| Description | Date | Identifier | |
| Blueprint diagram illustrating a failure point on a front spring clip after a test run. | 11th Jan 1929 | Box 119 \ 2 scan0325 | |
| Blueprint showing a failure analysis on a steering column bracket. | 11th Jan 1929 | Box 119 \ 2 scan0326 | |
| Blueprint detailing a failure in an Axle Control Damper Casing. | 11th Jan 1929 | Box 119 \ 2 scan0327 | |
| Diagram illustrating a failure point on a piston from a rear shock absorber. | 11th Jan 1939 | Box 119 \ 2 scan0328 | |
| Bumper test and requesting the setup of a test rig for centrepoint and front spring lubrication systems. | 15th Jan 1929 | Box 119 \ 2 scan0329 | |
| Running parts on a bumping rig for both 20 HP and 40/50 HP models. | 23th Apr 1929 | Box 119 \ 2 scan0330 | |
| List of modifications and new parts for 40/50 HP and 20 HP models subject to a bump test. | 6th Jun 1929 | Box 119 \ 2 scan0331 | |
| Requesting the preparation of a bumper chassis for testing new spring grooving, exhaust system, engine mounting, and frame cross members. | 6th Jun 1929 | Box 119 \ 2 scan0332 | |
| Request to fit a rear spare wheel carrier with luggage grid and a side wheel carrier to a bumper chassis. | 1st Jun 1929 | Box 119 \ 2 scan0333 | |
| Summary table of bump test results for six different springs, detailing materials, dimensions, performance, and breakages. | 1st Jun 1929 | Box 119 \ 2 scan0334 | |
| Test log detailing the lifespan, running conditions, failure points, and hardness of various springs. | 21th Oct 1929 | Box 119 \ 2 scan0335 | |
| Unsatisfactory nature of the current bumper testing rig and proposing a new one using a Silver Ghost engine. | 21th Oct 1929 | Box 119 \ 2 scan0336 | |
| Diagram showing the method of driving bump drums with Silver Ghost engine and gearbox units. | 22th Oct 1929 | Box 119 \ 2 scan0337 | |
| Request to prepare a 20 HP long frame chassis for testing various components. | 22th Oct 1929 | Box 119 \ 2 scan0338 | |
| Request to modify a Phantom II bump chassis for testing Phantom I springs and to exercise rear springs for chassis 23-EX. | 1st Feb 1930 | Box 119 \ 2 scan0339 | |
| Requesting different sized cams for a bump test and an update on modifications for high-speed radiator testing. | 3rd Feb 1930 | Box 119 \ 2 scan0340 | |
| Correction note regarding an error in cam specifications. | 5th Feb 1930 | Box 119 \ 2 scan0341 | |
| Request to fit lower rating front springs, dumb irons, and hardened shock absorber links to a bumper test chassis. | 6th Jun 1930 | Box 119 \ 2 scan0342 | |
| Specification and test notes for the Bumper Chassis P2, detailing bonnet and radiator movement. | 6th Jun 1930 | Box 119 \ 2 scan0343 | |
| Report detailing test methods and results for radiator and bonnet movement. | 6th Jun 1930 | Box 119 \ 2 scan0344 | |
| Tests concerning radiator and bonnet movement, clearance, and noise prevention. | 6th Jun 1930 | Box 119 \ 2 scan0345 | |
| Report detailing tests on radiator and bonnet mountings, including material changes and performance outcomes. | 6th Jun 1930 | Box 119 \ 2 scan0346 | |
| Test report on using V stay tubes to address an occasional radiator dither on a bumper chassis. | 6th Jun 1930 | Box 119 \ 2 scan0347 | |
| Testing different methods for mounting radiators and V. stay tubes to the vehicle dash and chassis. | 6th Jun 1930 | Box 119 \ 2 scan0348 | |
