| Description | Date | Identifier | |
| Effect of friction and irreversibility in worm and nut steering components. | 22th Mar 1927 | Box 67 \ 4 scan0279 | |
| Instruction to produce and fit an aluminium steering column bracket on the Trials Car for the Phantom Chassis. | 22th Mar 1927 | Box 67 \ 4 scan0280 | |
| Modification to the steering worm pitch for a Phantom model. | 24th Mar 1927 | Box 67 \ 4 scan0281 | |
| Parts list for a self-centering steering system on a 'D' type Phantom chassis. | 25th Mar 1927 | Box 67 \ 4 scan0282 | |
| Production of tools and parts for Phantom steering systems, some of which is free of charge work. | 28th Mar 1927 | Box 67 \ 4 scan0283 | |
| Alternative steering proposals and experiments for Phantom cars. | 7th Apr 1927 | Box 67 \ 4 scan0284 | |
| Experimental setup for a proposed returning spring on the steering worm tube. | 7th Apr 1927 | Box 67 \ 4 scan0285 | |
| Potential simplification of manufacturing steering worms by using a larger grinding wheel. | 11th Apr 1927 | Box 67 \ 4 scan0286 | |
| Issues and proposed modifications to the Phantom's steering geometry. | 12th Apr 1927 | Box 67 \ 4 scan0287 | |
| Improvements to the steering worm and nut, and spring return system. | 16th Apr 1927 | Box 67 \ 4 scan0288 | |
| Self-centering steering, spring returns, and component requisitions. | 5th May 1927 | Box 67 \ 4 scan0289 | |
| Steering performance and proposed modifications for the Phantom model after a 10,000-mile test. | 5th May 1927 | Box 67 \ 4 scan0290 | |
| Design notes for an improved front axle for the 20 HP car, based on the Phantom, to avoid gyrostatic reaction and tyre scrub. | 5th May 1927 | Box 67 \ 4 scan0291 | |
| Revised steering column and magneto controls on the Phantom Chassis to eliminate 'click-on' type ball joints. | 5th May 1927 | Box 67 \ 4 scan0292 | |
| The bumping and road tests of the 40/50 HP front axle control, discussing braking balance, skidding, and torque control. | 6th May 1927 | Box 67 \ 4 scan0293 | |
| The arrangement of dampers for torque control and the results of a bench test on a torque arm and front spring. | 6th May 1927 | Box 67 \ 4 scan0294 | |
| Steering performance, road reaction, and potential improvements on 40/50 HP and Phantom models. | 6th May 1927 | Box 67 \ 4 scan0295 | |
| Issues and experiences with different lead worm and nut steering components. | 11th May 1927 | Box 67 \ 4 scan0296 | |
| Steering irreversibility and the testing of different worm and nut combinations. | 11th May 1927 | Box 67 \ 4 scan0297 | |
| Experiments for the general improvement of the Phantom steering system. | 2nd May 1927 | Box 67 \ 4 scan0298 | |
| Road test report on high speed wobbles resulting from a specific axle configuration and wheel type. | 13th May 1927 | Box 67 \ 4 scan0299 | |
| Instruction to hold work on the Phantom Chassis steering column and box, pending new schemes. | 13th May 1927 | Box 67 \ 4 scan0300 | |
| EAC.7 geometry layouts, modifications, and steering experiments for the Phantom. | 20th May 1927 | Box 67 \ 4 scan0301 | |
| Requesting a modification to the Phantom's steering column and seating to fix an issue with pedal distance. | 23th May 1927 | Box 67 \ 4 scan0302 | |
| Trial results and requesting new springs for a 40/50 HP self-centering steering device. | 24th May 1927 | Box 67 \ 4 scan0303 | |
| From 'R.' detailing a list of car development objectives for a board meeting. | 25th May 1927 | Box 67 \ 4 scan0304 | |
| Experimental self-centring spring for the Phantom steering column. | 26th May 1927 | Box 67 \ 4 scan0305 | |
| Design and performance of Lovejoy shock dampers and steering connections. | 30th May 1927 | Box 67 \ 4 scan0306 | |
| Proposal and request regarding a modified seating position for standard 'D' type cars. | 3rd Jun 1927 | Box 67 \ 4 scan0307 | |
| Modification to a self-centring steering scheme for the Phantom Chassis using leaf springs on a pendulum lever. | 10th Jun 1927 | Box 67 \ 4 scan0308 | |
| Analysis of heavy steering on a Phantom chassis (18-LF), attributing it to American tyres and suggesting remedies. | 1st Jun 1927 | Box 67 \ 4 scan0309 | |
| Heavy steering on 40/50 and 20 HP models, attributing it to tyre tread types and recommending solutions. | 1st Jun 1927 | Box 67 \ 4 scan0310 | |
| Depot sheet concerning heavy steering on 40/50HP and 20HP models due to tyre tread shape. | 30th Jun 1927 | Box 67 \ 4 scan0311 | |
| Communication regarding steering difficulties at low speeds experienced in America. | 24th Jun 1927 | Box 67 \ 4 scan0312 | |
