| Description | Date | Identifier | |
| Page discussing a jack unfolding at high speed and the necessity of an external clip. | 20th Sep 1933 | Box 26 \ 3 Scan259 | |
| Trouble with D.W.S. Jacks turning on the axle and proposals for inspection and improved clamping. | 20th Sep 1933 | Box 26 \ 3 Scan260 | |
| Correspondence regarding the examination and testing of new improved D.W.S. jacks with safety clips. | 25th Sep 1933 | Box 26 \ 3 Scan261 | |
| Investigation of fitting keys or dowels to locate brackets for D.W.S. jacks on the 40/50 HP chassis rear axle. | 26th Sep 1933 | Box 26 \ 3 Scan262 | |
| The incorrect fitting of D.W.S. jacks and clarification on their correct operation and identification. | 27th Oct 1933 | Box 26 \ 3 Scan263 | |
| Letter to Donald Sessions & Co. Ltd. regarding a two-speed jack handle and RR.50 alloy for gearbox castings. | 27th Oct 1933 | Box 26 \ 3 Scan264 | |
| Letter from Donald Sessions & Company Ltd. regarding a 2-speed handle for trial and a future quote for jacking sets. | 30th Oct 1933 | Box 26 \ 3 Scan265 | |
| Whether to return a D.W.S. Jack to the makers or to re-stamp it instead. | 11th Nov 1933 | Box 26 \ 3 Scan266 | |
| Incorrectly fitted and stamped D.W.S. Jack on a 40/50 HP Chassis. | 11th Nov 1933 | Box 26 \ 3 Scan267 | |
| Return of a D.W.S. Jack to its makers and communication with Mr. Sessions. | 13th Nov 1933 | Box 26 \ 3 Scan268 | |
| Letter to Donald Sessions & Co. Ltd. regarding a wrongly stamped jack and a request for a replacement. | 13th Nov 1933 | Box 26 \ 3 Scan269 | |
| The return of a D.W.S. Jack due to an unfortunate error. | 3rd Nov 1933 | Box 26 \ 3 Scan270 | |
| Arranging for a faulty D.W.S. Jack to be sent to Despatch Stores for return and replacement. | 13th Nov 1933 | Box 26 \ 3 Scan271 | |
| The fitting of Lake & Elliott jack pads to the Bentley chassis. | 14th Nov 1944 | Box 26 \ 3 Scan272 | |
| Suitability and standardisation of jacks for the 20/25 HP car. | 16th Nov 1933 | Box 26 \ 3 Scan273 | |
| Cost and supply options for a new lighter type of jack for the 20/25 HP cars. | 7th Sep 1933 | Box 26 \ 3 Scan274 | |
| Letter from a supplier, Donald Sessions & Co Ltd, regarding incorrectly marked 'Near-side' and 'Off-side' jacks and proposed solutions. | 16th Nov 1933 | Box 26 \ 3 Scan275 | |
| Letter from a supplier regarding the despatch of an experimental 2-speed jack handle for testing and proposed production improvements. | 16th Nov 1933 | Box 26 \ 3 Scan276 | |
| Incorrectly stamped D.W.S. Jacks and the prevention of incorrect fitting. | 17th Nov 1933 | Box 26 \ 3 Scan277 | |
| Letter to S. Smith & Sons Ltd. inquiring about the progress of the Jackall jacking system for the Phantom II car. | 17th Nov 1933 | Box 26 \ 3 Scan278 | |
| Letter to Donald Sessions & Co. Ltd regarding a two-speed jack handle and the identification marking of jacks. | 17th Nov 1933 | Box 26 \ 3 Scan279 | |
| Cost implication of incorporating a special 2-speed handle for D.W.S. Permanent Jacks. | 17th Nov 1933 | Box 26 \ 3 Scan280 | |
| Letter from S. Smith & Sons regarding the completion and installation of a Jackall system on a Phantom II chassis. | 18th Nov 1933 | Box 26 \ 3 Scan281 | |
| Arrangements to fit a new jacking set from S.Smith & Sons Ltd to a 40/50 HP chassis. | 21th Nov 1933 | Box 26 \ 3 Scan282 | |
| Incorrectly marked 'Near-side' and 'Off-side' jacks from a supplier. | 22th Nov 1933 | Box 26 \ 3 Scan283 | |
