| Description | Date | Identifier | |
| Experiments with front rubber engine mounts and frame stiffness to reduce chassis 'jellying'. | 2nd Apr 1931 | Box 137 \ 4 scan0305 | |
| Engine mounting, frame stiffness, and body booms to reduce vibrations. | 8th Apr 1931 | Box 137 \ 4 scan0306 | |
| Chassis stiffness, engine mounting, and suspension improvements, with comparisons to Bentley. | 8th Apr 1931 | Box 137 \ 4 scan0307 | |
| Potential engine and chassis improvements to resolve issues with high speeds and body booms. | 9th Apr 1931 | Box 137 \ 4 scan0308 | |
| Development of a new 6-cylinder car (J.3), the need for improved torsional chassis stiffness, and competition from Bentley. | 9th Apr 1931 | Box 137 \ 4 scan0309 | |
| Engine development priorities, chassis issues, and competition from Bentley. | 9th Apr 1931 | Box 137 \ 4 scan0310 | |
| Methods for improving chassis rigidity to reduce vibration and shimmy. | 9th Apr 1931 | Box 137 \ 4 scan0311 | |
| Analysis of an unbearable booming noise in a 25 HP car, focusing on body and chassis issues. | 10th Apr 1931 | Box 137 \ 4 scan0312 | |
| On car engine vibrations and 'booming', particularly in the P.2. model, detailing diagnostic telegrams and proposed solutions. | 12th Apr 1931 | Box 137 \ 4 scan0313 | |
| Analysis of engine vibration issues with proposed modifications to the crankshaft, flywheel, and bearings. | 12th Apr 1931 | Box 137 \ 4 scan0314 | |
| Engine performance at 45 MPH, specifically piston inertia, crankshaft torsion, and flywheel support, along with modifications to a 6-cylinder engine. | 13th Apr 1931 | Box 137 \ 4 scan0315 | |
| Urgent instructions for collecting Lord Allendale's car (110-GY) to investigate and rectify an oil leak, roar, and vibration issues. | 13th Apr 1931 | Box 137 \ 4 scan0316 | |
| Letter concerning adjustments and repairs for Lord Allendale's Phantom II vehicle. | 11th Apr 1931 | Box 137 \ 4 scan0317 | |
| Dissatisfaction with a 6-cylinder engine, focusing on crankshaft torsional vibrations and damper design. | 14th Apr 1931 | Box 137 \ 4 scan0318 | |
| Vibration damping, proposing a centrifugally loaded damper design with an accompanying sketch. | 14th Apr 1931 | Box 137 \ 4 scan0319 | |
| Future and the development of a 6-cylinder engine. | 18th Apr 1931 | Box 137 \ 4 scan0320 | |
| Customer complaints about 'booms' and a proposed modification to the rear engine feet and column support. | 18th Apr 1931 | Box 137 \ 4 scan0321 | |
| Investigation into a 'booming' noise complaint on Phantom II chassis. | 18th Apr 1931 | Box 137 \ 4 scan0322 | |
| Investigation into the cause of a 'boom' noise at 2200 r.p.m. in Phantom II cars. | 18th Apr 1931 | Box 137 \ 4 scan0323 | |
| Investigation into the cause and potential cure of a 'boom' or vibration found on Phantom II cars. | 18th Apr 1931 | Box 137 \ 4 scan0324 | |
| Road test report detailing vehicle noises, vibrations, and carburation performance. | 20th Apr 1931 | Box 137 \ 4 scan0325 | |
| Standardisation sheet for the removal of rear engine feet on the Phantom II model to fix a booming issue. | 21th Apr 1931 | Box 137 \ 4 scan0326 | |
| Persistent booming complaint from Lord Allendale regarding car 110-GY. | 21th Apr 1931 | Box 137 \ 4 scan0327 | |