| Note on experimenting with radiator controls by replacing hard rubbers with very soft ones. | 6th Jun 1930 | Box 119 \ 2 scan0349 | |
| Cross-sectional blueprint diagram of a mechanical component, labeled FIG V. | 15th Sep 1931 | Box 119 \ 2 scan0350 | |
| Blueprint showing two schemes for a centre point suspension radiator end damper. | 15th Sep 1931 | Box 119 \ 2 scan0351 | |
| Blueprint diagram, figure VI, showing the failure points of studs. | 15th Sep 1931 | Box 119 \ 2 scan0352 | |
| Diagram illustrating a cross-section of the radiator bottom tank and its centre mounting. | 12th Oct 1931 | Box 119 \ 2 scan0353 | |
| Experimental drawing for a quarter-scale buffer for bonnet sides, Phase 2. | 12th Oct 1931 | Box 119 \ 2 scan0354 | |
| Blueprint diagram of a radiator bottom tank mounting for the N2 series. | 12th Oct 1931 | Box 119 \ 2 scan0355 | |
| Blueprint diagram illustrating the V Stay Tubes connecting the radiator to the dash. | 28th Sep 1931 | Box 119 \ 2 scan0356 | |
| Cross-sectional diagram of the original V stay fixing. | 28th Sep 1931 | Box 119 \ 2 scan0357 | |
| Disadvantage with the new bumper test rig and proposing modifications. | 7th Apr 1932 | Box 119 \ 2 scan0358 | |
| Bumper test report for a 25 HP Harrison radiator, detailing its satisfactory completion after a 30-hour run and pressure test. | 8th Aug 1932 | Box 119 \ 2 scan0359 | |
| The internal support for side spare wheels and front engine location modifications on a 25 HP bumper chassis. | 8th Aug 1932 | Box 119 \ 2 scan0360 | |
| Urgent request to replace a broken nearside front road spring on a 25 HP chassis to continue shock damper tests. | 13th Aug 1932 | Box 119 \ 2 scan0361 | |
| Arrival and fitting of special road springs for the 25 HP bump chassis. | 26th Aug 1932 | Box 119 \ 2 scan0362 | |
| Examination of a Peregrine Bumper chassis after a bump test, detailing an axle oil test and front road spring failures. | 13th Sep 1932 | Box 119 \ 2 scan0363 | |
| Test report detailing component failures on a Peregrine Bumper chassis after bump testing. | 23th Sep 1932 | Box 119 \ 2 scan0364 | |
| Failures of various components during testing and proposed design improvements. | 23th Sep 1932 | Box 119 \ 2 scan0365 | |
| Revised specification document for the 20/25-HP Bumper Chassis, detailing frames, fittings, and springs. | 29th Sep 1932 | Box 119 \ 2 scan0366 | |
| Description of the 'Bumping Rig' test apparatus used for simulating extreme road conditions on car chassis. | 12th Oct 1932 | Box 119 \ 2 scan0367 | |
| Broken Peregrine engine mounting crossmember and testing of J.III type dampers on a 25HP chassis. | 31th Dec 1932 | Box 119 \ 2 scan0368 | |
| Instruction to modify the 40/50 Bumper Chassis with different spare wheel bracket supports due to bolt failures. | 13th Feb 1933 | Box 119 \ 2 scan0369 | |
| The condition of 40/50 bump chassis shock dampers after 60 hours of running. | 21th Mar 1933 | Box 119 \ 2 scan0370 | |
| Wear on ball end pins, performance of glands, and a summary comparison of dampers. | 28th Oct 1933 | Box 119 \ 2 scan0371 | |
| Instruction to remove and dismantle rolled eyed road springs from a 40/50 bumper chassis for examination. | 28th Oct 1933 | Box 119 \ 2 scan0372 | |
| The failure analysis and comparison of shock damper casings from a Phantom II bumper chassis. | 10th Nov 1933 | Box 119 \ 2 scan0373 | |
