| Description | Date | Identifier | |
| Potential engine improvements and design changes for a 20 HP Phantom scheme. | 28th Feb 1928 | Box 5 \ 4 04-page196 | |
| Design schemes and specifications for the India 3 engine. | 21th Mar 1928 | Box 5 \ 4 04-page197 | |
| Competitive pressures from Buick and Sunbeam, and outlining necessary engineering improvements for the 20 HP model. | 27th Mar 1928 | Box 5 \ 4 04-page198 | |
| Underfed type of induction pipe for the India 3 model, referencing blueprint Lec. 2543. | 1st Apr 1928 | Box 5 \ 4 04-page199 | |
| With a diagram discussing an alternative design for an induction pipe feed. | 4th Jul 1928 | Box 5 \ 4 04-page200 | |
| Design of induction pipes and a carburettor for the India 3 model, comparing it to the 'SS' Phantom. | 1st Apr 1928 | Box 5 \ 4 04-page201 | |
| Contingency plan for a new carburettor, proposing an alternative using an over-fed slot pipe. | 21th Jun 1928 | Box 5 \ 4 04-page202 | |
| Design and adaptation of an induction pipe for the India 3 project, referencing drawing Lec.2371. | 4th Jul 1928 | Box 5 \ 4 04-page203 | |
| Short memorandum regarding the positioning of jets in the 20 HP and 40/50 HP carburetters. | 20th Jul 1928 | Box 5 \ 4 04-page204 | |
| Clarifying a proposed alteration to the 20 HP carburetter's choke and jet passage-way. | 25th Jul 1928 | Box 5 \ 4 04-page205 | |
| Modifications to the 20 HP mixture adjustment lever to resolve a running issue. | 24th Aug 1928 | Box 5 \ 4 04-page206 | |
| The poor slow running of the 20 HP engine, proposing a test with a Zenith carburetter. | 1st Aug 1928 | Box 5 \ 4 04-page207 | |
| Follow-up memo on a half-finished drawing for carburetor alterations for the 20 HP model. | 26th Oct 1928 | Box 5 \ 4 04-page208 | |
| With a sketch detailing a simplified throttle control scheme for the 'India 4' model. | 29th Nov 1928 | Box 5 \ 4 04-page209 | |
| Advance blueprints for 20 HP. controls. | 1st Dec 1928 | Box 5 \ 4 04-page210 | |
| Design improvements and various ideas for carburation. | 1st Feb 1929 | Box 5 \ 4 04-page211 | |
| Customer's difficulty in dismantling a carburettor jet on a 20 HP car, proposing a design improvement. | 21th Apr 1929 | Box 5 \ 4 04-page212 | |
| Potential engine and chassis improvements for a new car model. | 27th Apr 1929 | Box 5 \ 4 04-page213 | |
| Sales management, performance, testing, and a specific gearbox fault observed on a customer's car. | 29th Apr 1929 | Box 5 \ 4 04-page214 | |
| Technical memorandum on carburettor settings and performance on experimental larger bore 20 HP engines. | 29th Apr 1929 | Box 5 \ 4 04-page215 | |
| Specification sheet for two experimental 20 HP engines, one with an aluminum turbulent head and the other a modified cast iron standard head. | 2nd May 1929 | Box 5 \ 4 04-page216 | |
| Change in throttle valve and venturi passageway diameter for the 20 HP carburetter. | 2nd May 1929 | Box 5 \ 4 04-page217 | |
| Wire from Royce requesting a car for an election and the return of another car with carburetter modifications. | 25th May 1929 | Box 5 \ 4 04-page218 | |
| 'S.S. Hot Spot Experiments' and the '20 HP Programme'. | 16th Oct 1929 | Box 5 \ 4 04-page219 | |
| Outlining proposed engine modifications and testing procedures. | 11th Nov 1929 | Box 5 \ 4 04-page220 | |
| Lighter air valve for a 20 HP carburetter. | 11th Nov 1929 | Box 5 \ 4 04-page221 | |
