| Description | Date | Identifier | |
| Letter from The Rover Company regarding the cost of Chromic Acid for Chromium Plating. | 22th Jun 1936 | Box 127 \ 3 scan0103 | |
| Letter to Rover Motor Co. Ltd. discussing chromium plating and potential causes of piston seizure. | 1st Jul 1936 | Box 127 \ 3 scan0104 | |
| The inconsistent results of chromium plating tests on aero engine cylinder bores. | 2nd Jul 1936 | Box 127 \ 3 scan0105 | |
| Letter from The Rover Company Ltd. regarding their testing and results with Chromium Plating. | 2nd Jul 1936 | Box 127 \ 3 scan0106 | |
| Letter to Capt. Wilks of The Rover Motor Co. Ltd. confirming a lunch meeting and discussing a new full-size frame from America. | 20th Aug 1936 | Box 127 \ 3 scan0107 | |
| Letter to M. Wilks of The Rover Motor Co. Ltd. discussing bearing designs for big ends. | 26th Aug 1936 | Box 127 \ 3 scan0108 | |
| Technical drawing detailing a modification to a connecting rod. | 25th Aug 1936 | Box 127 \ 3 scan0109 | |
| Blueprint for a split connecting rod bearing. | 25th Aug 1936 | Box 127 \ 3 scan0110 | |
| Drawing showing the suggested location for a connecting rod bearing bush. | 25th Aug 1936 | Box 127 \ 3 scan0111 | |
| Letter from The Rover Company discussing connecting rod bearings and steering arrangements. | 27th Aug 1936 | Box 127 \ 3 scan0112 | |
| Letter to Rover discussing potential collaboration, a 20HP car, chromium plating tests, and valve springs. | 19th Oct 1936 | Box 127 \ 3 scan0113 | |
| The disadvantages of using internally chromium plated cylinder liners. | 5th Oct 1936 | Box 127 \ 3 scan0114 | |
| Test report on an internally chromium-plated cylinder liner, detailing failure analysis, wear, and previous experience. | 8th Oct 1936 | Box 127 \ 3 scan0115 | |
| Conclusion of an investigation into internally chromium plated liners, which were found to be unsatisfactory. | 22th Sep 1936 | Box 127 \ 3 scan0116 | |
| Reference note indicating the document is complete with photos. | 22th Sep 1936 | Box 127 \ 3 scan0117 | |
| Micro-examination report on the wear and pitting of a chromium-plated cylinder liner. | 22th Sep 1936 | Box 127 \ 3 scan0118 | |
| Analysis of wear, cracking, and corrosion on a chromium and nickel-plated liner. | 14th Sep 1936 | Box 127 \ 3 scan0119 | |
| Blueprint of a chromium-plated liner for a universal single-cylinder unit after a 153-hour water-cooled run. | 14th Sep 1936 | Box 127 \ 3 scan0120 | |
| Laboratory photomicrograph showing a fibrous structure at 150 diameters magnification. | 1st Oct 1935 | Box 127 \ 3 scan0121 | |
| Note on a chrome-plated cylinder liner bore from a universal single-cylinder unit after a 153-hour run. | 1st Oct 1935 | Box 127 \ 3 scan0122 | |
| Laboratory photomicrograph showing a cracked material surface at 150 diameters magnification. | 1st Oct 1935 | Box 127 \ 3 scan0123 | |
| Rubbing or impression of a partly worn area. | 1st Oct 1935 | Box 127 \ 3 scan0124 | |
| Laboratory photomicrograph showing a material surface at 150 diameters magnification. | 1st Oct 1935 | Box 127 \ 3 scan0125 | |
| Describing a slightly worn area, with associated reference numbers. | 1st Oct 1935 | Box 127 \ 3 scan0126 | |
| Laboratory photomicrograph showing a material cross-section at 150x magnification. | 1st Oct 1935 | Box 127 \ 3 scan0127 | |
| Describing a cross-section through a scored mark. | 1st Oct 1935 | Box 127 \ 3 scan0128 | |
