| Description | Date | Identifier | |
| Letter discussing the technical specifications for fitting suspension systems, lever arms, and brackets. | 3rd Jul 1924 | Box 25 \ 2 Scan062 | |
| Letter from The Houdaille Hydraulic Suspension Co. regarding the fitting and adjustment of their suspension systems. | 3rd Jul 1924 | Box 25 \ 2 Scan063 | |
| The fitting, testing, and pricing terms for Houdaille suspensions on various car chassis. | 3rd Jul 1924 | Box 25 \ 2 Scan064 | |
| Continuation of a letter from The Houdaille Hydraulic Suspension Co. regarding their services and product workmanship. | 3rd Jul 1924 | Box 25 \ 2 Scan065 | |
| Hand-drawn diagram showing an end view of an axle casing with lugs for a 1922 model. | 29th Aug 1922 | Box 25 \ 2 Scan066 | |
| Letter from The Houdaille Hydraulic Suspension Co Ltd to Rolls Royce regarding a price reduction for hydraulic suspensions. | 29th Aug 1922 | Box 25 \ 2 Scan067 | |
| Letter from Houdaille Hydraulic Suspension Co. Ltd. following up on suspension tests and advocating for their standardisation. | 21th Oct 1922 | Box 25 \ 2 Scan068 | |
| Letter from The Houdaille Hydraulic Suspension Co., Ltd. enquiring about fitting components to a new Twenty model. | 28th Feb 1923 | Box 25 \ 2 Scan069 | |
| Cover note forwarding a communication from Houdaille Hydraulic Suspension Co. Ltd. regarding shock absorbers. | 28th Feb 1923 | Box 25 \ 2 Scan070 | |
| Letter from The Houdaille Hydraulic Suspension Co. Ltd. regarding pricing for suspensions and brackets. | 27th Feb 1923 | Box 25 \ 2 Scan071 | |
| Promotional booklet for Houdaille Hydraulic Shock Absorbers, including a publication on 'How Motoring Shocks Affect the Nervous System'. | 1st Jan 1923 | Box 25 \ 2 Scan072 | |
| Urgent request to settle the account for Houdaille Suspension shock absorbers. | 10th May 1923 | Box 25 \ 2 Scan073 | |
| Requesting the return of two pairs of Houdaille Shock Absorbers to the makers. | 10th May 1923 | Box 25 \ 2 Scan074 | |
| Letter from Houdaille Hydraulic Suspensions regarding fitting their shock absorbers to cars, referencing the Prince of Wales's vehicle. | 29th Oct 1923 | Box 25 \ 2 Scan075 | |
| Promotional letter from Houdaille Hydraulic Suspension Co. regarding their shock absorbers. | 26th Oct 1923 | Box 25 \ 2 Scan076 | |
| Customer feedback letter expressing thanks for an offer and praising the performance of a suspension system. | 26th Oct 1923 | Box 25 \ 2 Scan077 | |
| Letter discussing fitting parts to the rear springs of a car and inquiring about local accommodation for a family visit. | 23th Nov 1923 | Box 25 \ 2 Scan078 | |
| Letter from Houdaille Hydraulic Suspension Co. Ltd. enclosing a customer testimonial for their shock absorbers. | 23th Nov 1923 | Box 25 \ 2 Scan079 | |
| Testimonial letter from R. J. Hope regarding the performance of Houdaille Shock Absorbers on a Rolls-Royce. | 22th Nov 1923 | Box 25 \ 2 Scan080 | |
| Proposing to decline an offer from the Houdaille Company for the standardisation of their shock absorbers. | 14th Dec 1923 | Box 25 \ 2 Scan081 | |
| Letter from The Houdaille Hydraulic Suspension Co. Ltd. quoting a price for their hydraulic shock absorbers for standardisation. | 10th Dec 1923 | Box 25 \ 2 Scan082 | |
| Page 2 of a document from The Houdaille Hydraulic Suspension Co. Ltd. regarding the efficiency of their shock absorbers. | 22th Feb 1924 | Box 25 \ 2 Scan083 | |
| Potential testing and adoption of Houdaille Hydraulic Suspension systems. | 22th Feb 1924 | Box 25 \ 2 Scan084 | |