| Investigation into the cause of chassis vibrations, analysing impulses, torque reactions and crankshaft deflection at various speeds. | 21th Apr 1931 | Box 137 \ 4 scan0328 | |
| Potential chassis modifications to alter periodicity. | 1st Apr 1931 | Box 137 \ 4 scan0329 | |
| Transcribing a telegram about a conference on torsional periods and a request to borrow a car. | 24th Apr 1931 | Box 137 \ 4 scan0330 | |
| Cause of 'boomers' in Phantom II models, related to sub-frame versus direct-on-frame construction. | 27th Apr 1931 | Box 137 \ 4 scan0331 | |
| Torsional period testing on a 25HP engine with 12 balance weights. | 27th Apr 1931 | Box 137 \ 4 scan0332 | |
| Test report on a 25 HP engine's double rear crankshaft flywheel bearing. | 4th May 1931 | Box 137 \ 4 scan0333 | |
| Request to change from a 12 to an 8 balance weight scheme on a large pin 25 HP crankshaft. | 4th May 1931 | Box 137 \ 4 scan0334 | |
| The balance weight scheme for a 25 HP shaft. | 1st May 1931 | Box 137 \ 4 scan0335 | |
| Data sheet listing specifications for P.II. and 25 HP engine components, focusing on crankshafts, balance, and flywheels. | 1st May 1931 | Box 137 \ 4 scan0336 | |
| Causes and potential cures for 'booms' and 'jelly-ing' in cars. | 4th May 1931 | Box 137 \ 4 scan0337 | |
| Technical memo discussing the adjustment of scuttle bolts and the use of a rubber column bracket to manage torque reaction and vibration. | 4th May 1931 | Box 137 \ 4 scan0338 | |
| Blueprint for a Rear Engine Foot Plate. | 4th May 1931 | Box 137 \ 4 scan0339 | |
| Blueprint for a Rear Engine Foot Plate. | 5th May 1931 | Box 137 \ 4 scan0340 | |
| Arrangement of tie rod supporting spare wheel carrier (side) to dash. | 5th May 1931 | Box 137 \ 4 scan0341 | |
| Drawing of a rubber isolation steering column support bracket. | 8th Apr 1931 | Box 137 \ 4 scan0342 | |
| Car engine suspension designs and vibration damping for P.2 and J.1 models. | 7th May 1931 | Box 137 \ 4 scan0343 | |
| Investigating a 'booming' noise, determining its periodicity and concluding it is a body or frame characteristic. | 7th May 1931 | Box 137 \ 4 scan0344 | |
| The investigation and resolution of a 25 HP gearbox oscillation issue. | 11th May 1931 | Box 137 \ 4 scan0345 | |
| Technical memo detailing modifications for a 25 HP model, designated 'JAPAN 1'. | 2nd May 1931 | Box 137 \ 4 scan0346 | |
| Continued memorandum on vehicle component alterations for the crankchamber, brakes, rear axle, and petrol pump. | 2nd May 1931 | Box 137 \ 4 scan0347 | |
| Scheme for fitting balance weights to 25 HP and Phantom engines to address faults. | 16th May 1931 | Box 137 \ 4 scan0348 | |
| Crankshaft balance weights and critical speeds for the 25 HP and Phantom 11 engines. | 16th May 1931 | Box 137 \ 4 scan0349 | |
| Blueprint comparing two design schemes for a crankshaft with performance data. | 16th May 1931 | Box 137 \ 4 scan0350 | |
| Engine smoothness and the effects of various balance weight schemes. | 8th May 1931 | Box 137 \ 4 scan0351 | |
| Different balance weight schemes for an engine to reduce stress and vibrations. | 19th May 1931 | Box 137 \ 4 scan0352 | |
| Engine balance weight schemes, experiments, and designs for 25 HP production. | 9th May 1931 | Box 137 \ 4 scan0353 | |
| Effect of balance weights on flywheel wobble in Phantom II and 25 HP models. | 23th May 1931 | Box 137 \ 4 scan0354 | |
