| Description | Date | Identifier | |
| The design difficulties and dimensional requirements for hydraulic jacks. | 28th Feb 1930 | Box 26 \ 3 Scan059 | |
| The limitations of the standard Dunlop Jack and the reasons for not favoring the Jack-all system. | 28th Feb 1930 | Box 26 \ 3 Scan060 | |
| Requesting comments on an attached memo regarding 4-Wheel Jacks for GWP-14 Swinton. | 12th May 1930 | Box 26 \ 3 Scan061 | |
| Poor fitting of 4-wheel hydraulic jacks and concerns over potential damage. | 9th May 1930 | Box 26 \ 3 Scan062 | |
| Jenks Jacks, attaching related correspondence and arranging for a set to be fitted to a 40/50 HP chassis. | 26th Jan 1931 | Box 26 \ 3 Scan063 | |
| Fitting of 'Jenks Jacks' and the associated challenges with modern bodywork. | 23th Jan 1931 | Box 26 \ 3 Scan064 | |
| Letter from H. Jenks Limited regarding the dispatch of jacks for the 20/25 and Phantom II models. | 20th Jan 1931 | Box 26 \ 3 Scan065 | |
| Test report and evaluation of 'Jenks Jacks' for potential use on cars, outlining advantages and disadvantages. | 3rd Feb 1931 | Box 26 \ 3 Scan066 | |
| Sending jacks for examination and considering a modified fixing and locking scheme to the axle. | 3rd Feb 1931 | Box 26 \ 3 Scan067 | |
| Brochure for 'Jenks Jacks' which are permanently fitted. | 19th Mar 1931 | Box 26 \ 3 Scan068 | |
| Test report and analysis of a hydraulic jack for a Phantom II car, made by Eversure Accessories Ltd. | 19th Mar 1931 | Box 26 \ 3 Scan069 | |
| The performance of improved pattern Jenks Jacks fitted to a Phantom II car, noting a required modification. | 30th Apr 1931 | Box 26 \ 3 Scan070 | |
| Suitability of an Eversure hydraulic jack for a Phantom II car, detailing its dimensions and comparing it to a Dunlop jack. | 28th Apr 1931 | Box 26 \ 3 Scan071 | |
| Comparison between the Eversure and Dunlop hydraulic jacks, concluding to continue with the Dunlop. | 4th May 1931 | Box 26 \ 3 Scan072 | |
| List of modifications for the Kestrel 39 Type Test Engine after an unsuccessful run. | 6th Jul 1931 | Box 26 \ 3 Scan073 | |
| Type test for the Buzzard M.S.13 Evaporatively Cooled engine, including camshaft and reduction gear fittings. | 3rd Nov 1931 | Box 26 \ 3 Scan074 | |
| Suggesting a trial of the 'Jackall' 4-wheel hydraulic jacking system. | 13th Nov 1931 | Box 26 \ 3 Scan075 | |
| Requesting the acquisition and testing of 'Jackall' four-wheel jacks for the Phantom II model. | 17th Nov 1931 | Box 26 \ 3 Scan076 | |
| Fitting of a Jackall Hydraulic Four wheel System to a Phantom II chassis. | 17th Nov 1931 | Box 26 \ 3 Scan077 | |
| Customer testimonial letter for 'Jackall' Hydraulic Jacks fitted to a Lagonda Speed Model. | 19th Nov 1931 | Box 26 \ 3 Scan078 | |
| Promotional leaflet for the Jackall four-wheel jacking system. | 19th Nov 1931 | Box 26 \ 3 Scan079 | |
| Advertisement for the 'JACKALL' four-wheel jacking system, featuring testimonials from famous racing drivers. | 19th Nov 1931 | Box 26 \ 3 Scan080 | |
| Blueprint of the Jackall assembly for a Phantom II vehicle. | 23th Mar 1936 | Box 26 \ 3 Scan081 | |
| Blueprint for the Jackall Assembly No. 108, showing front and rear fittings. | 23th Mar 1936 | Box 26 \ 3 Scan082 | |
| Instructional blueprint for the fitting and use of four-wheel jacks. | 17th Nov 1931 | Box 26 \ 3 Scan083 | |
| Request to obtain and test a set of 'Jackall' four-wheel jacks for the Phantom 11, with special Duralumin fittings. | 17th Nov 1931 | Box 26 \ 3 Scan084 | |
