| Description | Date | Identifier | |
| Performance and potential improvements for an 'SS' carburetter. | 10th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan199 | |
| New valve springs and camshaft provisions for the 20HP engine. | 10th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan200 | |
| Technical memorandum discussing improvements for the 'SS' starter motor. | 10th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan201 | |
| Motor modifications, starter motor comparisons, and car damping adjustments. | 11th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan202 | |
| Improving steering by using hard rubber front engine mounts and a parallel moving front axle. | 11th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan203 | |
| Causes of and solutions for 'booming' and noisy car bodies, particularly limousines. | 12th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan204 | |
| Modifications to improve the lubrication of the 'SS' valve gear, including a sketch of a rocker. | 13th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan205 | |
| Wheel carrier arrangement for 'SS' cars, requesting the Derby coachwork department's assistance. | 14th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan206 | |
| System for carrying two wheels at the rear without luggage. | 14th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan207 | |
| List of suggested alterations for the 'SS' carburetter. | 15th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan208 | |
| Specification of fuse wire strands for the 'SS' electrical system. | 15th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan209 | |
| Accessory wiring, advising the use of single pole variety earthed to the chassis. | 15th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan210 | |
| Use of single versus twisted strands of 30 SWG fuse wire for an 'SS' electrical system. | 15th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan211 | |
| Accessory oil and water piping for the 'SS' engine, with reference to drawings LeCs. 2612/3/4. | 15th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan212 | |
| Use of single pole wiring for accessories, which must be earthed to the chassis by the coachbuilder. | 15th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan213 | |
| With queries regarding the front axle control damper and a request for a missing print. | 16th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan214 | |
| The proposed method for mounting front wing stays, headlamps, and number plates, specifically for car 18-EX. | 16th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan215 | |
| Modifications to the 'India 4' switchbox for a green lamp scheme. | 17th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan216 | |
| Engine dampers, crankshaft balance, and vibrations. | 17th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan217 | |
| Supply and specification of lamps for Mr. Royce's 18.EX car, including alternative options. | 19th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan218 | |
| Improvements to vehicle ride comfort by modifying springs, shock dampers, and reducing vibrations. | 19th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan219 | |
| Arrangements to test a freewheel with a cancelling clutch on a 20HP and an epicyclic third gear on EAC. 7. | 20th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan220 | |
| Proposing to offer the 20HP model with a 3-inch longer frame to prevent losing orders. | 20th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan221 | |
| Design of an 'SS' Axle Control Damper, focusing on air vents and valve passages. | 21th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan222 | |
| Issues with the dipping headlamps on the Barker Trials Car. | 21th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan223 | |
| Proposal to create a simple code word or number system for new steering column positions for easy telegraphic communication. | 21th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan224 | |
| Confidential memo discussing production strategy for the RRAI chassis and the necessity of halting older models. | 22th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan225 | |
| Inquiring about using copper-plating to prevent nitrifying hardening on specific parts, particularly the thread of valve gear cam followers. | 22th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan226 | |
| Accessory wiring, highlighting fire dangers and the decision to retain twin wiring. | 24th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan227 | |
| Experimental 'SS' crankshaft balance weights and an accompanying drawing for an engine test. | 24th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan228 | |
| New scheme for removing the 'SS' rear axle damper cap. | 24th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan229 | |
| Design and procurement of Lucas P.100 headlamps for models 19 & 20-EX. | 28th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan230 | |
| Specifications for accessories on a 19-EX Hooper Sedanca model. | 28th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan231 | |
| List of standard and additional accessories for a 20-EX Hooper Enclosed Limousine. | 28th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan232 | |