| Air temperature readings taken at the carburettor intake under normal running conditions. | 29th Nov 1929 | Box 5 \ 4 04-page222 | |
| Requesting instructions for building a copper induction pipe to test a single Stromberg carburetter against a twin carburetter system for 'Japan'. | 29th Nov 1929 | Box 5 \ 4 04-page223 | |
| Proposed scheme for improvements in carburetter design. | 13th Dec 1929 | Box 5 \ 4 04-page224 | |
| Technical description of different carburetter arrangements and their operational principles. | 13th Dec 1929 | Box 5 \ 4 04-page225 | |
| Page 3 of a memo regarding an air valve, a restrictor needle, and a carburetter drawing. | 4th Dec 1929 | Box 5 \ 4 04-page226 | |
| First drawing of a new expanding carburetter design based on a recent patent. | 4th Dec 1929 | Box 5 \ 4 04-page227 | |
| Tests comparing a single carburetter with a two-branch induction pipe against a dual carburetter system on a 'Japan' engine. | 28th Dec 1929 | Box 5 \ 4 04-page228 | |
| Comparison of single versus twin carburettor systems and their performance characteristics on a Phantom model. | 24th Dec 1929 | Box 5 \ 4 04-page229 | |
| Performance graph comparing two different induction pipe and carburettor setups for Engine No. 176.S-8. | 24th Dec 1929 | Box 5 \ 4 04-page230 | |
| Diagrams from tests of various induction pipe configurations for the JAP.VN. engine. | 2nd Dec 1923 | Box 5 \ 4 04-page231 | |
| The trial of a twin choke Zenith carburetter on the 20 HP 'Japan' engine. | 30th Jan 1930 | Box 5 \ 4 04-page232 | |
| Suggested programme for 20 HP twin carburetter tests. | 24th Apr 1930 | Box 5 \ 4 04-page233 | |
| Carburetter design choices for 6-cylinder engines and the Phantom II. | 5th May 1930 | Box 5 \ 4 04-page234 | |
| Twin carburettor tests and camshaft comparisons for the 'Japan' engine. | 23th May 1930 | Box 5 \ 4 04-page235 | |
| Engine tests comparing different riser pipe and choke sizes for power output and efficiency. | 23th May 1930 | Box 5 \ 4 04-page236 | |
| Engine testing, comparing performance with different camshaft durations and carburetter configurations. | 23th May 1930 | Box 5 \ 4 04-page237 | |
| Summary of engine experiment results on 'Japan' concerning carburettors, camshafts, and induction systems. | 23th May 1930 | Box 5 \ 4 04-page238 | |
| Table of actual valve timing data taken on an engine with a .020 Tappet Clearance. | 27th May 1918 | Box 5 \ 4 04-page239 | |
| Performance graph comparing large and small bore induction manifolds on a 'Japan' engine with twin Zenith carburettors. | 28th Nov 1930 | Box 5 \ 4 04-page240 | |
| Performance graph comparing different camshaft configurations on the 'Japan' engine model. | 28th Nov 1930 | Box 5 \ 4 04-page241 | |
| Performance graph comparing a Twin Zenith carburettor against a standard chassis carburettor with different camshafts. | 21th Jun 1939 | Box 5 \ 4 04-page242 | |
| Blueprint for the arrangement of twin Zenith carburettors and induction pipes on a Japan engine. | 27th May 1931 | Box 5 \ 4 04-page243 | |
| Report comparing the road test performance of Twin Zenith and Solex carburetters on different engines. | 11th Jun 1930 | Box 5 \ 4 04-page244 | |
| Carburettor design, comparing emulsion type diffusers with plain tube jets and the need for an acceleration pump. | 1st Jun 1932 | Box 5 \ 4 04-page245 | |