| ROY regarding a communication from Houdaille and a query about acquiring a set for an experimental or shop car. | 3rd Mar 1924 | Box 25 \ 2 Scan085 | |
| Letter from Houdaille Hydraulic Suspensions encouraging Rolls Royce to test their shock absorbers. | 28th Feb 1924 | Box 25 \ 2 Scan086 | |
| Letter from The Houdaille Hydraulic Suspension Co. Ltd. discussing the performance and reliability of their suspension systems. | 20th Feb 1924 | Box 25 \ 2 Scan087 | |
| Letter to Houdaille Hydraulic Suspension Co. Ltd. declining to test their shock absorbers for standardisation. | 27th Feb 1924 | Box 25 \ 2 Scan088 | |
| From Roy discussing the trial of modified Houdaille Shock Absorbers. | 20th Jul 1925 | Box 25 \ 2 Scan089 | |
| Letter from Houdaille Hydraulic Suspension Co. Ltd. discussing a new hydraulic shock absorber model. | 15th Jul 1920 | Box 25 \ 2 Scan090 | |
| Instructions on the maintenance and features of shock absorbers and connecting rods. | 8th Aug 1925 | Box 25 \ 2 Scan091 | |
| Trial of a hydraulic shock absorber to address high-speed steering wobbles. | 8th Aug 1925 | Box 25 \ 2 Scan092 | |
| Tests to eliminate high-speed steering wobbles using hydraulic dampers and Houdaille shock absorbers. | 27th Aug 1925 | Box 25 \ 2 Scan093 | |
| Testing shock absorbers, comparing standard units with Houdaille dampers, and further trials with balloon tyres. | 1st Aug 1925 | Box 25 \ 2 Scan094 | |
| Determining the effects of synchronized out-of-balance front wheels on wobbles. | 1st Aug 1925 | Box 25 \ 2 Scan095 | |
| Requesting tools and parts to fit Houdaille shock absorbers to a Morris-Cowley car for examination. | 29th Aug 1925 | Box 25 \ 2 Scan096 | |
| The reliability and effectiveness of Houdaille hydraulic dampers for steering. | 1st Sep 1925 | Box 25 \ 2 Scan097 | |
| Letter from The Houdaille Hydraulic Suspension Co Ltd confirming the dispatch of Berk-shire shock absorbers and brackets for a Phantom model. | 4th Sep 1925 | Box 25 \ 2 Scan098 | |
| Letter regarding the dispatch and fitting instructions for new British-made Berk-shire Hydraulic Shock Absorbers for testing on a Phantom Model. | 4th Sep 1925 | Box 25 \ 2 Scan099 | |
| Letter from Houdaille Hydraulic Suspension Co. Ltd. about fitting shock absorbers to a 40-50 HP model. | 4th Sep 1925 | Box 25 \ 2 Scan100 | |
| Blueprint diagram for adapting a Berkshire hydraulic suspension to a 40/50 chassis without further drilling. | 4th Sep 1925 | Box 25 \ 2 Scan101 | |
| Blueprint for adapting a Berkshire Hydraulic Suspension to a 40/50 chassis. | 4th Sep 1925 | Box 25 \ 2 Scan102 | |
| Blueprint for adapting a Berkshire M/S to a 40/50 model by altering the existing rear bracket. | 4th Sep 1925 | Box 25 \ 2 Scan103 | |
| Blueprint for adapting a Berkshire hydraulic suspension to a 40/50 model by altering the existing rear bracket. | 1st Sep 1925 | Box 25 \ 2 Scan104 | |
| Testing of Berkshire hydraulic shock dampers from the English Houdaille Co. | 1st Sep 1925 | Box 25 \ 2 Scan105 | |
| Letter from The Houdaille Hydraulic Suspension Co Ltd regarding the despatch of shock absorbers and brackets. | 7th Sep 1925 | Box 25 \ 2 Scan106 | |
| Letter confirming the dispatch of shock absorbers and brackets for a Phantom model. | 8th Sep 1925 | Box 25 \ 2 Scan107 | |
| Requesting the return of Berkshire shock absorbers to be replaced with the latest Houdaille pattern. | 11th Sep 1925 | Box 25 \ 2 Scan108 | |
| Return of two Berkshire shock absorbers to the makers. | 11th Sep 1925 | Box 25 \ 2 Scan109 | |
