| Description | Date | Identifier | |
| Letter from Carl A. Neracher regarding the application of Chrysler's spool gear type transmission, with Maybach synchronizers, for Rolls Royce cars. | 6th Sep 1930 | Box 137 \ 5 scan0096 | |
| Letter from Carl A. Neracher discussing a quieter, non-ground gear transmission and arranging for a trial unit to be sent. | 6th Sep 1930 | Box 137 \ 5 scan0097 | |
| Letter to Mr. E. W. Hives regarding internal-geared transmissions. | 6th Sep 1930 | Box 137 \ 5 scan0098 | |
| Details on a proposed larger internal gear assembly, selector shift, axle ratios, and torque-equalized brakes. | 6th Sep 1930 | Box 137 \ 5 scan0099 | |
| Letter from Maurice Olley discussing a servo action scheme and the patent implications of using a Maybach Clutch with a Pearson-Neracher box. | 20th Sep 1930 | Box 137 \ 5 scan0100 | |
| Request to inspect a gearbox supplied by Automotive Research Corp. upon its arrival. | 20th Sep 1930 | Box 137 \ 5 scan0101 | |
| From Wor. to Hs. regarding a letter from Oy.. to be investigated in America. | 15th Oct 1930 | Box 137 \ 5 scan0102 | |
| Various gearbox designs and manufacturing considerations. | 3rd Oct 1930 | Box 137 \ 5 scan0103 | |
| Differences in gear design practices and the effects of the pot-lapping process. | 3rd Oct 1930 | Box 137 \ 5 scan0104 | |
| Comparison of different gearbox ratios and notes on gear manufacturing processes. | 25th Oct 1930 | Box 137 \ 5 scan0105 | |
| Letter discussing a sample four-speed transmission with Maybach clutches and instructions on its operation. | 25th Oct 1930 | Box 137 \ 5 scan0106 | |
| Letter detailing the performance of and requesting feedback on a sample Maybach clutch transmission. | 25th Oct 1930 | Box 137 \ 5 scan0107 | |
| Letter discussing transmission noise, internal gearing technology, and patent licensing. | 25th Oct 1930 | Box 137 \ 5 scan0108 | |
| Letter from J.W. Pearson concerning business representation and licensing of patents, specifically mentioning Borg-Warner Corporation. | 19th Mar 1931 | Box 137 \ 5 scan0109 | |
| Results of tests on an American gearbox fitted with a spool gear third speed. | 19th Mar 1931 | Box 137 \ 5 scan0110 | |
| Request to obtain drawings of American gearboxes, specifically from a 16-cylinder Cadillac, for comparison with the Phantom II. | 10th Apr 1934 | Box 137 \ 5 scan0111 | |
| Inquiry to The Michigan Tool Co. about the supply and specifications of cone worm gears for a motor car engine. | 12th Oct 1934 | Box 137 \ 5 scan0112 | |
| The 4-speed synchromesh gearboxes of Alvis, Hillman, and Humber cars at Olympia in 1934. | 23th Oct 1934 | Box 137 \ 5 scan0113 | |
| Gearbox performance and design, noting noise levels and construction features. | 23th Oct 1934 | Box 137 \ 5 scan0114 | |
| Comparative analysis of gearbox design features, including a section on the Hillman-Minx. | 23th Oct 1934 | Box 137 \ 5 scan0115 | |
| List of technical observations and points for consideration regarding a gearbox design, including synchromesh, gears, and shafts. | 23th Oct 1934 | Box 137 \ 5 scan0116 | |
| Various gearbox components and design considerations. | 23th Oct 1934 | Box 137 \ 5 scan0117 | |
| Gearbox cone placement and the pros and cons of synchronising the first speed gear. | 26th May 1938 | Box 137 \ 5 scan0118 | |
| Letter to David Royce regarding a viewing of an American Warner 3 speed cum overdrive gearbox. | 26th May 1938 | Box 137 \ 5 scan0119 | |
| Letter from David Royce regarding Warner Gear Company's overdrive transmissions. | 27th May 1938 | Box 137 \ 5 scan0120 | |
