| Description | Date | Identifier | |
| Performance table comparing various bonnet ventilation configurations at different speeds. | 25th Nov 1924 | Box 22 \ 1 Scan219 | |
| Comparative analysis of cooling system performance for Hispano and 40/50 models under various conditions. | 25th Nov 1924 | Box 22 \ 1 Scan220 | |
| Test data tables on the cooling efficiency of a 40/50 HP engine, examining the effects of speed, matrix/shutter configuration, and fuel mixture strength. | 17th Feb 1925 | Box 22 \ 1 Scan221 | |
| Comparing EAC and Hispano steering systems and providing a status update on various car projects. | 17th Feb 1925 | Box 22 \ 1 Scan222 | |
| Comparison of steering effort for a 93NK chassis versus a Hispano Suiza chassis. | 16th Feb 1925 | Box 22 \ 1 Scan223 | |
| The heavy steering issue in the E.A.C. 'V' series car, comparing it with the 40/50 and Hispano models. | 13th Mar 1925 | Box 22 \ 1 Scan224 | |
| Comparing the steering effort and components of Hispano and EAC cars against the 40/50 model. | 3rd Mar 1925 | Box 22 \ 1 Scan225 | |
| Secret internal memorandum discussing the difference in 'V' series steering and the effect of weight lifting. | 18th Mar 1925 | Box 22 \ 1 Scan226 | |
| Secret memorandum discussing heavy steering issues, comparing steering box types, and proposing various solutions. | 23th Mar 1925 | Box 22 \ 1 Scan227 | |
| Continued memo discussing design options for a pendulum lever shaft and associated components. | 26th Mar 1925 | Box 22 \ 1 Scan228 | |
| Graph showing the load in the side steering tube against tyre pressure for a Hispano-Suiza steering system. | 26th Mar 1925 | Box 22 \ 1 Scan229 | |
| Comparison of steering leverage between the E.A.C.V Series and Hispano steering systems. | 26th Mar 1925 | Box 22 \ 1 Scan230 | |
| Road tests for the Hispano steering system, measuring loads in the steering tube during turns. | 26th Mar 1925 | Box 22 \ 1 Scan231 | |
| List of required files, detailing reference numbers and their corresponding subject matter. | 26th Mar 1925 | Box 22 \ 1 Scan232 | |
| List of various engine components with associated part and reference numbers. | 26th Mar 1925 | Box 22 \ 1 Scan233 | |
| Reverse of a photograph identifying a key plan for an engine. | 26th Mar 1925 | Box 22 \ 1 Scan234 | |
| List of parts and reference numbers taken to a location named Clan on a Monday. | 1st Apr 1925 | Box 22 \ 1 Scan235 | |
| 'EAC' steering, detailing the force required to make turns at speed compared to other models. | 1st Apr 1925 | Box 22 \ 1 Scan236 | |
| Comparing steering effort in lbs for left and right turns on various car models with different tyre pressures and axle weights. | 6th Apr 1925 | Box 22 \ 1 Scan237 | |
| Tests conducted to address heavy and unstable steering issues. | 25th Sep 1924 | Box 22 \ 1 Scan238 | |
| Steering efficiency, wear, and leverage. | 6th Apr 1925 | Box 22 \ 1 Scan239 | |
| Graph showing the percentage increase of leverage for Hispano steering relative to the E.A.C. V series. | 8th Mar 1928 | Box 22 \ 1 Scan240 | |
| Graph showing the experimental results of Hispano-Suiza steering leverage. | 6th Apr 1928 | Box 22 \ 1 Scan241 | |
| Graph of steering leverage versus steering wheel rotation for the E.A.C. V series. | 6th Apr 1925 | Box 22 \ 1 Scan242 | |