| New experimental Phantom hydraulic shock damper for the front axle. | 1st Sep 1925 | Box 25 \ 2 Scan110 | |
| Despatch of Houdaille Front Shock Absorbers and improved washers. | 14th Sep 1925 | Box 25 \ 2 Scan111 | |
| Solutions for high and low-speed steering wobbles and the development of new shock dampers. | 14th Sep 1925 | Box 25 \ 2 Scan112 | |
| Testing and setup of various shock dampers for Phantom and 20 HP models. | 9th Sep 1925 | Box 25 \ 2 Scan113 | |
| Bump test performed on Derihon, Houdaille, and Berkshire brand shock absorbers. | 25th Sep 1925 | Box 25 \ 2 Scan114 | |
| The performance and comparison of different types of shock absorbers, focusing on overheating and oil leaks. | 14th Jan 1926 | Box 25 \ 2 Scan115 | |
| Returning and ordering different types of hydraulic shock absorbers. | 14th Jan 1926 | Box 25 \ 2 Scan116 | |
| Design flaws of Houdaille type shock absorbers and the development of a new hydraulic type. | 2nd Feb 1926 | Box 25 \ 2 Scan117 | |
| Full description of the Houdaille Hydraulic Suspension system, a self-compensating shock and recoil absorber for motor cars. | 21th May 1921 | Box 25 \ 2 Scan118 | |
| Brochure for the Houdaille patented hydraulic, compensating & recuperative suspension system. | 21th May 1921 | Box 25 \ 2 Scan119 | |
| Promotional leaflet featuring customer testimonials and illustrations for Houdaille Hydraulic Shock Absorbers. | 18th May 1920 | Box 25 \ 2 Scan120 | |
| Compilation of private, trade, and press testimonials regarding the Houdaille hydraulic suspension system. | 18th May 1920 | Box 25 \ 2 Scan121 | |
| Correspondence with The Houdaille Hydraulic Suspension Company about shock absorbers. | 16th Oct 1926 | Box 25 \ 2 Scan122 | |
| Letter from Houdaille Hydraulic Suspension Co. Ltd. regarding a new Commercial model suspension. | 13th Oct 1926 | Box 25 \ 2 Scan123 | |
| Promotional leaflet for Houdaille Hydraulic Shock Absorbers for commercial vehicles, detailing their function and application. | 13th Oct 1926 | Box 25 \ 2 Scan124 | |
| Advertising leaflet for Houdaille Hydraulic Shock Absorbers for Commercial Vehicles, including a free trial offer. | 16th Oct 1926 | Box 25 \ 2 Scan125 | |
| Letter to The Houdaille Hydraulic Suspension Co. Ltd declining to test their new commercial model hydraulic suspension. | 16th Oct 1926 | Box 25 \ 2 Scan126 | |
| Letter regarding Houdaille Shock Absorbers, contrasting the American and French manufactured designs. | 2nd Feb 1927 | Box 25 \ 2 Scan127 | |
| The performance of American Houdaille shock absorbers compared to French instruments on various cars. | 2nd Feb 1927 | Box 25 \ 2 Scan128 | |
| Letter from Houde Engineering comparing American-built and French-built Houdaille instruments. | 31th Jan 1927 | Box 25 \ 2 Scan129 | |
| Comparison of the design and operation of French and American shock absorber instruments. | 31th Jan 1927 | Box 25 \ 2 Scan130 | |
| To Mr. Maurice Olley detailing the reliability and advantages of American-built instruments over French ones. | 31th Jan 1927 | Box 25 \ 2 Scan131 | |
| The concluding page of a letter to Mr. Maurice Olley from the Houde Engineering Corp. | 16th Feb 1927 | Box 25 \ 2 Scan132 | |
| Requesting a pair of Houdaille shock absorbers to test their effect on high-speed wobbles. | 16th Feb 1927 | Box 25 \ 2 Scan133 | |
| From F.H.R. to Mr. Swetnam requesting a trial drawing to increase crankshaft rigidity. | 15th Jun 1910 | Box 25 \ 3 Scan001 | |