| Laboratory photomicrograph showing material microstructure at 60 diameters magnification. | 1st Oct 1935 | Box 127 \ 3 scan0129 | |
| The base of a flange where the nickel-plate is cut away. | 1st Oct 1935 | Box 127 \ 3 scan0130 | |
| Laboratory photomicrograph of a material surface at 150 diameters magnification. | 1st Oct 1935 | Box 127 \ 3 scan0131 | |
| The commencement of a scored mark. | 20th Oct 1936 | Box 127 \ 3 scan0132 | |
| Letter from The Rover Company Ltd. acknowledging a previous letter from W.A. Robotham. | 20th Oct 1936 | Box 127 \ 3 scan0133 | |
| Letter from The Rover Company to W.A. Robotham discussing a visit, chromium bores, valve springs, and chromium plated liners. | 23th Oct 1936 | Box 127 \ 3 scan0134 | |
| Letter to Capt. S.B. Wilks of The Rover Company arranging a meeting and asking about valve springs, petrol pumps, and timing chains. | 28th Oct 1936 | Box 127 \ 3 scan0135 | |
| Internal service memo discussing failures of A.C. fuel pumps, valve springs, and timing chains. | 29th Oct 1936 | Box 127 \ 3 scan0136 | |
| Inter-office memo regarding the effect of a broken spring on car performance. | 29th Oct 1936 | Box 127 \ 3 scan0137 | |
| List comparing the quantity of various parts used over two consecutive yearly periods from August 1934 to 1936. | 30th Oct 1936 | Box 127 \ 3 scan0138 | |
| Letter from The Rover Company Ltd. to W.A. Robotham regarding a gearbox fault investigation. | 30th Oct 1936 | Box 127 \ 3 scan0139 | |
| Letter to The Rover Company suggesting alternative suppliers for valve springs to address 'mysterious knocks'. | 2nd Nov 1936 | Box 127 \ 3 scan0140 | |
| Letter from The Rover Company Ltd. concerning a misunderstanding about a gearbox with a broken tooth. | 2nd Nov 1936 | Box 127 \ 3 scan0141 | |
| Letter from The Rover Company Ltd. thanking Mr. Robotham for information on valve spring suppliers. | 3rd Nov 1936 | Box 127 \ 3 scan0142 | |
| Letter to The Rover Co. Ltd. discussing the merits and variations of the Harrison radiator core. | 4th Nov 1936 | Box 127 \ 3 scan0143 | |
| Comparison of Gallay and Marston radiator matrix blocks and test results. | 5th Nov 1936 | Box 127 \ 3 scan0144 | |
| Letter from The Rover Company to Rolls-Royce requesting information on rear axle and spring rubber mountings. | 5th Nov 1936 | Box 127 \ 3 scan0145 | |
| Letter to The Rover Company Ltd. regarding taking back axle torque through rubber. | 6th Nov 1936 | Box 127 \ 3 scan0146 | |
| Letter to The Rover Company regarding dissatisfaction and reliability of Hardy Spicer Propeller Shafts. | 12th Nov 1936 | Box 127 \ 3 scan0147 | |
| Request to the laboratory to compare the material of a Rover valve spring with that used by the Vauxhall Company. | 16th Nov 1936 | Box 127 \ 3 scan0148 | |
| Letter from The Rover Company regarding complaints about Hardy Spicer propeller shafts. | 17th Nov 1936 | Box 127 \ 3 scan0149 | |
| Micro-examination report on a Rover valve spring, noting its partial decarburisation. | 24th Nov 1936 | Box 127 \ 3 scan0150 | |
| Letter to The Rover Company Ltd. regarding the quality of valve springs and die casting of aluminium parts. | 26th Nov 1936 | Box 127 \ 3 scan0151 | |
| Letter from The Rover Company Ltd. regarding a potential apprenticeship placement for the writer's nephew. | 10th Dec 1936 | Box 127 \ 3 scan0152 | |
| Inquiry to The Rover Company about the advertised use of stainless steel in their brake parts. | 12th Dec 1936 | Box 127 \ 3 scan0153 | |