| Delay in discussing a heavy steering issue with 'OY' following a cable from Mr. Fuller. | 25th Jun 1927 | Box 67 \ 4 scan0313 | |
| Providing feedback on a car's poor steering and handling characteristics. | 29th Jun 1927 | Box 67 \ 4 scan0314 | |
| Front tyres and the positive effect of a recent change. | 30th Jun 1927 | Box 67 \ 4 scan0315 | |
| Steering improvements on the 18-LF model, comparing the requirements for the USA market versus domestic conditions. | 30th Jun 1927 | Box 67 \ 4 scan0316 | |
| Steering column vibrations on the 10-EX experimental car, suggesting a stiffer column. | 2nd Jul 1927 | Box 67 \ 4 scan0317 | |
| Fitting a shortened 'D' column to an experimental chassis for testing. | 6th Jul 1927 | Box 67 \ 4 scan0318 | |
| Urgent internal memo requesting three types of steering columns for efficiency testing. | 7th Jul 1927 | Box 67 \ 4 scan0319 | |
| Stating there has been no new experience to change a previously held opinion on low pressure tyres. | 8th Jul 1927 | Box 67 \ 4 scan0320 | |
| Testing of low-pressure tyres on Phantom models, focusing on steering modifications and mileage performance. | 1st Oct 1926 | Box 67 \ 4 scan0321 | |
| The performance and experience with low-pressure tyres on experimental cars, continued from a previous page. | 8th Jul 1927 | Box 67 \ 4 scan0322 | |
| Challenges of fitting and testing a shortened 'D' steering column. | 8th Jul 1927 | Box 67 \ 4 scan0323 | |
| Improvements to the Phantom's steering and radiator design regarding weight distribution and appearance. | 9th Jul 1927 | Box 67 \ 4 scan0324 | |
| Requesting to rig up the hydraulic damper in the steering system to a specific load. | 12th Jul 1927 | Box 67 \ 4 scan0325 | |
| Modifications to a 'Phantom' car, specifically adding blocks to the pedals and a false floorboard. | 13th Jul 1927 | Box 67 \ 4 scan0326 | |
| Explaining the mechanics and forces involved in the irreversibility of a steering worm and nut system. | 13th Jul 1927 | Box 67 \ 4 scan0327 | |
| Mathematical calculations for the efficiency of a nut and worm mechanism when acting and 'parking'. | 13th Jul 1927 | Box 67 \ 4 scan0328 | |
| Analysis of forces in a worm and nut mechanism, specifically the 'joggling' condition. | 13th Jul 1927 | Box 67 \ 4 scan0329 | |
| Calculations and a diagram analyzing the effect of thread angle on friction and mechanical efficiency. | 13th Jul 1927 | Box 67 \ 4 scan0330 | |
| Mechanical analysis of the forces and irreversibility within a steering worm and nut assembly. | 13th Jul 1927 | Box 67 \ 4 scan0331 | |
| Page of mathematical calculations for the efficiency of a worm and nut mechanism. | 13th Jul 1927 | Box 67 \ 4 scan0332 | |
| Calculation of forces in a worm and nut system for 'joggling' and 'parking' conditions. | 13th Jul 1927 | Box 67 \ 4 scan0333 | |
| Page of calculations and diagrams analysing mechanical efficiency and the effect of thread angle. | 13th Jul 1927 | Box 67 \ 4 scan0334 | |
| Describing plots related to the variation of efficiency with helix angle and coefficient of friction. | 13th Jul 1927 | Box 67 \ 4 scan0335 | |
| Hand-drawn graph of efficiency versus helix angle for different coefficients of friction, titled 'Joggles' and 'Parking'. | 13th Jul 1927 | Box 67 \ 4 scan0336 | |
| Graph plotting efficiency against helix angle for various coefficients of friction under joggle conditions. | 13th Jul 1927 | Box 67 \ 4 scan0337 | |
| Graph showing parking efficiency versus helix angle for different friction coefficients (μ). | 14th Jul 1927 | Box 67 \ 4 scan0338 | |
| Confirming the decision to fit up part 78-SC for a shortened 'D' column. | 14th Jul 1927 | Box 67 \ 4 scan0339 | |
| Request to the Pattern Shop for pedal blocks and a board for chassis 78-SC. | 14th Jul 1927 | Box 67 \ 4 scan0340 | |
| Request to obtain a '720' and a '940' lead worm and nut from production for testing purposes. | 14th Jul 1927 | Box 67 \ 4 scan0341 | |
| Trial modifications to the Phantom steering system to reduce oil film breakdown. | 14th Jul 1927 | Box 67 \ 4 scan0342 | |
| Sending the design for Phantom steering modifications, which requires a new steering box. | 16th Jul 1927 | Box 67 \ 4 scan0343 | |
| Required test loads for steering joggles and the hydraulic steering damper lever. | 8th Jul 1927 | Box 67 \ 4 scan0344 | |
| Technical memorandum discussing the issues of road shocks and 'joggles' in worm and nut steering systems. | 19th Jul 1927 | Box 67 \ 4 scan0345 | |