| Design, performance issues, and potential improvements for the 'V' Series steering system. | 15th Apr 1925 | Box 22 \ 1 Scan243 | |
| Technical note on steering geometry, specifically addressing leverage on the L.H. lock. | 14th May 1925 | Box 22 \ 1 Scan244 | |
| Vehicle overheating complaint and the value of historical test data. | 14th May 1925 | Box 22 \ 1 Scan245 | |
| Cooling test methods and the reasons for abandoning louvered bonnets. | 14th May 1925 | Box 22 \ 1 Scan246 | |
| Engine overheating, analysing the effects of fan belt tension and gear selection when hill climbing. | 14th May 1925 | Box 22 \ 1 Scan247 | |
| Potential reasons for a car overheating due to a different driving method. | 14th May 1925 | Box 22 \ 1 Scan248 | |
| Chart comparing overheating test results for the Silver Ghost and Hispano Suiza models. | 14th May 1925 | Box 22 \ 1 Scan249 | |
| Arrangement diagram for a Hispano-Suiza steering box in a car. | 24th Jan 1918 | Box 22 \ 1 Scan250 | |
| Confirming a verbal arrangement to adapt batteries for a Hispano car. | 20th Jun 1925 | Box 22 \ 1 Scan251 | |
| Comparing their steering system with Hispano's and discussing potential improvements. | 29th Jun 1925 | Box 22 \ 1 Scan252 | |
| Steering system improvements, including a new pendulum lever design and competitor analysis. | 7th Jul 1925 | Box 22 \ 1 Scan253 | |
| Quarterly note regarding the disposal of Hispano and Mercedes cars from the Experimental Department. | 7th Jul 1925 | Box 22 \ 1 Scan254 | |
| Cross-sectional drawing of a Hispano type side steering tube with dimensions and load specifications. | 8th Jul 1925 | Box 22 \ 1 Scan255 | |
| Explaining the continued use of Hispano and Mercedes cars for experimental purposes. | 8th Jul 1925 | Box 22 \ 1 Scan256 | |
| Technical memorandum discussing different steering gear designs, including irreversible boxes and the Marles system. | 10th Jul 1925 | Box 22 \ 1 Scan257 | |
| The disapproval of bonnet louvres on Mr. Royce's car and a request for new drawings. | 14th Jul 1925 | Box 22 \ 1 Scan258 | |
| Request to determine the instantaneous steering leverage on a Hispano car at full left-hand lock. | 6th Jul 1925 | Box 22 \ 1 Scan259 | |
| Investigating and damping low and high speed steering wobbles. | 17th Jul 1925 | Box 22 \ 1 Scan260 | |
| Steering oscillation, the effect of a damped pendulum lever, and weak buffer springs. | 17th Jul 1925 | Box 22 \ 1 Scan261 | |
| Graph chart recording of a battery discharge test with handwritten calculations. | 22th Jul 1925 | Box 22 \ 1 Scan262 | |
| Design and fitment of bonnet louvres for the New Phantom model. | 25th Aug 1925 | Box 22 \ 1 Scan263 | |
| The discharge tests performed on a Hispano Suiza battery. | 13th Aug 1925 | Box 22 \ 1 Scan264 | |
| Instruction sheet noting a battery is in good condition and ready to be refitted. | 5th Dec 1922 | Box 22 \ 1 Scan265 | |
| Requesting information on the maximum distance between the wheel contact point and pivot for a new, lighter front axle design. | 1st Sep 1925 | Box 22 \ 1 Scan266 | |
| High-speed steering wobbles in a Hispano Suiza vehicle. | 10th Sep 1925 | Box 22 \ 1 Scan267 | |
| High-speed steering wobbles, comparing tests on a Hispano car with a Phantom. | 11th Sep 1925 | Box 22 \ 1 Scan268 | |
| Investigating high-speed wobbles by comparing a Hispano car to an EAC and testing steering modifications. | 14th Sep 1925 | Box 22 \ 1 Scan269 | |