| Advertisement for Rover cars from 'The Autocar' magazine, with handwritten annotations querying the use of stainless steel in brake parts compared to cadmium plating. | 11th Dec 1936 | Box 127 \ 3 scan0154 | |
| Letter from the Experimental Department discussing the factory's unsatisfactory apprenticeship schemes. | 11th Dec 1936 | Box 127 \ 3 scan0155 | |
| Letter from The Rover Company Ltd. regarding an apprenticeship scheme for a nephew. | 14th Dec 1936 | Box 127 \ 3 scan0156 | |
| Letter from The Rover Company to W.A. Robotham regarding the use of stainless steel in brake parts. | 17th Dec 1936 | Box 127 \ 3 scan0157 | |
| Letter to S.B. Wilks of The Rover Company regarding stainless steel brake parts, propeller shafts, and piston knocks. | 18th Dec 1936 | Box 127 \ 3 scan0158 | |
| Letter from The Rover Company Ltd. to W.A. Robotham regarding progress on rubber universal joints. | 21th Dec 1936 | Box 127 \ 3 scan0159 | |
| Letter from The Rover Company Ltd to Rolls-Royce concerning a blueprint for a chassis layout. | 29th Dec 1936 | Box 127 \ 3 scan0160 | |
| Letter to M.C. Wilks of The Rover Company Ltd. thanking him for a chassis layout. | 4th Jan 1937 | Box 127 \ 3 scan0161 | |
| Letter to S.B. Wilks of The Rover Motor Co. arranging a meeting to discuss the 20.HP. car. | 14th Jan 1937 | Box 127 \ 3 scan0162 | |
| Letter from The Rover Company Ltd regarding a meeting and faults on an experimental 20 HP car. | 15th Jan 1937 | Box 127 \ 3 scan0163 | |
| Typed driving directions to a works location near Birmingham. | 15th Jan 1937 | Box 127 \ 3 scan0164 | |
| Letter from The Rover Company regarding improvements to a sample wedge brake set-up. | 18th Jan 1937 | Box 127 \ 3 scan0165 | |
| Letter to M. Wilks of The Rover Company Ltd. regarding a factory visit and engineering queries. | 19th Jan 1937 | Box 127 \ 3 scan0166 | |
| Letter to Maurice Wilks of The Rover Company requesting cost figures for gearbox wheels. | 20th Jan 1937 | Box 127 \ 3 scan0167 | |
| Letter from The Rover Company Ltd regarding cost figures for gear wheels and arranging a factory visit. | 21th Jan 1937 | Box 127 \ 3 scan0168 | |
| Letter to M. Wilks of The Rover Company Ltd. regarding gear wheel costs and vehicle performance. | 22th Jan 1937 | Box 127 \ 3 scan0169 | |
| Letter to The Rover Company providing a reference for a former employee and feedback on the 20 HP Rover model. | 22th Jan 1937 | Box 127 \ 3 scan0170 | |
| Reference request from The Rover Company for a job applicant, with internal notes regarding the search for their employment record. | 20th Jan 1937 | Box 127 \ 3 scan0171 | |
| Letter to The Rover Company Ltd. to arrange a meeting about gear wheel costs. | 23th Jan 1937 | Box 127 \ 3 scan0172 | |
| List of gear parts for cyanide hardening for Phantom III and Bentley models. | 1st Dec 1936 | Box 127 \ 3 scan0173 | |
| Letter from The Rover Company to Rolls-Royce discussing cylinder wear and requesting information on rear axle vents. | 23th Jan 1937 | Box 127 \ 3 scan0174 | |
| Letter to M. Wilks of Rover Company Ltd. regarding the use and design of axle breathers. | 26th Jan 1937 | Box 127 \ 3 scan0175 | |
| Letter from The Rover Company Ltd to arrange a meeting with Mr. Grylls of the Experimental Department. | 26th Jan 1937 | Box 127 \ 3 scan0176 | |
| Letter from The Rover Company Ltd regarding the price and details of a tooth rounding machine. | 29th Jan 1937 | Box 127 \ 3 scan0177 | |
