| Description | Date | Identifier | |
| Specification sheet comparing connecting rod and crank dimensions for Condor, 40/50 HP, and Goshawk engines. | 19th Jul 1923 | Box 74 \ 3 scan0281 | |
| Request to produce two experimental Goshawk II crankshafts instead of one. | 19th Oct 1923 | Box 74 \ 3 scan0282 | |
| Listing detail drawings for the Goshawk II experimental crankshaft and requesting production of two sets. | 1st Oct 1923 | Box 74 \ 3 scan0283 | |
| Faults and proposed solutions for the 20HP slipper drive. | 26th Oct 1923 | Box 74 \ 3 scan0284 | |
| Investigation into faulty crankshaft bearings on a 20-HP engine due to blocked oil ways from a deposit. | 6th Nov 1923 | Box 74 \ 3 scan0285 | |
| Experimental disc crank for a Goshawk engine, referencing the Hispano crankshaft and outlining proposed tests for new models. | 1st Jan 1924 | Box 74 \ 3 scan0286 | |
| Testing a disc crankshaft for a 20 HP engine, detailing vibrations, weight and performance. | 1st Feb 1924 | Box 74 \ 3 scan0287 | |
| Continued memorandum discussing the fitting of a damped spring drive to overcome an issue at full power. | 8th May 1924 | Box 74 \ 3 scan0288 | |
| Merits of a heavier disc crankshaft for an aero engine, proposing it could reduce flywheel weight and allow for a shorter, higher-speed engine. | 8th May 1924 | Box 74 \ 3 scan0289 | |
| Suggesting modifications to a damaged clutch plate and first motion shaft for experimental testing. | 27th Jun 1924 | Box 74 \ 3 scan0290 | |
| High speed vibrations in a 20 HP engine, comparing a disc crankshaft with a standard one. | 26th Sep 1924 | Box 74 \ 3 scan0291 | |
| Request for a blueprint and performance report on the Goshawk disc crankshaft. | 8th Oct 1924 | Box 74 \ 3 scan0292 | |
| Sending a blueprint for the Goshawk disc crankshaft and requesting a report on its experimental performance. | 10th Oct 1924 | Box 74 \ 3 scan0293 | |
| Modifications and performance of the 5-G-11 car, focusing on crankshaft vibration and steering. | 20th Oct 1924 | Box 74 \ 3 scan0294 | |
| Modifications to the pivot pin, steering box fixing, and silencer. | 20th Oct 1924 | Box 74 \ 3 scan0295 | |
| Results of tests on Aero Engine crankshafts, particularly the poor performance of a disc type. | 19th Nov 1924 | Box 74 \ 3 scan0296 | |
| Crankshaft design, bearing wear, and vibration issues in 20 HP cars. | 26th Nov 1924 | Box 74 \ 3 scan0297 | |
| Page two of a document discussing a stiffer crankshaft with modified pins and journals. | 3rd Dec 1924 | Box 74 \ 3 scan0298 | |
| From Hs. to E. regarding the dispatch of crankshaft blueprints. | 3rd Dec 1924 | Box 74 \ 3 scan0299 | |
| Tests conducted on a 20 HP crankshaft. | 23th Dec 1924 | Box 74 \ 3 scan0300 | |
| Tests conducted on 20 HP crankshafts. | 23th Dec 1924 | Box 74 \ 3 scan0301 | |
| Vibration tests on various shafts at different speeds and throttle conditions. | 23th Dec 1924 | Box 74 \ 3 scan0302 | |
| Stress testing a standard crankshaft to failure by towing a car. | 23th Dec 1924 | Box 74 \ 3 scan0303 | |
| Blueprint showing the position of a fracture on a Goshawk disk crankshaft. | 17th Dec 1924 | Box 74 \ 3 scan0304 | |
| Blueprint of a Standard Goshawk Crankshaft showing fracture locations. | 19th Dec 1928 | Box 74 \ 3 scan0305 | |
| Sketches of parts required to complete tests on a crankshaft vibration damper. | 28th Jun 1927 | Box 74 \ 3 scan0306 | |
| Requesting to fit a second crankshaft damper with improved plates and a larger flywheel onto a 20 HP test bed engine. | 15th Jul 1927 | Box 74 \ 3 scan0307 | |