| Revised specifications for the Phantom II Bumper Chassis, detailing modifications to shock dampers and the petrol tank. | 15th Nov 1933 | Box 119 \ 2 scan0374 | |
| Instruction to fit a strengthened shock damper ball and bracket to a 40/50 HP+ Bumper Chassis. | 18th Jan 1934 | Box 119 \ 2 scan0375 | |
| Fitting a new front axle and shock damper brackets to a 25 HP Bumper Chassis to test a Vulture front axle. | 19th Jan 1934 | Box 119 \ 2 scan0376 | |
| Instruction to fit a set of Firth springs to a Bentley Bumper chassis. | 20th Jan 1934 | Box 119 \ 2 scan0377 | |
| Request to fit a new frame to a 25 HP Bumper chassis. | 9th Mar 1934 | Box 119 \ 2 scan0378 | |
| Instruction to build up a pair of the latest type rear shock dampers for the 40/50 Bumper Chassis. | 17th Apr 1934 | Box 119 \ 2 scan0379 | |
| List of specifications and modifications for the 25 HP Bumper Chassis. | 7th Jun 1934 | Box 119 \ 2 scan0380 | |
| Request to build a new petrol tank for a Bentley Bumper Chassis with modified suspension and tunnel. | 8th Jun 1934 | Box 119 \ 2 scan0381 | |
| Request to recondition two Phantom II engines used for driving Bumper rigs. | 14th Jun 1934 | Box 119 \ 2 scan0382 | |
| List of required items and modifications for the Bentley Bumper Chassis. | 24th Jul 1934 | Box 119 \ 2 scan0383 | |
| Requesting the scrapping of a 25 HP Bump Chassis, with instructions to retain the road springs. | 20th Sep 1934 | Box 119 \ 2 scan0384 | |
| Chassis testing, rear axle mounts, and project progress. | 17th Dec 1934 | Box 119 \ 2 scan0385 | |
| Repair of a Bentley Bump Chassis and the fitting of a lightened front cross member. | 27th Dec 1934 | Box 119 \ 2 scan0386 | |
| Requesting the fitting of water excluding devices to a scrap Bentley bumper axle. | 27th Dec 1934 | Box 119 \ 2 scan0387 | |
| List of required items for a Bentley Bumper Chassis. | 28th Dec 1934 | Box 119 \ 2 scan0388 | |
| Listing parts for testing on the Bentley Bumper Chassis. | 31th Dec 1934 | Box 119 \ 2 scan0389 | |
| Request to fit a pair of strengthened bottom ball end supports to a bumper chassis. | 19th Jan 1935 | Box 119 \ 2 scan0390 | |
| Secret memo regarding the Spectre Bumper Test and a warning about potential radiator anchorage fracture. | 1st Feb 1935 | Box 119 \ 2 scan0391 | |
| The initial 12-hour test run of the Spectre Bumper Chassis, detailing teething troubles and future testing plans. | 1st Feb 1935 | Box 119 \ 2 scan0392 | |
| Procedure for a Spectre Bumper Test to prevent radiator anchorage fracture. | 1st Feb 1935 | Box 119 \ 2 scan0393 | |
| Requesting the urgent installation of electric lights over a new bumper in the Bump House. | 5th Feb 1935 | Box 119 \ 2 scan0394 | |
| Short memo confirming the arrangement of a Spectre Bumper Test. | 6th Feb 1935 | Box 119 \ 2 scan0395 | |
| Special lightened Firth's road springs for a Bentley Bumper, requesting they be weighed and fitted. | 13th Feb 1935 | Box 119 \ 2 scan0396 | |
| Urgent memo regarding a collapsed engine mounting on chassis LeC.3954, with instructions to fit it to chassis LeC.4127. | 13th Feb 1935 | Box 119 \ 2 scan0397 | |
| Requesting repair of a brake drum and replacement of the adjustment mechanism on a Spectre Bump Chassis. | 20th Feb 1935 | Box 119 \ 2 scan0398 | |
| Requesting an electrician to inspect faulty electrical equipment in the Bump. | 15th Mar 1935 | Box 119 \ 2 scan0399 | |
| Instruction to fit a set of road springs and lighten the front hubs on a Bentley Bumper Chassis. | 25th Mar 1935 | Box 119 \ 2 scan0400 | |