| Request for a covering order for a Warner Gear overdrive unit and a Chrysler gearbox. | 26th Oct 1938 | Box 137 \ 5 scan0121 | |
| Request to the Warner Gear Division for a Chrysler gearbox with right-hand remote control gearshift. | 26th Oct 1938 | Box 137 \ 5 scan0122 | |
| Night Letter Telegram to Warner Gear Division inquiring about the torque capacity of gearbox model AS3-T86A. | 17th Feb 1939 | Box 137 \ 5 scan0123 | |
| Telegram received by telephone specifying the maximum torque capacity for part number AS3-T86A. | 18th Feb 1939 | Box 137 \ 5 scan0124 | |
| Telegram received by telephone detailing the maximum torque capacity of part AS3-T86A. | 18th Feb 1939 | Box 137 \ 5 scan0125 | |
| Cablegram from Warnergear stating the maximum torque capacity for part number AS3-T86A. | 18th Jun 1947 | Box 137 \ 5 scan0126 | |
| Letter to Chrysler Motors requesting a quote for a speedometer drive unit for a Warner gearbox. | 8th Mar 1939 | Box 137 \ 5 scan0127 | |
| Letter from Chrysler Motors regarding a gearbox and speedometer inquiry. | 13th Mar 1939 | Box 137 \ 5 scan0128 | |
| Letter from Cooper-Stewart Engineering regarding a speedometer for a Warner gearbox. | 17th Mar 1939 | Box 137 \ 5 scan0129 | |
| Letter to Cooper-Stewart Engineering Co. Ltd. requesting a speedometer cable and drive unit for a Warner gearbox. | 23th Mar 1939 | Box 137 \ 5 scan0130 | |
| Letter concerning the availability and specifications of a Speedometer pinion for a Warner gearbox. | 28th Mar 1939 | Box 137 \ 5 scan0131 | |
| Letter to Cooper-Stewart Engineering Co. Ltd. describing markings found on a speedometer worm from a Warner gearbox. | 30th Mar 1939 | Box 137 \ 5 scan0132 | |
| Letter from Cooper-Stewart Engineering regarding a speedometer for a Warner gearbox, suggesting a stock pinion. | 11th Apr 1939 | Box 137 \ 5 scan0133 | |
| Internal request to place an order for a speedometer pinion for a Warner gearbox. | 13th Apr 1939 | Box 137 \ 5 scan0134 | |
| Letter to The Cooper-Stewart Engineering Co. Ltd. regarding a trial for a speedometer pinion. | 13th Apr 1939 | Box 137 \ 5 scan0135 | |
| Letter from The Cooper-Stewart Engineering Co. Ltd. following up on an enquiry for a speedometer pinion for a Warner gearbox. | 29th Apr 1939 | Box 137 \ 5 scan0136 | |
| Letter to The Cooper-Stewart Engineering Co. Ltd. requesting a pinion on a 'sale or return' basis. | 2nd May 1939 | Box 137 \ 5 scan0137 | |
| Letter from Cooper-Stewart Engineering regarding sending a Chrysler speedometer driven gear part for a Warner gearbox. | 15th May 1939 | Box 137 \ 5 scan0138 | |
| Letter to The Cooper-Stewart Engineering Co. Ltd. confirming a speedometer driven gear fits and requesting a quote. | 22th May 1939 | Box 137 \ 5 scan0139 | |
| Order for a speedometer and cable from the Cooper-Stewart Engineering Co. | 26th May 1939 | Box 137 \ 5 scan0140 | |
| Confirmation memo requesting the preparation of drawings for fitting a Warner overdrive gearbox to a Rationalised chassis. | 27th May 1939 | Box 137 \ 5 scan0141 | |
| Providing the name and address of the manufacturers for 3-ply plate glass. | 21th Mar 1912 | Box 137 \ 5 scan0142 | |
| Internal instructions regarding parts for an estimate on a 2300 chassis 4-seater open car. | 7th Nov 1912 | Box 137 \ 5 scan0143 | |
| The trial of Triplex Glass in the windscreens of test and experimental cars. | 25th Jul 1913 | Box 137 \ 5 scan0144 | |
| Instruction to test Triplex glass in the windscreens of experimental cars, using already broken screens where possible. | 26th Jul 1913 | Box 137 \ 5 scan0145 | |