| Excessive slack in cylinder valve stem guides and proposing reduced clearances. | 30th Nov 1920 | Box 74 \ 3 scan0308 | |
| Excessive play in engine valve guides on new cars and the associated costs of repair. | 29th Nov 1921 | Box 74 \ 3 scan0309 | |
| Excessive wear in valve guides on new cars, detailing a specific customer case and requesting authorisation for repair costs. | 18th Nov 1921 | Box 74 \ 3 scan0310 | |
| Wear on 40/50 valve guides and proposing the testing of valve guide bushes as a more economical repair method. | 1st Jan 1922 | Box 74 \ 3 scan0311 | |
| Proposal to address excessive wear on 40/50 valve guides by testing and standardizing replaceable valve guide bushes. | 1st Jan 1922 | Box 74 \ 3 scan0312 | |
| Relaying Mr. Royce's decision to reject a proposed alteration to the 40/50 chassis valve gear. | 1st Jan 1922 | Box 74 \ 3 scan0313 | |
| Reminder memo from C.J. to Hs. regarding the discontinuation and substitution of the 40/50 HP chassis. | 2nd Feb 1922 | Box 74 \ 3 scan0314 | |
| Correspondence on 40/50 HP valve guides. | 1st Feb 1922 | Box 74 \ 3 scan0315 | |
| Confirming Mr. Royce's agreement to trial replaceable valve guides on the 40/50 chassis for standardization. | 22th Feb 1922 | Box 74 \ 3 scan0316 | |
| Blueprints for an experiment with valve guide bushes for the 40/50 chassis. | 17th Mar 1922 | Box 74 \ 3 scan0317 | |
| Requesting a full report comparing the quality of post-war valves to pre-war valves. | 30th May 1922 | Box 74 \ 3 scan0318 | |
| Valve troubles in post-war cars, specifically addressing excessive wear, burnt valves, and potential causes. | 1st Jun 1922 | Box 74 \ 3 scan0319 | |
| The causes of valve wear in post-war cars and methods of lubrication. | 1st Jun 1922 | Box 74 \ 3 scan0320 | |
| Continued discussion on lubricating worn valves and guides, and introducing replaceable guides. | 1st Jun 1922 | Box 74 \ 3 scan0321 | |
| Valve troubles in post-war cars and a proposed scheme for lubricating valve guides. | 9th Jun 1922 | Box 74 \ 3 scan0322 | |
| Continued note on oil consumption at each valve. | 9th Jun 1922 | Box 74 \ 3 scan0323 | |
| Request to return a standardisation sheet for bushes for valve guides with the costs filled in. | 1st Aug 1922 | Box 74 \ 3 scan0324 | |
| Distribution memo for completed standardisation sheets regarding tyres, valve guides, and throttle. | 10th Oct 1922 | Box 74 \ 3 scan0325 | |
| Standardisation of chassis parts, specifically bushes for valve guides. | 3rd Jul 1922 | Box 74 \ 3 scan0326 | |
| Cost implications of changing valve guides from bar material to die-casting for the 40/50 HP Chassis. | 9th Aug 1922 | Box 74 \ 3 scan0327 | |
| Proposal for fitting detachable bushes for valve guides to address poor slow running on 40/50 engines. | 8th Aug 1922 | Box 74 \ 3 scan0328 | |
| Standardisation of replaceable valve guides and material experimentation. | 11th Nov 1922 | Box 74 \ 3 scan0329 | |
| Proposal to alter the valve guide clearance for the 40/50 chassis by modifying the diameter of the valve stems. | 5th Dec 1922 | Box 74 \ 3 scan0330 | |
| 40/50 chassis, instructing the reduction of valve guide bores to suit existing finished valves by producing a special undersize reamer. | 6th Dec 1922 | Box 74 \ 3 scan0331 | |
| Wear on valve stems and guides for the 40/50 model. | 9th May 1924 | Box 74 \ 3 scan0332 | |
| Valve stem issues with raw petrol and grit, proposing a new design for enclosing valves. | 2nd May 1924 | Box 74 \ 3 scan0333 | |