| Visit to the Rover factory to observe a machine for radius-ing crash-gears. | 30th Jan 1937 | Box 127 \ 3 scan0178 | |
| Letter from The Rover Company Ltd regarding the dispatch of two wheels. | 1st Feb 1937 | Box 127 \ 3 scan0179 | |
| Letter to The Rover Company Ltd. regarding the inspection of two gearboxes and requesting assembly time information. | 5th Feb 1937 | Box 127 \ 3 scan0180 | |
| Letter from the Experimental Dept. to Maurice Wilks of The Rover Company regarding gearbox gears. | 5th Feb 1937 | Box 127 \ 3 scan0181 | |
| Letter from The Rover Company Ltd discussing gearbox assembly times and the return of a loaned breather apparatus. | 11th Feb 1937 | Box 127 \ 3 scan0182 | |
| Letter to S.B. Wilkes of The Rover Motor Co. Ltd. regarding a follow-up to a telephone conversation. | 19th Feb 1937 | Box 127 \ 3 scan0183 | |
| Letter from The Rover Company Ltd. regarding a service issue, weight analysis, and sales figures for the 14-HP model. | 8th May 1937 | Box 127 \ 3 scan0184 | |
| Letter discussing a price comparison of stamped parts and crankshafts. | 16th Aug 1937 | Box 127 \ 3 scan0185 | |
| Comparison of material costs for pistons, valves, crankshafts, and crown wheels. | 5th Aug 1937 | Box 127 \ 3 scan0186 | |
| Cost comparison for Crown Wheels, Bevel Pinions, and Chassis Frames. | 5th Aug 1937 | Box 127 \ 3 scan0187 | |
| Cost comparison for parts and clarifying that labour charges for drop-forged items do not include overheads. | 18th Aug 1937 | Box 127 \ 3 scan0188 | |
| Letter to Mr. Bailey regarding a price comparison for stampings and crankshafts. | 16th Aug 1937 | Box 127 \ 3 scan0189 | |
| Comparison of material costs for various engine and chassis components, detailing standard and alternative options. | 5th Aug 1937 | Box 127 \ 3 scan0190 | |
| Cost comparison document for Crown Wheels, Bevel Pinions, and Chassis Frames. | 5th Aug 1937 | Box 127 \ 3 scan0191 | |
| Letter to The Rover Company Ltd. discussing engine valve grinding, decarbonisation, and fuel performance. | 1st Sep 1937 | Box 127 \ 3 scan0192 | |
| Brief resume of impressions from a visit to Rovers regarding coachwork. | 1st Oct 1937 | Box 127 \ 3 scan0193 | |
| Strategy for car body production, including in-house manufacturing versus outsourcing to coachbuilders. | 1st Oct 1937 | Box 127 \ 3 scan0194 | |
| Letter to Capt. S.B. Wilks of The Rover Company Ltd. regarding trimming, painting costs, and the potential purchase of a 20 HP car. | 5th Oct 1937 | Box 127 \ 3 scan0195 | |
| Letter from The Rover Company regarding a drawing of a Rudge hub and its wheel offset. | 6th Oct 1937 | Box 127 \ 3 scan0196 | |
| Ground clearance measurements for a Rover 20 HP car at maximum bump. | 6th Oct 1937 | Box 127 \ 3 scan0197 | |
| Newspaper clipping detailing the financial progress of the Rover Co. from 1931 to 1937. | 6th Oct 1937 | Box 127 \ 3 scan0198 | |
| Extract from 'The Daily Mail' showing Rover Co.'s financial progress from 1931 to 1937. | 1st Oct 1937 | Box 127 \ 3 scan0199 | |
| Letter to Capt. S.B. Wilks of The Rover Company regarding colour selection. | 5th Nov 1937 | Box 127 \ 3 scan0200 | |
| The dimensions of a Rover 14 vehicle for comparison purposes. | 22th Nov 1937 | Box 127 \ 3 scan0201 | |
| List of interior and exterior dimensions for a Rover 14 vehicle. | 23th Nov 1937 | Box 127 \ 3 scan0202 | |
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