| With a sketch detailing a simplified throttle control linkage scheme for the 'India 4' project. | 29th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan233 | |
| Modifications to the valve plug and replenishing valve passage on the 'SS' rear axle damper. | 30th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan234 | |
| Specifications for front wings, headlamps, and wheel carriers for 'India 4' cars. | 30th Nov 1928 | West Wittering \ T \ 2July1928-December1928 Scan235 | |
| Potential design modifications for a front axle control damper lever, focusing on dimensions, materials, and stress points. | 28th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan236 | |
| Covering note for advance blueprints of the 20HP controls. | 1st Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan237 | |
| New scheme to allow for a single spare wheel to be carried at the rear. | 1st Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan238 | |
| The design and fitting of a single wheel carrier for chassis 14.G.4. | 3rd Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan239 | |
| Modifications and potential issues with the 'SS' Front Axle design. | 5th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan240 | |
| Delayed and feeble brakes, with a handwritten diagnosis of the likely cause. | 12th Jun 1928 | West Wittering \ T \ 2July1928-December1928 Scan241 | |
| Proposal for a strengthened 'I' section lever for the 'SS' Front Shock Damper to increase strength without adding weight. | 7th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan242 | |
| Collecting wings and step materials from Hooper's for cars 19-EX and 20-EX, and sending a scheme for valances. | 8th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan243 | |
| Instructing the dispatch of two identical subframes to the coachbuilders Hooper's and Barker's. | 8th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan244 | |
| Memo discussing vibrations in a central lamp and suggesting design modifications to the bracket and number plate. | 8th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan245 | |
| The required blade thicknesses for a feeler gauge for the SS unit. | 8th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan246 | |
| Required modifications for a sequence starter main switch. | 12th Aug 1928 | West Wittering \ T \ 2July1928-December1928 Scan247 | |
| Memo discussing vehicle testing strategy for various chassis models in preparation for an upcoming show. | 8th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan248 | |
| Vehicle testing mileage, noise reduction, starter sequencing, and a radiator support design with a diagram. | 9th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan249 | |
| Note regarding a temporary proposal for improving the 'SS' radiator support, referencing sketches from Mr. Royce. | 9th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan250 | |
| Blueprint detailing a modified radiator support with annotations. | 10th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan251 | |
| From 'E' confirming Mr. Royce's agreement on the accessory distribution board placement and proposing a design modification for the earth terminal. | 10th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan252 | |
| The SS starter, suggesting wiring it with a double pole push button switch. | 10th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan253 | |
| Final method for supporting the radiator and the necessary modifications. | 11th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan254 | |
| The difficulties of mounting a Hooper Sedanca body onto a 19-EX chassis due to fouling issues with the rear petrol tank. | 11th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan255 | |
| Fuel mixture distribution in the SS & G.4 induction pipe, considering the effects of speed and steam heating. | 11th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan256 | |
| Technical memorandum discussing potential modifications to a 'Green Light Scheme' unit to adjust its voltage operation. | 11th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan257 | |
| Design improvements and testing for the sequence starter mechanism. | 11th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan258 | |
| Solutions for poor fuel/air distribution at low temperature and high altitude, proposing methods to heat the air intake. | 12th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan259 | |
| Proposing to use Barker's to build a body for a close coupled coupe, noting their experience with Beatonson type convertible heads. | 12th Feb 1928 | West Wittering \ T \ 2July1928-December1928 Scan260 | |
| Sending drawing LeC. 2622, showing alternative induction pipes to cure distribution troubles. | 13th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan261 | |
| Confirming that spring lubrication is the next scheduled job. | 13th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan262 | |
| Suggestion to investigate the gearbox arrangement to resolve difficulty engaging the 'SS' reverse gear. | 17th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan263 | |
| Secret memo discussing a fault with the 'SS' gearbox when engaging the reverse gear. | 17th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan264 | |