| Secret memo discussing wear on 40/50 valve guides and recommending a new enclosed design. | 2nd May 1924 | Box 74 \ 3 scan0334 | |
| Querying the adoption of enclosed valves for the 40/50 model, referencing the practice at the Springfield plant. | 13th May 1924 | Box 74 \ 3 scan0335 | |
| Wear on 40/50 HP valve guides and the potential adoption of new valve covers from the Springfield facility. | 13th May 1924 | Box 74 \ 3 scan0336 | |
| Urgency of addressing wear on 40/50 valve guides. | 15th May 1924 | Box 74 \ 3 scan0337 | |
| Wear on 40/50 HP valve guides and proposing to perform modifications at Derby to avoid delays. | 17th May 1924 | Box 74 \ 3 scan0338 | |
| Solutions for wear on valve stems and guides, including lapping, polishing, and adding covers. | 22th May 1924 | Box 74 \ 3 scan0339 | |
| Proposed schemes to address wear on exhaust valve guides. | 23th May 1924 | Box 74 \ 3 scan0340 | |
| Query about the progress of experiments on 40/50 HP valve guides and their potential standardization. | 18th Aug 1924 | Box 74 \ 3 scan0341 | |
| Standardisation of Chassis Parts regarding the use of Bronze Valve Guides in place of Cast Iron. | 21th Aug 1924 | Box 74 \ 3 scan0342 | |
| The comparative wear of Phosphor Bronze (P.B.) versus cast iron valve guides after 12,000 miles. | 21th Aug 1924 | Box 74 \ 3 scan0343 | |
| Examination report on the wear of valves and guides for a 98-NK car after a 10,000-mile test. | 20th Aug 1924 | Box 74 \ 3 scan0344 | |
| Progress on adopting new valve covers for 40/50 HP valve guides. | 23th Sep 1924 | Box 74 \ 3 scan0345 | |
| The wear of 40/50 HP valve guides and the standardisation of bronze guides to replace cast iron ones. | 24th Sep 1924 | Box 74 \ 3 scan0346 | |
| Letter from Katalite Corporation regarding the application and performance of their product on car engines. | 22th Mar 1923 | Box 74 \ 3 scan0347 | |
| Letter from Katalite Corporation discussing tests and the potential application of their catalysed cylinder head to Rolls-Royce engines. | 22th Mar 1923 | Box 74 \ 3 scan0348 | |
| Testimonial letter from Westinghouse Electric International Company regarding the improved performance of trucks treated with Katalite. | 14th Oct 1922 | Box 74 \ 3 scan0349 | |
| Testimonial letter to The Katalite Corporation about the performance of a Katalizer device in a Pierce Arrow Limosine. | 14th Oct 1922 | Box 74 \ 3 scan0350 | |
| Testimonial letter from an automobile distributor detailing performance improvements on a Velie touring car after using a catalytic agent. | 6th Mar 1923 | Box 74 \ 3 scan0351 | |
| Advertisement for 'Katalite', a chemical agent claiming to maximize motor fuel efficiency. | 30th Dec 1922 | Box 74 \ 3 scan0352 | |
| Letter from the Springfield Gas Light Company to the Katalite Company regarding equipping their entire fleet of vehicles with a catalytic agent. | 30th Dec 1922 | Box 74 \ 3 scan0353 | |
| Promotional leaflet explaining the benefits of the fuel additive 'Katalite' for engine performance. | 30th Dec 1922 | Box 74 \ 3 scan0354 | |
| Promotional document explaining the benefits and application of KATALITE, a catalytic agent for improving engine combustion. | 30th Dec 1922 | Box 74 \ 3 scan0355 | |
| Promotional document for a chemical engine treatment called KATALITE. | 6th Feb 1923 | Box 74 \ 3 scan0356 | |
| Report reprinted from the Newark Star-Eagle newspaper on increased gasoline mileage in a Dodge vehicle after cylinder head treatment with 'Katalite'. | 6th Feb 1923 | Box 74 \ 3 scan0357 | |
| 'Katalite', enclosing a copy of document Oy1/E/22724 and four charts. | 10th Mar 1924 | Box 74 \ 3 scan0358 | |