| Carburetor testing, comparing Zenith and Stromberg models and discussing road test results on a Phantom. | 1st Jun 1932 | Box 5 \ 4 04-page246 | |
| Diagrammatic sketch of a Stutz-Zenith carburettor. | 7th Jun 1940 | Box 5 \ 4 04-page247 | |
| Visit to WV, a 25HP chassis, and design progress on the Phantom II induction system and petrol pump. | 9th Jul 1930 | Box 5 \ 4 04-page248 | |
| Increasing petrol consumption, suggesting bench tests to investigate carburation issues. | 10th Jul 1930 | Box 5 \ 4 04-page249 | |
| Test drive report on a 25 HP car with a double Zenith carburetter. | 9th Jul 1930 | Box 5 \ 4 04-page250 | |
| Whether increased acceleration on a Phantom II car was due to a drilled air-valve or advanced ignition timing. | 28th Jul 1930 | Box 5 \ 4 04-page251 | |
| Brake thumping and carburation issues for a 25 HP car (Japan model). | 20th Aug 1930 | Box 5 \ 4 04-page252 | |
| High engine oil consumption and potential remedies, including increasing the oil reserve. | 21th Sep 1930 | Box 5 \ 4 04-page253 | |
| Brake issues, crankchamber modifications, and testing for the 25 HP model for Japan. | 21th Sep 1930 | Box 5 \ 4 04-page254 | |
| 25 HP car in Japan, addressing a brake failure and an experiment with extra oil. | 8th Sep 1930 | Box 5 \ 4 04-page255 | |
| Requesting the development of an air silencer for the 20/25 HP carburetter. | 25th Oct 1930 | Box 5 \ 4 04-page256 | |
| Thermostat temperature settings, carburation imperfections, and twin carburetors for 25HP and 45HP cars. | 1st Dec 1930 | Box 5 \ 4 04-page257 | |
| Carburettor noise on the Phantom II and a proposal to use the crankcase as a silencer. | 20th Dec 1930 | Box 5 \ 4 04-page258 | |
| Oil retention issue with the Universal Joint and a suggested design improvement for the end caps. | 29th Sep 1911 | Box 5 \ 5 05-page01 | |
| From the Technical Committee regarding developments for a Universal Joint and Clutches. | 16th Oct 1911 | Box 5 \ 5 05-page02 | |
| Experimental log for an oil-retaining clutch coupling. | 17th Oct 1911 | Box 5 \ 5 05-page03 | |
| To standardize the maximum load on springs. | 10th Sep 1912 | Box 5 \ 5 05-page04 | |
| Redesign of the coupling between the engine and gearbox to reduce over-running noise. | 17th Nov 1911 | Box 5 \ 5 05-page05 | |
| Engine induction pipe pressure and its effect on a rattling coupling. | 28th Nov 1911 | Box 5 \ 5 05-page06 | |
| Minutes from the 87th meeting regarding the reduction of clearance in a gearbox universal joint to fix knocking. | 28th Nov 1911 | Box 5 \ 5 05-page07 | |
| Meeting notes regarding clearance in the universal joint on the gearbox. | 21th Dec 1911 | Box 5 \ 5 05-page08 | |
| Modifications to clutch couplings to improve oil retention and reduce wear for the 2100 series. | 19th Mar 1912 | Box 5 \ 5 05-page09 | |
| Departmental memo discussing improvements to universal joint engine couplings and proposing a trial on car no. 1601. | 15th Jul 1912 | Box 5 \ 5 05-page10 | |
| Advising against experimenting with a new clutch coupling for the chassis. | 13th Apr 1926 | Box 5 \ 5 05-page11 | |
| Confirming an order for three fabric couplings from Messrs. Hillman. | 23th Apr 1928 | Box 5 \ 5 05-page12 | |
| Confirming the order and despatch of three Hillman Fabric Couplings against blueprint G.74711. | 28th Apr 1926 | Box 5 \ 5 05-page13 | |
| Revised standard allowed time and burden sheet for an assembly. | 4th Jun 1928 | Box 5 \ 5 05-page14 | |