| Investigating wheel wobble using a dynamometer and chronograph. | 14th Sep 1925 | Box 22 \ 1 Scan270 | |
| Comparing the weights of front axle and brake components. | 17th Sep 1925 | Box 22 \ 1 Scan271 | |
| Page 2, comparing the weights of hub and wheel components for different models. | 9th Sep 1925 | Box 22 \ 1 Scan272 | |
| Design and effectiveness of a louvered bonnet compared to shutters. | 1st Sep 1925 | Box 22 \ 1 Scan273 | |
| Problems with Autovac tanks, suggesting modifications, and requesting further designs. | 28th Sep 1925 | Box 22 \ 1 Scan274 | |
| Urgent order request for searchlight lamps to be used on a Hispano-Suiza car. | 19th Jan 1926 | Box 22 \ 1 Scan275 | |
| Four broad improvements made to the New Phantom steering system. | 4th Mar 1926 | Box 22 \ 1 Scan276 | |
| Improvements to a worm and nut mechanism, including lubrication, thread design, and comparison to a Hispano model. | 17th Apr 1926 | Box 22 \ 1 Scan277 | |
| Technical memorandum discussing the design, performance, and potential improvements of the E.A.C. steering system. | 17th Apr 1926 | Box 22 \ 1 Scan278 | |
| Urgent internal request to order searchlight lamps for a Hispano car. | 30th Sep 1926 | Box 22 \ 1 Scan279 | |
| To the Pattern Shop requesting a new battery box for an experimental Hispano chassis. | 4th Jan 1927 | Box 22 \ 1 Scan280 | |
| Engine detonations on a Hispano engine. | 25th Jan 1927 | Box 22 \ 1 Scan281 | |
| Request to the Pattern Shop to make a new battery box for an experimental Hispano chassis. | 25th Feb 1927 | Box 22 \ 1 Scan282 | |
| Tests and observations on high-speed wobbles, particularly the ineffectiveness of front shock dampers under certain tyre conditions. | 14th Jun 1927 | Box 22 \ 1 Scan283 | |
| Results of tests on vehicle wobble, frame twisting, and the effects of engine mass, inertia, and shock dampers. | 14th Jun 1927 | Box 22 \ 1 Scan284 | |
| Test report page comparing oscillation and wobble characteristics between an EAC.V11 and a Hispano car. | 14th Jun 1927 | Box 22 \ 1 Scan285 | |
| Methods to eliminate high-speed wobbles by adjusting front and rear dampers and frame stiffness. | 14th Jun 1927 | Box 22 \ 1 Scan286 | |
| Blueprint graph and diagrams illustrating frame rigidity and periodicity tests. | 5th Jul 1927 | Box 22 \ 1 Scan287 | |
| Instruction memo regarding work to be carried out on a Hispano-Suiza car by Sanderson & Holmes Ltd. | 5th Jul 1927 | Box 22 \ 1 Scan288 | |
| Correction regarding the torsional stiffness of the Hispano frame compared to the 40/50 model in relation to high-speed wobbles. | 11th Jul 1927 | Box 22 \ 1 Scan289 | |
| Return of a re-painted Hispano Suiza car for selling purposes. | 1st Aug 1927 | Box 22 \ 1 Scan290 | |
| Short internal memo acknowledging the contents of a communication regarding a Hispano Suiza car. | 1st Sep 1927 | Box 22 \ 1 Scan291 | |
| Design characteristics of 'Straight Eight' and 'Hispano Six' engines. | 7th Sep 1927 | Box 22 \ 1 Scan292 | |
| Inquiry regarding the expected arrival of a Hispano Suiza car for sale. | 21th Sep 1927 | Box 22 \ 1 Scan293 | |
| Delay in sending a Hispano Suiza car due to engine experiments. | 22th Sep 1927 | Box 22 \ 1 Scan294 | |
| Report comparing the weight of tubular section connecting rods and piston assemblies of Rolls Royce, Hispano, and Lorraine cars. | 18th Oct 1927 | Box 22 \ 1 Scan295 | |