| Letter discussing Dr. Sokal's catalysing process for engine cylinders and a proposal for further testing. | 27th Feb 1924 | Box 74 \ 3 scan0359 | |
| The effectiveness of a catalyser, its maintenance regarding carbon build-up, and its benefits with a Ricardo head. | 27th Feb 1924 | Box 74 \ 3 scan0360 | |
| Letter from Katalite Corporation to Mr. M. Olley discussing the use of Katalite to counteract engine detonation, referencing enclosed test data. | 21th Feb 1924 | Box 74 \ 3 scan0361 | |
| Letter to Mr. M. Olley discussing test results on fuel consumption, cylinder heads, detonation and spark advance, with a focus on a treatment called 'Katalite'. | 21th Feb 1924 | Box 74 \ 3 scan0362 | |
| Letter from Locomobile Company of America introducing Dr. Sokal and his work on a catalytic agent called Katalite. | 27th Dec 1923 | Box 74 \ 3 scan0363 | |
| Material 'Katalite' following a visit to America and information gathered in New York. | 14th Mar 1924 | Box 74 \ 3 scan0364 | |
| Letter discussing Dr. Sokal's catalysing process for engine cylinders and proposed testing. | 27th Feb 1924 | Box 74 \ 3 scan0365 | |
| Effects of a catalyser on engine performance, carbon build-up, and fuel economy. | 27th Feb 1924 | Box 74 \ 3 scan0366 | |
| Letter from Katalite Corporation regarding developments in counteracting detonation with 'Katalite', including test results. | 21th Feb 1924 | Box 74 \ 3 scan0367 | |
| Letter from Edward Sokal to Mr. M. Olley discussing engine tests and performance improvements using 'Katalite'. | 21th Feb 1924 | Box 74 \ 3 scan0368 | |
| Letter from the Locomobile Company of America introducing Dr. Sokal and his work on a catalytic agent named Katalite. | 27th Dec 1923 | Box 74 \ 3 scan0369 | |
| Graph comparing fuel consumption at full throttle for an untreated versus a 'Katalited' Ricardo head. | 12th Nov 1923 | Box 74 \ 3 scan0370 | |
| Graph comparing fuel consumption of an untreated versus a 'Katalited' Ricardo head at part throttle. | 12th Nov 1923 | Box 74 \ 3 scan0371 | |
| Dynamometer test results graph comparing a 'Katalited' cylinder head against an untreated one. | 3rd Dec 1923 | Box 74 \ 3 scan0372 | |
| Dynamometer test graph from The Locomobile Co. of America for an engine with a Ricardo cylinder head. | 14th Nov 1923 | Box 74 \ 3 scan0373 | |
| Inquiry from the US office to the UK office regarding the Katalite process and a treated Hupmobile. | 30th Jun 1923 | Box 74 \ 3 scan0374 | |
| Letter discussing the 'Katalite' process, its performance, disadvantages, and comparison to doped fuel. | 31th Jul 1923 | Box 74 \ 3 scan0375 | |
| Covering memo regarding 'Katalite', attaching a copy of document Oy6-E-51624 and its enclosures. | 26th May 1924 | Box 74 \ 3 scan0376 | |
| Letter discussing the experimental use and adoption of Katalite fuel treatment, suggesting its trial on aero engines. | 16th May 1924 | Box 74 \ 3 scan0377 | |
| Letter from American Katalite Corporation regarding evidence of Katalite's effect on counteracting detonation in high compression engines. | 21th Apr 1924 | Box 74 \ 3 scan0378 | |
| Letter to the Chief Engineer of Willys-Overland Company discussing experiments with a substance called Katalite to counteract engine detonation. | 14th Apr 1924 | Box 74 \ 3 scan0379 | |
| Letter discussing the chemical phenomenon of detonation in engines, comparing fuel stratification with a 'Katalite' catalytic coating. | 14th Apr 1924 | Box 74 \ 3 scan0380 | |
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