| Request for the procurement of various Alpe Couplings without any drilling. | 4th Jun 1928 | Box 5 \ 5 05-page15 | |
| Test report on Hardy fabric couplings, detailing different setups and failure modes. | 15th Jul 1929 | Box 5 \ 5 05-page16 | |
| Results of four sequential tests (Nos. 3, 4, 5, and 6) on a fabric disc coupling attachment. | 15th Jul 1929 | Box 5 \ 5 05-page17 | |
| Test report for Test No. 7, a 50-hour repeat test on disc plates fastened with specific rivets. | 11th Feb 1930 | Box 5 \ 5 05-page18 | |
| Chasing a report on Hillman fabric engine driving couplings for potential cost savings. | 11th Feb 1930 | Box 5 \ 5 05-page19 | |
| Letter to Hardy Spicer & Co. Ltd. concerning failures with fabric couplings. | 30th May 1930 | Box 5 \ 5 05-page20 | |
| Letter from Hardy Spicer & Co. Ltd. acknowledging a complaint and arranging a visit. | 2nd Jun 1930 | Box 5 \ 5 05-page21 | |
| Fabric coupling failures and the suggestion to test a 'Harmetic' coupling disc from a third-party supplier. | 21th Oct 1930 | Box 5 \ 5 05-page22 | |
| 'Fabric Couplings' and sending a drawing to the Universal Ball Bearing Repair and Manufacturing Co. | 3rd Oct 1930 | Box 5 \ 5 05-page23 | |
| Internal office order to purchase one dozen fabric couplings from Hardy Spicer & Co. Ltd. | 6th Oct 1930 | Box 5 \ 5 05-page24 | |
| Letter from Hardy Spicer & Co. Ltd. confirming the supply of two experimental fabric discs for testing, marked 'A' and 'B'. | 4th Jun 1930 | Box 5 \ 5 05-page25 | |
| Letter to Hardy Spicer & Co. Ltd. regarding the testing and supply of modified fabric coupling discs and requesting specifications for a new coupling. | 6th Oct 1930 | Box 5 \ 5 05-page26 | |
| Letter from supplier Hardy Spicer & Co. Ltd. discussing the construction and specifications of discs. | 7th Oct 1930 | Box 5 \ 5 05-page27 | |
| Letter from Hermetic Rubber Co Ltd regarding their 'Hermetic' Flexible Fabric Coupling and confirming an appointment. | 7th Oct 1930 | Box 5 \ 5 05-page28 | |
| Forwarding a copy of a letter from Hermetic Rubber Co. Ltd. regarding the supply of 12 fabric couplings. | 12th Nov 1930 | Box 5 \ 5 05-page29 | |
| Letter from Hermetic Rubber Co. Ltd. regarding the dispatch of 12 couplings for testing. | 8th Nov 1930 | Box 5 \ 5 05-page30 | |
| Request to return a coupling to The Hermetic Rubber Co. Ltd. with observations on its failure. | 10th Feb 1931 | Box 5 \ 5 05-page31 | |
| Letter to a supplier regarding the testing and failure of fabric couplings. | 10th Feb 1931 | Box 5 \ 5 05-page32 | |
| Sending two scrap couplings to the Hermetic Rubber Co. Ltd. for examination. | 10th Feb 1931 | Box 5 \ 5 05-page33 | |
| Letter from Hermetic Rubber Co. Ltd. discussing the performance of flexible fabric couplings and proposed improvements. | 18th Feb 1931 | Box 5 \ 5 05-page34 | |
| Letter from Hermetic Rubber Co Ltd regarding the construction of four pairs of flexible fabric couplings for testing. | 13th Mar 1931 | Box 5 \ 5 05-page35 | |
| Letter to Hardy Spicer & Co. Ltd. enquiring about a particularly good batch of fabric couplings stamped with the number 104. | 28th Mar 1931 | Box 5 \ 5 05-page36 | |
| Letter from Hardy Spicer & Co. Ltd. clarifying disc numbering on flexible couplings and addressing a past complaint. | 30th Mar 1931 | Box 5 \ 5 05-page37 | |
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