| Instruction regarding failures and replacement of engine torque reaction damper plates on the Bentley Bumper Chassis. | 26th Apr 1935 | Box 119 \ 2 scan0401 | |
| Request to complete the Spectre Bumper Chassis which is missing its engine. | 16th May 1935 | Box 119 \ 2 scan0402 | |
| Request to modify a Bentley Bumper Chassis to reproduce a stub-axle failure for testing. | 24th May 1935 | Box 119 \ 2 scan0403 | |
| Request to produce a pair of cast-iron damper pistons (G.81434) for the Spectre Bumper Chassis front suspension. | 24th May 1935 | Box 119 \ 2 scan0404 | |
| The failure of the Spectre bumper due to loose shock damper bolts and a suggestion to increase bolt diameter. | 4th Jul 1935 | Box 119 \ 2 scan0405 | |
| Requesting modification to a Spectre bump chassis and reassembly of a Phantom engine for a Bentley bumper. | 12th Jul 1935 | Box 119 \ 2 scan0406 | |
| Requesting the fitment of the latest Bentley Stabilising Bumper Bars to a Bentley Bump Chassis. | 24th Aug 1935 | Box 119 \ 2 scan0407 | |
| Insufficient power from Bumper Rig drums for a Ph.III engine and a request for a temporary fixture. | 24th Oct 1935 | Box 119 \ 2 scan0408 | |
| List of failures on the Ph.III Bumper Chassis and subsequent updates. | 10th Jan 1936 | Box 119 \ 2 scan0409 | |
| Table detailing part failures on a Ph.III Bumper, the hours they ran, and the subsequent production improvements. | 10th Jan 1936 | Box 119 \ 2 scan0410 | |
| Component testing log detailing parts, their operational hours, and resulting improvements or failures. | 10th Jan 1936 | Box 119 \ 2 scan0411 | |
| Photograph showing a fractured bumper component after endurance testing on different cams. | 12th Dec 1935 | Box 119 \ 2 scan0412 | |
| Photograph of a bumper cam after a 30-hour test, with annotated thickness measurements. | 12th Dec 1935 | Box 119 \ 2 scan0413 | |
| Photograph showing a fractured SPECTRE shock damper spring after a running test. | 7th Nov 1935 | Box 119 \ 2 scan0414 | |
| Photograph comparing two fractured mechanical components, Spectre II and Spectre III. | 3rd Dec 1935 | Box 119 \ 2 scan0415 | |
| Photograph showing thickness measurements of a bumper for 3 inch cams after 40 hours and 40 minutes of use. | 3rd Dec 1935 | Box 119 \ 2 scan0416 | |
| Photograph showing a comparison of fractured and intact mechanical levers and a bolt. | 19th Dec 1935 | Box 119 \ 2 scan0417 | |
| Photograph showing cracking on an aluminium bronze spring box after testing. | 7th Nov 1935 | Box 119 \ 2 scan0418 | |
| Instruction to repair a broken frame and refit modified mild steel front engine feet for a Phantom III Bumper Chassis. | 26th Feb 1937 | Box 119 \ 2 scan0419 | |
| Instruction memo for fitting specific suspension and spring parts to a Phantom III Bumper Chassis. | 2nd Mar 1937 | Box 119 \ 2 scan0420 | |
| Fitting a simpler gearbox to engine stay to a Phantom III bump chassis. | 10th Mar 1937 | Box 119 \ 2 scan0421 | |
| On testing an experimental louvered bonnet for the Austrian Alpine Contest. | 6th May 1913 | Box 119 \ 3 scan0001 | |
| To Mr Barrington regarding the dispatch of a louvred bonnet to Mr Johnson. | 31th Aug 1912 | Box 119 \ 3 scan0002 | |
| Letter requesting tests on different bonnet configurations to assess their effect on engine cooling. | 31th Aug 1912 | Box 119 \ 3 scan0003 | |
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