| Letter confirming an appointment to fit a Jackall system to a Phantom car. | 24th Nov 1933 | Box 26 \ 3 Scan284 | |
| Letter from S. Smith & Sons regarding the fitment of a Jackall Jack system to a Phantom II chassis. | 24th Nov 1933 | Box 26 \ 3 Scan285 | |
| Letter from S. Smith & Sons regarding a Phantom II chassis and the fitting of a Control Box. | 27th Nov 1933 | Box 26 \ 3 Scan286 | |
| Improved two-speed jack handle for the Phantom II model. | 28th Nov 1933 | Box 26 \ 3 Scan287 | |
| Letter from the Experimental Department to Donald Sessions & Co. Ltd. detailing defects found in a set of D.W.S. jacks. | 28th Nov 1933 | Box 26 \ 3 Scan288 | |
| Letter of complaint to Donald Sessions & Co. Ltd. regarding the substandard quality of car jacks. | 28th Nov 1933 | Box 26 \ 3 Scan289 | |
| D.W.S. Jack Handle being sent for inspection and testing. | 28th Nov 1933 | Box 26 \ 3 Scan290 | |
| Removal of unsatisfactory D.W.S. Jacks from Chassis GHA-35 and noting issues with the drive shafts. | 28th Nov 1933 | Box 26 \ 3 Scan291 | |
| Letter from a supplier, Donald Sessions & Company, regarding issues with Mark II Jacks and arranging a visit to resolve them. | 29th Nov 1933 | Box 26 \ 3 Scan292 | |
| Fit and operational issues of a D.W.S. jack handle for the Phantom II and other models. | 30th Nov 1933 | Box 26 \ 3 Scan293 | |
| New D.W.S. jack handle for the Phantom II having a fitting issue and a proposed solution. | 30th Nov 1933 | Box 26 \ 3 Scan294 | |
| Fitting jacks as a standard feature on the 20/25 HP car model after a 10,000-mile test. | 4th Dec 1933 | Box 26 \ 3 Scan295 | |
| Letter from supplier Donald Sessions & Company Ltd. regarding defective Mark II Jacks and proposed modifications. | 4th Dec 1933 | Box 26 \ 3 Scan296 | |
| Letter from a supplier detailing specifications and proposed modifications for vehicle jacks. | 4th Dec 1933 | Box 26 \ 3 Scan297 | |
| Letter from Donald Sessions & Company Ltd. regarding the production and design of a Mark III Jack for the 40/50 Chassis. | 4th Dec 1935 | Box 26 \ 3 Scan298 | |
| Letter to Donald Sessions & Co. Ltd. regarding the standardization requirements for car jacks. | 5th Dec 1933 | Box 26 \ 3 Scan299 | |
| List of specifications and notes regarding the design, finish, and supply of car jacks. | 5th Dec 1933 | Box 26 \ 3 Scan300 | |
| Incompatibility of a new double-geared jack handle with existing car jacks and potential solutions. | 5th Dec 1933 | Box 26 \ 3 Scan301 | |
| Letter regarding modifications required for fitting Jackall Hydraulic Jacks to a Phantom II car. | 5th Dec 1933 | Box 26 \ 3 Scan302 | |
| Letter to Donald Sessions & Co Ltd. regarding the delayed testing of a new double-geared handle due to incompatible jacks. | 6th Dec 1933 | Box 26 \ 3 Scan303 | |
| Letter regarding difficulties fitting hydraulic jacks to an experimental Phantom II and arranging its collection. | 6th Dec 1933 | Box 26 \ 3 Scan304 | |
| Sourcing a two-geared handle suitable for D.W.S. jacks. | 6th Dec 1933 | Box 26 \ 3 Scan305 | |
| Telegram to Messrs Smith & Sons Ltd regarding the urgent collection of Jackall Hydraulic Jacks. | 6th Dec 1933 | Box 26 \ 3 Scan306 | |
| Request for information regarding jacks for the 20/25 HP model. | 6th Dec 1933 | Box 26 \ 3 Scan307 | |
| Letter from Donald Sessions & Co Ltd regarding a modified Mark II Jack specification for the 20/25 HP car. | 6th Dec 1933 | Box 26 \ 3 Scan308 | |
| Completion of a 10,000-mile test for 20/25 HP Jacks. | 7th Dec 1933 | Box 26 \ 3 Scan309 | |