| Continued report on steering box performance, comparing 'parking' and 'joggling' conditions. | 5th Sep 1932 | Box 67 \ 4 scan0346 | |
| Requisition form for blueprints. | 5th Sep 1932 | Box 67 \ 4 scan0347 | |
| Graph showing the force required to operate a .720 worm with motorine coil under various load conditions. | 20th Jul 1927 | Box 67 \ 4 scan0348 | |
| Cancellation instructions for a .685 worm for the Phantom Chassis steering column. | 20th Jul 1927 | Box 67 \ 4 scan0349 | |
| Letter detailing steering tests and comparisons between Springfield and Derby models. | 22th Jul 1927 | Box 67 \ 4 scan0350 | |
| Letter discussing steering efficiency tests and the phenomenon of 'stricking' friction at high temperatures. | 22th Jul 1927 | Box 67 \ 4 scan0351 | |
| Hand-drawn graph on blueprint paper comparing the viscosities of various oils at different temperatures. | 22th Jul 1927 | Box 67 \ 4 scan0352 | |
| Secret axle control on the 12-EX model, a new sports car, and steering efficiency tests. | 22th Jul 1927 | Box 67 \ 4 scan0353 | |
| Steering difficulties on the Springfield Chassis, particularly concerning low-pressure tires and worm gear modifications. | 8th Aug 1927 | Box 67 \ 4 scan0354 | |
| Technical note discussing issues with brake clanking and exhaust banging, and potential solutions. | 8th Aug 1927 | Box 67 \ 4 scan0355 | |
| Engine governor and throttle combinations for perfection in various driving situations. | 10th Aug 1927 | Box 67 \ 4 scan0356 | |
| Requesting a cable be sent to Springfield regarding steering box temperatures. | 10th Aug 1927 | Box 67 \ 4 scan0357 | |
| Draft of a cable to Springfield, Mass. regarding steering box temperatures. | 10th Aug 1927 | Box 67 \ 4 scan0358 | |
| Steering problems, tests, and potential solutions including a new worm and nut design. | 12th Aug 1927 | Box 67 \ 4 scan0359 | |
| Investigating steering stiffening complaints from America for 40/50 HP models. | 1st Aug 1927 | Box 67 \ 4 scan0360 | |
| Analysis of sticking and tightening issues in a worm and nut mechanism, focusing on the effects of temperature and lubricants. | 1st Aug 1927 | Box 67 \ 4 scan0361 | |
| The causes of and solutions for steering sticking and heaviness, considering load, tyres, and steering ratio. | 1st Aug 1927 | Box 67 \ 4 scan0362 | |
| Page discussing investigations into 'heavy steering' and 'American sticking' problems. | 1st Aug 1927 | Box 67 \ 4 scan0363 | |
| Steering tests to determine oil temperature in the steering box under normal and extreme conditions. | 1st Aug 1927 | Box 67 \ 4 scan0364 | |
| Instruction to manufacture a .900 steering worm without oil grooves. | 1st Aug 1927 | Box 67 \ 4 scan0365 | |
| Request to make two sets of friction for the 40/50 HP model and two sets for the 20 HP model. | 1st Aug 1927 | Box 67 \ 4 scan0366 | |
| Possibility of deleting oil grooves in steering worms. | 13th Aug 1927 | Box 67 \ 4 scan0367 | |
| Testing steering worms for the Phantom model without oil grooves or holes. | 15th Aug 1927 | Box 67 \ 4 scan0368 | |
| Friction and play in a steering column, with plans for a scheme to increase the bearing area of plates on the serrations. | 17th Aug 1927 | Box 67 \ 4 scan0369 | |
| Worm and nut tests detailing the experimental methodology and results for various oils under different lubrication conditions. | 17th Aug 1927 | Box 67 \ 4 scan0370 | |
| Experiments testing the effect of temperature and oil pressure on the friction within a steering box. | 17th Aug 1927 | Box 67 \ 4 scan0371 | |
| Graph plotting force versus load on a nut for a No. 2 worm gear with 'Motorine C' lubricant, showing issues with bad sticking. | 22th Aug 1927 | Box 67 \ 4 scan0372 | |
| Calculations of the coefficient of friction and efficiency for a '1940 Worm No.2' component under various conditions. | 22th Aug 1927 | Box 67 \ 4 scan0373 | |
| Graph plotting load test results for a .720 worm gear using castor oil at an air temperature of 17-20°C. | 22th Aug 1927 | Box 67 \ 4 scan0374 | |
| Efficiency calculations for a .720 worm gear using castor oil at 20°C. | 3rd Oct 1927 | Box 67 \ 4 scan0375 | |
| Table detailing the specifications for different types of worms and nuts. | 3rd Oct 1927 | Box 67 \ 4 scan0376 | |
| Comparison of lubricants for different worm gear applications, ranked by preference. | 3rd Oct 1927 | Box 67 \ 4 scan0377 | |
| Table comparing various oils under parking and joggles conditions for two worm types. | 3rd Oct 1927 | Box 67 \ 4 scan0378 | |
| | | | |