| Departmental memo discussing methods to reduce vibrations in a six-cylinder engine. | 2nd Nov 1910 | Box 25 \ 3 Scan002 | |
| Departmental memo discussing the cause of engine rattles and vibrations, attributing them to a heavier paper wheel. | 2nd Nov 1910 | Box 25 \ 3 Scan003 | |
| Exchange regarding the preparation of a demonstration car for a show to exhibit the absence of crankshaft vibration. | 4th Nov 1910 | Box 25 \ 3 Scan004 | |
| Letter discussing car vibrations, competitor analysis, and the need for a forward move before an exhibition. | 7th Nov 1910 | Box 25 \ 3 Scan005 | |
| Page two of a letter discussing ideas and plans in anticipation of a show. | 7th Nov 1910 | Box 25 \ 3 Scan006 | |
| Test results for engine rattles at various speeds and the effect of fitting stinger stops. | 24th Sep 1920 | Box 25 \ 3 Scan007 | |
| Engine vibration test performed on a dynamometer. | 29th Nov 1910 | Box 25 \ 3 Scan008 | |
| Departmental memo about crankshaft vibrations and the performance of an engine with a heavy front flywheel. | 13th Dec 1910 | Box 25 \ 3 Scan009 | |
| Record of a vibration test on a '1400 type' engine, listing engine RPM, MPH, and observed vibration levels. | 25th Jan 1939 | Box 25 \ 3 Scan010 | |
| The 1100 type engine. | 2nd Feb 1911 | Box 25 \ 3 Scan011 | |
| Note on testing balance weights fitted to a crankshaft. | 2nd Feb 1911 | Box 25 \ 3 Scan012 | |
| Increasing crankshaft rigidity for the 1600 car to reduce vibration and increase power. | 23th Mar 1911 | Box 25 \ 3 Scan013 | |
| Enclosing notes on the damping of crankshaft vibrations. | 26th Apr 1911 | Box 25 \ 3 Scan014 | |
| Deflexion test results for an aero crankshaft with thin webs and standard size pins. | 13th May 1911 | Box 25 \ 3 Scan015 | |
| Test results for engine rattles on an extra strong crankshaft type. | 13th Jun 1911 | Box 25 \ 3 Scan016 | |
| Test notes on engine rattles related to a special crankshaft ferodo with clichered webs. | 14th Jun 1911 | Box 25 \ 3 Scan017 | |
| Test note on 'bar rattles' and chatter experienced at various speeds and conditions. | 14th Jun 1911 | Box 25 \ 3 Scan018 | |
| Construction of universal joints and shafts to investigate the cause of high-speed engine vibrations affecting the carburettor needle. | 19th Jun 1911 | Box 25 \ 3 Scan019 | |
| Engine test notes regarding 'thuds' and crankshaft distortion. | 20th Jun 1911 | Box 25 \ 3 Scan020 | |
| Experiments on a standard engine test plate investigating crankshaft whip and thuds. | 20th Jun 1911 | Box 25 \ 3 Scan021 | |
| Notes on engine rattles felt on the chassis due to crankshaft periods, with test results. | 20th Jun 1911 | Box 25 \ 3 Scan022 | |
| Test notes on a large heavy external slitter drive, detailing issues with rumbles, rattles and luntiness. | 24th Jan 1911 | Box 25 \ 3 Scan023 | |
| Engine rattles and the effectiveness of a slipper drive. | 12th Oct 1911 | Box 25 \ 3 Scan024 | |
| Vibration and rattle experiments on engine X634 with an old type 'Coronation' crankshaft. | 23th Sep 1914 | Box 25 \ 3 Scan025 | |
| Record of experiments testing different engine piston weights and flywheel configurations. | 23th Sep 1911 | Box 25 \ 3 Scan026 | |
| Over-running noise from the coupling between the engine and gearbox, suggesting design improvements. | 17th Nov 1911 | Box 25 \ 3 Scan027 | |
| Page discussing the effect of vacuum in the induction pipe on coupling rattle. | 19th Nov 1911 | Box 25 \ 3 Scan028 | |
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