| Letter from Donald Sessions & Co. Ltd. regarding fitting issues with a new two-speed Jack Handle and the proposed alteration. | 7th Dec 1933 | Box 26 \ 3 Scan310 | |
| The holding and potential return of a jack handle to Sessions. | 7th Dec 1933 | Box 26 \ 3 Scan311 | |
| Instructions for marking and testing D.W.S. Jacks on the Phantom II. | 8th Dec 1933 | Box 26 \ 3 Scan312 | |
| Instructions for testing D.W.S. Jacks for the 40/50 model for fitting position. | 8th Dec 1933 | Box 26 \ 3 Scan313 | |
| Letter from S. Smith & Sons regarding a delay and issues with fitting Hydraulic Jacks to a Phantom II. | 8th Dec 1933 | Box 26 \ 3 Scan314 | |
| Arranging for Messrs Sessions to collect and modify a jack handle from Lillie Hall. | 9th Dec 1933 | Box 26 \ 3 Scan315 | |
| Letter from S. Smith & Sons regarding the completion and fitting of a Jackall Jacking System for a Phantom II. | 12th Dec 1933 | Box 26 \ 3 Scan316 | |
| Letter to S. Smith & Sons Ltd. arranging the fitting of a pump unit for the Jackall Jacking System to a Phantom II. | 14th Dec 1933 | Box 26 \ 3 Scan317 | |
| Letter from S. Smith & Sons regarding the fitting of 'Jackall' jacks to a 40/50 chassis. | 18th Dec 1933 | Box 26 \ 3 Scan318 | |
| Cover letter enclosing correspondence from S. Smith & Sons and requesting an opinion on Jackall Jacks. | 19th Dec 1933 | Box 26 \ 3 Scan319 | |
| Letter from S.Smith & Sons promoting their 'Jackall' hydraulic jacking system and addressing objections to its installation. | 18th Dec 1933 | Box 26 \ 3 Scan320 | |
| Letter concerning the fitting of Jackall Hydraulic 4-wheel Jacks to a car sold to a Mr. G. Rose. | 19th Dec 1933 | Box 26 \ 3 Scan321 | |
| Internal memorandum inquiring about the commencement date for D.W.S. jacks as a standard feature on the 20/25 HP chassis. | 19th Dec 1938 | Box 26 \ 3 Scan322 | |
| Testing, supply and standardisation of HE jacks for the 20/25 HP model. | 30th Dec 1933 | Box 26 \ 3 Scan323 | |
| Letter from the Experimental Dept. requesting a meeting to discuss D.W.S. Jacks for the 20/25 HP model. | 20th Dec 1933 | Box 26 \ 3 Scan324 | |
| Letter from the Experimental Department to The Donald Sessions Co. Ltd. to arrange a meeting about D.W.S. Jacks for the 20/25 HP model. | 20th Dec 1933 | Box 26 \ 3 Scan325 | |
| The planned collection and testing of Jackall Jacks on the 20-EX car. | 20th Dec 1933 | Box 26 \ 3 Scan326 | |
| Letter to S. Smith & Sons regarding the collection of a car and testing of newly fitted lighter type Jacks. | 20th Dec 1933 | Box 26 \ 3 Scan327 | |
| Testing, standardisation and supply of jacks for the 20/25 HP model. | 20th Dec 1933 | Box 26 \ 3 Scan328 | |
| Letter from Donald Sessions & Company Ltd. arranging a meeting to discuss D.W.S. Jacks for the 20/25 HP model. | 21th Dec 1933 | Box 26 \ 3 Scan329 | |
| Introduction and testing of jacks for the 20/25 HP model. | 21th Dec 1933 | Box 26 \ 3 Scan330 | |
| Brief memo acknowledging a previous communication regarding Jackall Jacks and awaiting a further report. | 22th Dec 1933 | Box 26 \ 3 Scan331 | |
| Confirming the testing of Jackall Jacks on car 20-EX and enclosing a report for Smith & Sons. | 27th Dec 1933 | Box 26 \ 3 Scan332 | |
| Letter to S. Smith & Sons regarding testing of lightweight Jackall Jacks fitted to a Phantom Car, which were found to be not strong enough. | 26th Dec 1933 | Box 26 \ 3 Scan333 | |
| Collapsed N/S jack and a proposal for fitting a heavier replacement. | 28th Dec 1933 | Box 26 \ 3 Scan334 | |