| Causes and potential solutions for 'radiator shiver' vibrations on the 20HP and 'SS' models. | 17th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan265 | |
| The testing of a Stothert & Pitt patent rotary pump for oil pumping in car engines. | 17th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan266 | |
| Dispatch of drawings for a Hooper Pullman landaulet and its seating accommodation. | 18th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan267 | |
| Difficulties of fitting taper bolts for rubber engine feet and proposing an improved design. | 18th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan268 | |
| Design of a detachable subframe cross member and postponing production for EX-series cars. | 18th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan269 | |
| Requesting clarification on the servo operating cam angle (45° or 55°) for the Phantom model. | 18th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan270 | |
| Secret memo regarding the schedule for a Barker enclosed limousine body on a 'D' steering SS. chassis. | 18th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan271 | |
| Letter to a supplier regarding the design, testing, and issues with various vehicle lamps. | 18th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan272 | |
| List of accessories for the Barker Enclosed Limousine and Hooper Enclosed Landaulet models. | 18th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan273 | |
| Specification list of accessories for a Close Coupled All Weather car. | 18th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan274 | |
| Secret memo detailing instructions for fitting instruments and accessories to a 19-EX Hooper Sedanca. | 18th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan275 | |
| Engagement failures and potential fixes for the 'SS' starter. | 18th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan276 | |
| The engagement issues of starter motor gears and methods of chamfering. | 20th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan277 | |
| Page discussing the practical method of chamfering gear teeth to improve engagement. | 20th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan278 | |
| Methods and experiments for front spring lubrication. | 20th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan279 | |
| Camshaft design, valve lift curves, and practical considerations including floating speed and gas admission. | 20th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan280 | |
| And comparing the servo mechanisms for the Phantom and 20HP models, including details on cams and coefficients. | 21th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan281 | |
| Proposing design changes to a sequence starter for silent operation. | 21th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan282 | |
| Two blueprint designs for a starter carburetter throttle control and issues observed on the India 4 chassis. | 22th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan283 | |
| Secret memorandum comparing the 'SS' chassis with the Phantom and competitor vehicles, focusing on wheelbase, springs, and accessories. | 26th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan284 | |
| Chassis design changes, comparing a proposed 'SS' model to the Phantom, with a dimensional sketch. | 26th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan285 | |
| Proposal for an accumulator charge indicator using a green lamp scheme, including a circuit diagram. | 26th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan286 | |
| Radiator water leak and silencer issue following a 10,000-mile test. | 27th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan287 | |
| Secret internal memo regarding the design of the L.H. 'SS' gearbox and communication protocols. | 27th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan288 | |
| Secret internal memo regarding suggestions for freeing 'SS' clutch plates. | 29th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan289 | |
| Secret internal memo discussing difficulties and potential modifications to the 'SS' steering system. | 29th Dec 1928 | West Wittering \ T \ 2July1928-December1928 Scan290 | |
| Improvements and comparative testing for 'SS' cars, focusing on reducing resonance and noise. | 1st Jul 1929 | West Wittering \ T \ 2July1929-December1929 Scan001 | |
| Typed memo arranging a meeting at Bignalls Corner concerning 'SS' Cars. | 8th Jul 1929 | West Wittering \ T \ 2July1929-December1929 Scan002 | |
| Test results on different schemes for fabric couplings to improve their lifespan. | 4th Jul 1929 | West Wittering \ T \ 2July1929-December1929 Scan003 | |
| 50% greater life of a coupling using spigoted bolts compared to unspigoted bolts. | 4th Jul 1929 | West Wittering \ T \ 2July1929-December1929 Scan004 | |
| Cross-section drawing of a mechanical fastener assembly. | 5th Jul 1929 | West Wittering \ T \ 2July1929-December1929 Scan005 | |
| Archival stamp from the Print Room in Derby. | 5th Jul 1929 | West Wittering \ T \ 2July1929-December1929 Scan006 | |
| Blueprint showing different test configurations for a fabric coupling. | 21th Jul 1929 | West Wittering \ T \ 2July1929-December1929 Scan007 | |
| Stamped document from the Print Room in Derby. | 10th Jul 1929 | West Wittering \ T \ 2July1929-December1929 Scan008 | |
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