| Inquiry to Donald Sessions & Co. Ltd. about their D.W.S. Mechanical Four-wheel jacking system for the Phantom II car. | 19th Nov 1931 | Box 26 \ 3 Scan085 | |
| Enquiries into different types of vehicle jacking systems. | 19th Nov 1931 | Box 26 \ 3 Scan086 | |
| Letter from Donald Sessions & Company Ltd. regarding a demonstration of their D.W.S. Permanent Mechanical Jacking System. | 20th Nov 1931 | Box 26 \ 3 Scan087 | |
| Letter from Donald Sessions & Company Ltd. arranging a meeting in Derby. | 26th Nov 1931 | Box 26 \ 3 Scan088 | |
| Letter to Messrs S. Smith & Sons regarding an order to fit Jackall Jacks to a Phantom II car. | 30th Nov 1931 | Box 26 \ 3 Scan089 | |
| Comparing the hydraulic Jackall system with the mechanical D.W.S. four-wheel jacking system. | 3rd Dec 1931 | Box 26 \ 3 Scan090 | |
| Letter from Donald Sessions & Company Ltd. proposing their D.W.S. Jacking System for fitting to cars. | 3rd Dec 1931 | Box 26 \ 3 Scan091 | |
| Letter from Donald Sessions & Company Ltd. requesting blueprints for rear axle and spring mountings. | 3rd Dec 1931 | Box 26 \ 3 Scan092 | |
| Article reprinted from 'The Autocar' describing the D.W.S. permanently fitted four-wheel jack system. | 9th Oct 1931 | Box 26 \ 3 Scan093 | |
| From Sg. to Hs. regarding the ordering of a D.W.S. scheme for Four Wheel Jacking Systems over a hydraulic option. | 4th Dec 1931 | Box 26 \ 3 Scan094 | |
| Approval and pricing for fitting D.W.S. jacks to an experimental Phantom II car. | 7th Dec 1931 | Box 26 \ 3 Scan095 | |
| Letter regarding fitting the D.W.S. Jacking System to the Phantom II and 25hp models. | 10th Dec 1931 | Box 26 \ 3 Scan096 | |
| Letter from Donald Sessions & Company Ltd. regarding the fitting of D.W.S. jacks to an experimental Phantom II. | 10th Dec 1932 | Box 26 \ 3 Scan097 | |
| Letter from Donald Sessions & Company Ltd. confirming an order for a set of D.W.S. Jacks. | 10th Dec 1931 | Box 26 \ 3 Scan098 | |
| Hand-drawn cross-section of a shackle damper and rear spring assembly. | 10th Dec 1931 | Box 26 \ 3 Scan099 | |
| Drawing detailing modifications and dimensions for a specific mechanical part, F.79628. | 10th Dec 1931 | Box 26 \ 3 Scan100 | |
| Drawing showing side and cross-section views of a jacking point for a structural beam. | 10th Dec 1931 | Box 26 \ 3 Scan101 | |
| Drawing detailing modifications to part F.79628 to accommodate a jack. | 12th Dec 1931 | Box 26 \ 3 Scan102 | |
| Query regarding an invoice from S. Smith & Sons for supplying and fitting a set of Jackall Four Wheel Jacks. | 12th Dec 1931 | Box 26 \ 3 Scan103 | |
| The fitting of Jackall four wheel jacks and the subsequent release of the invoice for payment. | 14th Dec 1931 | Box 26 \ 3 Scan104 | |
| Price and potential discounts for a set of D.W.S. Jacks. | 15th Dec 1931 | Box 26 \ 3 Scan105 | |
| Letter to Donald Sessions & Co. Ltd. regarding suggestions for rear axle jack fittings. | 15th Dec 1931 | Box 26 \ 3 Scan106 | |
| Letter to S. Smith & Sons regarding testing of strengthened rear axle fittings and the Jackall system. | 18th Dec 1931 | Box 26 \ 3 Scan107 | |
| Letter from S. Smith & Sons regarding the despatch of reinforced brackets for a Jackall set. | 24th Dec 1931 | Box 26 \ 3 Scan108 | |
| Blueprint of the Jackall Assembly No. 108, detailing front and rear fitting instructions. | 6th Jan 1932 | Box 26 \ 3 Scan109 | |