| Letter to The Donald Sessions Co. Ltd. regarding the rescheduling of a visit for an indisposed Mr. Sessions. | 28th Dec 1933 | Box 26 \ 3 Scan335 | |
| Letter from S. Smith & Sons providing weight figures for a sample Jackall Hydraulic Jacking Set. | 28th Dec 1933 | Box 26 \ 3 Scan336 | |
| Letter from S. Smith & Sons regarding the specifications and options for a car jacking system. | 28th Dec 1933 | Box 26 \ 3 Scan337 | |
| Letter from S. Smith & Sons regarding a damaged rear wing during testing. | 28th Dec 1933 | Box 26 \ 3 Scan338 | |
| 'Jackall Jacks' and awaiting a report on a stronger type of jack. | 29th Dec 1933 | Box 26 \ 3 Scan339 | |
| Letter from S. Smith & Sons regarding criticism of their Jackall Jack System fitted to a test car. | 30th Dec 1933 | Box 26 \ 3 Scan340 | |
| Letter from S. Smith & Sons regarding the supply and modification of car jacks following a collapse. | 30th Dec 1933 | Box 26 \ 3 Scan341 | |
| Outlining tests for footbrake linings using combinations of Ferodo and cast iron. | 20th Sep 1912 | Box 26 \ 4 Scan001 | |
| The performance of a Ferodo lined foot-brake, noting issues with smell, smoke, and adjustments. | 4th Oct 1912 | Box 26 \ 4 Scan002 | |
| Test report on Ferodo lined foot-brake shoes, detailing performance, issues and solutions. | 26th Dec 1919 | Box 26 \ 4 Scan003 | |
| Testing Ferodo brake linings, noting that while they last longer than cast iron, they cause the brake drums to go out of true. | 10th Jun 1912 | Box 26 \ 4 Scan004 | |
| Instructions discussing overheating issues with Ferodo brake material and a proposal to test a new compressed material to improve silence and smoothness. | 10th Jun 1912 | Box 26 \ 4 Scan005 | |
| The wear of Ferodo footbrake lining from chassis 2100E after road testing. | 11th Dec 1912 | Box 26 \ 4 Scan006 | |
| Page from a document, numbered 2, stating 'rather an important point.'. | 30th Jun 1914 | Box 26 \ 4 Scan007 | |
| The urged delivery of Ferodo brake liners and the subsequent reply explaining the delay. | 30th Jun 1914 | Box 26 \ 4 Scan008 | |
| Harsh footbrake on Mrs Joicey's car (2181) and a suggestion to use Feroda lining. | 1st May 1914 | Box 26 \ 4 Scan009 | |
| The performance of 5% lead bronze rear foot brake liners, detailing issues with noise and power at different speeds. | 2nd Jul 1914 | Box 26 \ 4 Scan010 | |
| Solutions for overheating rear brake drums and proposing trials of new materials and designs. | 3rd Jul 1914 | Box 26 \ 4 Scan011 | |
| Instructions for fitting Ferodo brake liners to straps by piercing holes instead of drilling. | 3rd Jul 1914 | Box 26 \ 4 Scan012 | |
| Testing die-pressed Ferodo brake material on rear foot brakes, comparing its heat expansion properties to cast iron and bronze shoes. | 10th Jul 1914 | Box 26 \ 4 Scan013 | |
| Brake drum contraction, cooling efficiency, and potential improvements using Ferodo material. | 12th May 1914 | Box 26 \ 4 Scan014 | |
| Telegram from Royce regarding modifications and tests for radiators, suspension, and brakes. | 14th Jul 1914 | Box 26 \ 4 Scan015 | |
| Instruction sheet regarding issues with die-pressed Ferodo brake material and a request to order higher quality replacements. | 15th Jul 1914 | Box 26 \ 4 Scan016 | |
| Telegram from Mr. Royce regarding the comparative testing of Ferodo brake linings. | 20th Jul 1914 | Box 26 \ 4 Scan017 | |
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