| The testing of flywheel balance weights and their effect on performance and wear. | 23th May 1931 | Box 137 \ 4 scan0355 | |
| Solutions for flywheel flutter and vibration by modifying the flywheel's centre of gravity and mass. | 27th May 1931 | Box 137 \ 4 scan0356 | |
| Instruction to fit stronger springs to bonnet clips when removing rear engine feet. | 28th May 1931 | Box 137 \ 4 scan0357 | |
| Investigation into a gear rattle on the 25 HP model, particularly on overrun when hot. | 29th May 1931 | Box 137 \ 4 scan0358 | |
| Technical note on experiments with a flexible drive between the flywheel and gearbox, and the resulting gear rattles. | 29th May 1931 | Box 137 \ 4 scan0359 | |
| High-speed engine smoothness tests for a 25 HP car fitted with a new roller tail bearing. | 30th May 1931 | Box 137 \ 4 scan0360 | |
| Experiments with a torque arm for Phantom II engine mounting. | 2nd Jun 1931 | Box 137 \ 4 scan0361 | |
| Report verifying that piston motion is the cause of overrun gear rattle in a 25 HP engine. | 9th Jun 1931 | Box 137 \ 4 scan0362 | |
| Test report on jellying, torque reaction, booms, and steering effects from different loads on front torque reaction dampers. | 4th Jul 1931 | Box 137 \ 4 scan0363 | |
| Test report on torque reaction dampers and their effects on vehicle performance and comfort. | 4th Jul 1931 | Box 137 \ 4 scan0364 | |
| Continuation of a vehicle road test report detailing observations on booms, jellying, and steering. | 4th Jul 1931 | Box 137 \ 4 scan0365 | |
| The results of the 5th test, detailing conditions, torque reaction, booms, steering, and wing jelly-ing. | 8th Jul 1931 | Box 137 \ 4 scan0366 | |
| Tests to overcome flywheel vibration and gear rattle on a 25 HP engine using a stiffened flywheel. | 8th Jul 1931 | Box 137 \ 4 scan0367 | |
| Blueprint of a Hardy coupling for a clutch, showing plan and cross-section views. | 18th Sep 1931 | Box 137 \ 4 scan0368 | |
| Flywheel vibration issues on the 'CHINA' project, worsened by attempts at stiffening. | 21th Jul 1931 | Box 137 \ 4 scan0369 | |
| Experiments with balance weights to reduce flywheel vibrations in a 25 HP engine. | 22th Jul 1931 | Box 137 \ 4 scan0370 | |
| Calculations regarding balance weights for the stiffened Phantom crankshaft Lec.2925. | 1st Sep 1931 | Box 137 \ 4 scan0371 | |
| Drawing and calculation for a balance weight for LEC 2925. | 11th Aug 1931 | Box 137 \ 4 scan0372 | |
| Cause and proposed remedy for friction plate breakages in a 40/50 HP chassis low inertia damper. | 11th Aug 1931 | Box 137 \ 4 scan0373 | |
| Request to manufacture a Torsional Vibration Damper for a 25 HP engine, specifying materials. | 17th Aug 1931 | Box 137 \ 4 scan0374 | |
| Vibration damper for a 28 HP, 2 inch pin crankshaft. | 17th Aug 1931 | Box 137 \ 4 scan0375 | |
| Engine balance weights and flywheel vibration issues on a 25HP model. | 19th Aug 1931 | Box 137 \ 4 scan0376 | |
| Outlining the design specifications for a proposed harmonic damper. | 21th Aug 1931 | Box 137 \ 4 scan0377 | |
| And comparing different designs for a dynamic balancer. | 22th Aug 1931 | Box 137 \ 4 scan0378 | |
| Causes of three separate low inertia damper spring plate failures. | 24th Aug 1931 | Box 137 \ 4 scan0379 | |
| The design and effectiveness of an auto friction damper for the 40/50 model. | 24th Aug 1931 | Box 137 \ 4 scan0380 | |
