a reserve supply, and a description of the dashboard petrol filter. | 26th Mar 1928 | Box 106 \ 2 scan0018 | |
| Urgency and specific improvements for the 'India 3' chassis over the 'EAC.10'. | 26th Mar 1928 | Box 106 \ 2 scan0019 | |
| Chassis development, parts procurement, and proposed modifications for testing. | 17th May 1928 | Box 106 \ 2 scan0020 | |
| Continued memorandum discussing the need for continuous improvement and the long lead times for implementation. | 22th May 1928 | Box 106 \ 2 scan0021 | |
| Modifications to the rear end of 'India 3 & 4' models, covering the petrol tank, wheel carrier, luggage grid, tail lamp, and exhaust. | 22th May 1928 | Box 106 \ 2 scan0022 | |
| Position of a 2-level device and recommending a shallower sump for the 20 HP model petrol tank. | 23th May 1928 | Box 106 \ 2 scan0023 | |
| Revised drawing for the 20-HP petrol tank to facilitate filter removal and confirming the design with coachbuilder Hoopers. | 6th Jun 1928 | Box 106 \ 2 scan0024 | |
| Proposed modification to a petrol filler cap for the 20-HP model. | 17th Jul 1928 | Box 106 \ 2 scan0025 | |
| Requesting an India-4 petrol tank for Claudel Hobsons to calibrate the petrol gauge. | 26th Oct 1928 | Box 106 \ 2 scan0026 | |
| Query regarding a modification to the 20 HP model's petrol tank cap and its locking device, contrasting it with the 'Phantom' model. | 1st Nov 1928 | Box 106 \ 2 scan0027 | |
| The design and function of the 20 HP petrol filler cap. | 28th Nov 1928 | Box 106 \ 2 scan0028 | |
| Letter to H.M. Hobson Ltd. regarding the fitting, calibration, and testing of two petrol tanks. | 13th Nov 1928 | Box 106 \ 2 scan0029 | |
| Letter to H.M. Hobson Ltd. sending a report on a 20 HP gauge and asking for assistance to improve its pumping. | 30th Nov 1928 | Box 106 \ 2 scan0030 | |
| Test report on the calibration and road performance of a Hobson K-S telegage (fuel gauge) fitted to a 20 HP chassis. | 30th Nov 1928 | Box 106 \ 2 scan0031 | |
| Second test on a petrol gauge, recording fuel level changes over distance. | 12th Dec 1929 | Box 106 \ 2 scan0032 | |
| Requesting an urgent order for a K-S Petrol Gauge with specific black figures on a cream background. | 12th Dec 1929 | Box 106 \ 2 scan0033 | |
| Request to provide a drawing of an India 1V Petrol Tank to Messrs. Hobson due to incorrectly placed air line connections. | 3rd Dec 1928 | Box 106 \ 2 scan0034 | |
| Removal of a petrol tank and the status of runningboard tool boxes. | 20th Dec 1928 | Box 106 \ 2 scan0035 | |
| | | | |