| Letter to Donald Sessions & Co. Ltd. regarding the fitting of special brackets for D.W.S. Jacks. | 6th Jan 1932 | Box 26 \ 3 Scan110 | |
| Letter from Donald Sessions & Company Ltd confirming a car is ready for fitting with D.W.S. Jacks. | 7th Jan 1932 | Box 26 \ 3 Scan111 | |
| Letter from Donald Sessions & Company Ltd. confirming a date for fitting D.W.S. Jacks to a chassis. | 8th Jan 1932 | Box 26 \ 3 Scan112 | |
| Investigating a price discrepancy for Jackall Hydraulic Jacks. | 9th Jan 1932 | Box 26 \ 3 Scan113 | |
| Letter to Donald Sessions & Coy. Ltd. arranging for the fitting of D.W.S. jacks to a car. | 11th Jan 1931 | Box 26 \ 3 Scan114 | |
| Quotations and negative experiences with the Jackall lifting jack system. | 11th Jan 1932 | Box 26 \ 3 Scan115 | |
| Inquiry from Captain Wylie about a 'located jack' known as D.W.S. | 21th Jan 1932 | Box 26 \ 3 Scan116 | |
| Difficulties of jacking cars and providing an initial impression of two four-wheel jacking systems, starting with the Jackall system. | 21th Jan 1932 | Box 26 \ 3 Scan117 | |
| Operation and multiple disadvantages of a vehicle jacking system. | 21th Jan 1932 | Box 26 \ 3 Scan118 | |
| The D.W.S. mechanical jacking system and its fitment. | 21th Jan 1932 | Box 26 \ 3 Scan119 | |
| Comparison document detailing the specifications, weights, clearances, and costs of Jackall and D.W.S. jacking systems. | 21th Jan 1932 | Box 26 \ 3 Scan120 | |
| Blueprint detailing the D.W.S. Four Wheel Jacking System and its components. | 22th Jan 1932 | Box 26 \ 3 Scan121 | |
| The testing of D.W.S. four-wheel jack fittings on car 19-EX during a 10,000-mile test. | 26th Jan 1932 | Box 26 \ 3 Scan122 | |
| Instruction to transfer a set of D.W.S. Jacks from car 22-EX to 19-EX for a 10,000-mile test. | 28th Jan 1932 | Box 26 \ 3 Scan123 | |
| Letter from Donald Sessions & Company Ltd. regarding the fitting of D.W.S. Jacks to a 40/50 car and a misplaced sectioned Jack screw. | 5th Feb 1932 | Box 26 \ 3 Scan124 | |
| Letter to Donald Sessions & Co Ltd regarding issues with jacks fitted to an experimental car and a missing component. | 6th Feb 1932 | Box 26 \ 3 Scan125 | |
| Correspondence from a supplier regarding a defective jacking system handle and a lost sectioned screw. | 8th Feb 1932 | Box 26 \ 3 Scan126 | |
| Letter to Donald Session & Company Ltd. regarding the failure and unsuitability of car jacks and handles. | 9th Feb 1932 | Box 26 \ 3 Scan127 | |
| The operation of a car jack, proposing a revised handle ratio for better ground clearance. | 10th Feb 1932 | Box 26 \ 3 Scan128 | |
| Letter from Donald Sessions & Company Ltd. addressing issues with their D.W.S. Permanent Jacks. | 10th Feb 1932 | Box 26 \ 3 Scan129 | |
| Letter from Donald Sessions & Company Ltd. reporting on a test of their permanent jacks fitted to a Phantom II car. | 12th Feb 1932 | Box 26 \ 3 Scan130 | |
| Letter from Donald Sessions & Company Ltd. discussing issues with jacks and tyre sizes. | 12th Feb 1932 | Box 26 \ 3 Scan131 | |
| Letter concerning the failure of a D.W.S. jacking system and arranging a demonstration. | 13th Feb 1932 | Box 26 \ 3 Scan132 | |
| Letter from Donald Sessions & Company Ltd. regarding a proposed visit to investigate issues with D.W.S. Jacks fitted to a car. | 18th Feb 1932 | Box 26 \ 3 Scan133 | |
| Letter to Messrs. Donald Sessions & Co. Ltd. arranging a visit to investigate an issue with jacks. | 19th Feb 1932 | Box 26 \ 3 Scan134 | |