| Providing patent drawings for two dynamic balancer schemes. | 26th Aug 1931 | Box 137 \ 4 scan0381 | |
| Tests to find the effect of the amount and position of balance weights on flywheel vibration for a 25 HP engine. | 27th Sep 1931 | Box 137 \ 4 scan0382 | |
| Blueprint showing three numbered line schematics. | 27th Aug 1931 | Box 137 \ 4 scan0383 | |
| Use of harmonic balancers in American cars and proposing a design for a 3.5-litre engine. | 27th Aug 1931 | Box 137 \ 4 scan0384 | |
| Alternative construction for a J.3. Dynamic Balancer and a request for a patent. | 5th Sep 1931 | Box 137 \ 4 scan0385 | |
| Outstanding rough sketches for a rear engine feet safety plate for chassis No.122-XJ. | 16th Sep 1931 | Box 137 \ 4 scan0386 | |
| Test of Chrysler balance weights for a 25 HP engine to eliminate flywheel vibration. | 21th Sep 1931 | Box 137 \ 4 scan0387 | |
| Dispatch of blueprints for booms on Chassis No. 122-XJ, which were previously missed. | 23th Sep 1931 | Box 137 \ 4 scan0388 | |
| Conclusions on engine balance weights, flywheel vibrations, and crankchamber deflections. | 28th Sep 1931 | Box 137 \ 4 scan0389 | |
| Tests conducted on flywheel vibrations for the 25 HP engine. | 30th Sep 1931 | Box 137 \ 4 scan0390 | |
| Test report on a 25 HP low inertia spring drive, detailing damping load experiments and modifications. | 30th Sep 1931 | Box 137 \ 4 scan0391 | |
| On the trials for car 129-GN, detailing efforts to reduce drumming and booming with mixed results, including increased steering wheel vibration. | 2nd Oct 1931 | Box 137 \ 4 scan0392 | |
| 25 HP engine roughness, detailing tests on a thin flange flywheel and Chrysler balance weights. | 5th Oct 1931 | Box 137 \ 4 scan0393 | |
| Flywheel vibration and balance weight testing for the 25 HP engine. | 19th Oct 1931 | Box 137 \ 4 scan0394 | |
| Balancing of a crankshaft and the scheme of balance weights. | 20th Oct 1931 | Box 137 \ 4 scan0395 | |
| Engine vibrations and improvements using diamond mountings and torque reaction dampers on a 6-cylinder engine. | 20th Oct 1931 | Box 137 \ 4 scan0396 | |
| Requesting the return of calculations for a Buick type vibration damper to aid in investigating their own damper design. | 22th Oct 1931 | Box 137 \ 4 scan0397 | |
| Letter to a supplier regarding the failure of a cotton duck washer for a crankshaft damper and a request for a stronger version. | 2nd Nov 1931 | Box 137 \ 4 scan0398 | |
| Letter from British Belting & Asbestos Ltd acknowledging an inquiry about Cotton Discs E.55092 for a crankshaft damper. | 3rd Nov 1931 | Box 137 \ 4 scan0399 | |
| Effects and measurement of friction torsional vibration dampers. | 7th Nov 1931 | Box 137 \ 4 scan0400 | |
| Tests of balance weights and the relative merits of standard vs low inertia spring drives on the 25 HP model. | 7th Nov 1931 | Box 137 \ 4 scan0401 | |
| Experiments to improve frame torsional stiffness on larger cars by rigidly mounting the engine and gearbox. | 28th Nov 1931 | Box 137 \ 4 scan0402 | |
| Tests to resolve timing gear rattles on a 25 HP engine. | 30th Nov 1931 | Box 137 \ 4 scan0403 | |
| Experiments investigating flywheel vibration on a 25 HP engine using a balanced crankshaft. | 1st Dec 1931 | Box 137 \ 4 scan0404 | |
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