| Comparison table of engine component specifications for 20 HP, Lorraine, 40/50 HP, and Hispano models. | 1st Nov 1927 | Box 22 \ 1 Scan296 | |
| Instruction to Lillie Hall to receive one Hispano Suiza car for the Sales Department. | 1st Nov 1927 | Box 22 \ 1 Scan297 | |
| Sending a Hispano car to Lillie Hall to be sold. | 11th Nov 1927 | Box 22 \ 1 Scan298 | |
| Receiving a Hispano Suiza car for the Sales Department, with a handwritten note of receipt and a fault. | 1st Nov 1927 | Box 22 \ 1 Scan299 | |
| Technical discussion on the design of the EAC.10 induction pipe and cylinder head, comparing 4-port and 6-port arrangements. | 17th Jan 1928 | Box 22 \ 1 Scan300 | |
| Page discussing the use of an undertype slot for 4 or 6 port induction pipes, referencing blueprint LeC.2509. | 17th Jan 1928 | Box 22 \ 1 Scan301 | |
| Valve lift diagrams, formulas, and clearances for car and aero engines. | 17th Jan 1928 | Box 22 \ 1 Scan302 | |
| Improvements to the Phantom steering system, including customer feedback and comparisons with other cars. | 1st Apr 1928 | Box 22 \ 1 Scan303 | |
| Steering characteristics, skid correction, parking, and comparisons between different car models. | 25th Apr 1928 | Box 22 \ 1 Scan304 | |
| Improvements for the 'Phantom' steering system, comparing it to Hispano-Suiza steering and suggesting hydraulic damping. | 25th Apr 1928 | Box 22 \ 1 Scan305 | |
| Offer from Solex to test their carburetters. | 28th Apr 1928 | Box 22 \ 1 Scan306 | |
| Inquiry regarding a tyre inflation pump for the Phantom model. | 7th Jun 1928 | Box 22 \ 1 Scan307 | |
| The nitrogenisation of steel process for crankshafts and cylinders observed at the Hispano Works. | 1st Oct 1928 | Box 22 \ 1 Scan308 | |
| The nitrogen hardening process observed at the Aubert & Duval plant, detailing its application on automotive and aero parts. | 1st Oct 1928 | Box 22 \ 1 Scan309 | |
| Cheap and simple steel hardening process, its benefits over case-hardening, and potential collaboration with French and British partners. | 31th Dec 1928 | Box 22 \ 1 Scan310 | |
| Sample of a French Hispano cylinder made with a nitrided alloy, sent for comparative testing. | 31th Dec 1928 | Box 22 \ 1 Scan311 | |
| Confirming that cylinder liners were ground after hardening to remove the brittle surface. | 1st Jan 1929 | Box 22 \ 1 Scan312 | |
| Brittle surface layer on nitro alloy steel and the necessity of grinding after nitriding. | 4th Feb 1929 | Box 22 \ 1 Scan313 | |
| Letter from Aubert & Duval discussing the grinding of nitro-hardened steel components. | 20th Aug 1923 | Box 22 \ 1 Scan314 | |
| Visit by Sir Henry Seagrave with a new Hispano Suiza 'Barcelona' model, detailing its specifications and a test run comparison. | 20th Aug 1923 | Box 22 \ 1 Scan315 | |
| Test report assessing a car's acceleration, maximum speed, steering, and braking characteristics. | 20th Aug 1923 | Box 22 \ 1 Scan316 | |
| Summary of test results comparing a Hispano sports car to a modified Continental Phantom, focusing on braking and overall performance. | 19th Jul 1930 | Box 22 \ 1 Scan317 | |
| Letter to Capt. Owen of Jack Barclay & Co. Ltd., comparing the cooling of a 'Hispano' car with the Phantom II and inviting him to the works. | 19th Jul 1930 | Box 22 \ 1 Scan318 | |
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