| Letter from Donald Sessions & Company Ltd. concerning the performance and modification of four-wheel jacks. | 26th Feb 1932 | Box 26 \ 3 Scan135 | |
| Continuation letter from Donald Sessions & Company Ltd. regarding the modification of Jacks. | 26th Feb 1932 | Box 26 \ 3 Scan136 | |
| Letter from Donald Sessions & Co Ltd about modifications to jacks for a Phantom II car. | 30th Mar 1932 | Box 26 \ 3 Scan137 | |
| Letter to Donald Sessions & Company Ltd. regarding the successful jacking of a Phantom II model car from a 19' rim. | 31th Mar 1932 | Box 26 \ 3 Scan138 | |
| Requesting the transfer of rear jack brackets from car 22-EX to 19-EX for the fitting of D.W.S. four-wheel jacks. | 31th Mar 1932 | Box 26 \ 3 Scan139 | |
| Letter from Donald Sessions & Co. Ltd. concerning the modification and refitting of D.W.S. Permanent Jacks to a Phantom II. | 11th Apr 1932 | Box 26 \ 3 Scan140 | |
| Letter from Donald Sessions & Co Ltd regarding replacement heat-treated nickel steel bolts for D.W.S. Jacks on a Phantom II chassis. | 22th Apr 1932 | Box 26 \ 3 Scan141 | |
| Letter to Donald Sessions & Co Ltd regarding the late arrival of nickel steel bolts for a car undergoing Continental Tests. | 25th Apr 1932 | Box 26 \ 3 Scan142 | |
| Letter to Donald Sessions & Company Ltd. regarding D.W.S. Jacks fitted to a Phantom II car after its Continental Tests. | 9th Aug 1932 | Box 26 \ 3 Scan143 | |
| Letter from Donald Sessions & Company Ltd. confirming an arrangement for a meeting at the works. | 10th Aug 1932 | Box 26 \ 3 Scan144 | |
| Letter from Donald Sessions & Company Ltd. concerning the testing of D.W.S. Jacks and the supply of a new pattern. | 12th Aug 1932 | Box 26 \ 3 Scan145 | |
| The performance and required modifications for D.W.S. permanent jacks tested on car 19-EX. | 5th Sep 1932 | Box 26 \ 3 Scan146 | |
| Test results on a jack's effect on steering for the 19-EX model and policy on jack fitment. | 5th Sep 1932 | Box 26 \ 3 Scan147 | |
| Specifications for a new jack suitable for the Peregrine model. | 9th Sep 1932 | Box 26 \ 3 Scan148 | |
| The standardization and cost of D.W.S. located jacks for the 40/50 HP Phantom Chassis. | 4th Oct 1932 | Box 26 \ 3 Scan149 | |
| Letter to Donald Sessions & Co. Ltd. regarding the modification and standardisation of D.W.S. jacks. | 1st Oct 1932 | Box 26 \ 3 Scan150 | |
| The approval and pricing for D.W.S. permanent jacks for Phantom II cars. | 4th Oct 1932 | Box 26 \ 3 Scan151 | |
| Letter from Donald Sessions & Co. Ltd. regarding the fitting of modified permanent jacks to a car. | 3rd Oct 1932 | Box 26 \ 3 Scan152 | |
| Standardising D.W.S. jacks on the 40/50 HP chassis, requesting cost and delivery information. | 5th Oct 1932 | Box 26 \ 3 Scan153 | |
| Letter from Donald Sessions & Company Ltd. regarding a delay in delivering a modified D.W.S. jack. | 6th Oct 1932 | Box 26 \ 3 Scan154 | |
| Requesting notification upon approval of a new D.W.S. Jack for introduction into production. | 11th Oct 1932 | Box 26 \ 3 Scan155 | |
| Delay in approving modified D.W.S. Permanent Jacks from the makers due to the Motor Show. | 12th Oct 1932 | Box 26 \ 3 Scan156 | |
| Requisition for D.W.S. Jacks for chassis 156-MS and the status of an improved sample. | 21th Oct 1932 | Box 26 \ 3 Scan157 | |
| Letter received from Cantilever Constructions and asking for direction on how to proceed. | 25th Oct 1932 | Box 26 \ 3 Scan158 | |
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