| The supply and fitting of Triplex Glass for a customer, Messrs Homes & Co. | 17th Dec 1913 | Box 137 \ 5 scan0146 | |
| Instruction to issue an official order to fit a piece of Triplex glass to the windscreen of car 1926. | 17th Dec 1913 | Box 137 \ 5 scan0147 | |
| Feedback on the windscreen and luggage carrier design for car 2704, with suggested improvements. | 18th Mar 1914 | Box 137 \ 5 scan0148 | |
| On the testing of 'Triplex' celluloid glass, noting its tendency to discolour and lose transparency. | 25th Mar 1914 | Box 137 \ 5 scan0149 | |
| The suitability of Triplex glass for use in windscreens and windows of covered cars. | 1st Jul 1914 | Box 137 \ 5 scan0150 | |
| Internal memorandum discussing the testing and quality issues of Triplex Glass, leading to the cessation of experiments due to the war. | 2nd Jul 1914 | Box 137 \ 5 scan0151 | |
| Brief internal memo regarding the decision to abandon the use of Triplex Glass. | 6th Jul 1914 | Box 137 \ 5 scan0152 | |
| Ordering a halt to experiments on Triplex Glass. | 7th Jul 1914 | Box 137 \ 5 scan0153 | |
| Enquiry into the use of 'Triplex' glass for the No. 6 Goshawk. | 14th Nov 1922 | Box 137 \ 5 scan0154 | |
| Reasons for not using Triplex glass on the front wing screens of 20 HP cars. | 13th Nov 1922 | Box 137 \ 5 scan0155 | |
| Replacement of a defective glass screen for a Sports Phantom. | 23th Jan 1928 | Box 137 \ 5 scan0156 | |
| Query regarding a case of Triplex Glass for chassis 12-EX held at customs in Paris. | 7th May 1928 | Box 137 \ 5 scan0157 | |
| Request to the Paris Depot to return 3 sheets of Triplex glass to Derby for Chassis 12-EX. | 9th May 1928 | Box 137 \ 5 scan0158 | |
| From Paris to Mr G.W. Hancock regarding the return of a case of Triplex glass for Chassis 12-EX. | 16th May 1928 | Box 137 \ 5 scan0159 | |
| Request to send an official order for three sheets of Triplex Patent Safety Glass. | 30th May 1928 | Box 137 \ 5 scan0160 | |
| Letter advising against the use of toughened glass for car screens due to safety concerns following recent experiments. | 18th Jun 1934 | Box 137 \ 5 scan0161 | |
| Suggestion to use the Bentley front hub inner bearing locking plate on the Bentley III to avoid making new parts. | 16th Jan 1937 | Box 137 \ 5 scan0162 | |
| Letter to Alford & Alder requesting an estimate for manufacturing hubs and hub caps for Bentley chassis. | 7th Sep 1937 | Box 137 \ 5 scan0163 | |
| Letter from Alford & Alder (Engineers) Ltd regarding an enquiry for Bentley chassis hubs and hub caps. | 8th Sep 1937 | Box 137 \ 5 scan0164 | |
| Letter from an automobile component manufacturer regarding a quotation for hubs and hub caps. | 17th Sep 1937 | Box 137 \ 5 scan0165 | |
| Continuation sheet of a business letter from Alford & Alder (Engineers) Ltd. | 22th Sep 1937 | Box 137 \ 5 scan0166 | |
| Letter to Alford & Alder Ltd. concerning the manufacture of hubs for a Bentley chassis. | 22th Sep 1937 | Box 137 \ 5 scan0167 | |
| Letter from Alford & Alder (Engineers) Ltd. confirming an appointment for a representative to visit. | 23th Sep 1937 | Box 137 \ 5 scan0168 | |
| Requesting the despatch of a hub cap and laboratory report to Messrs. Alford & Alder Ltd. | 5th Oct 1937 | Box 137 \ 5 scan0169 | |
| Letter to a supplier regarding the poor quality plating on a sample hub cap. | 5th Oct 1937 | Box 137 \ 5 scan0170 | |
| Letter from a supplier discussing the plating quality of a sample hub cap and requesting testing specifications. | 6th Oct 1937 | Box 137 \ 5 scan0171 | |
| Continuation sheet (page 2) of a letter from Alford & Alder (Engineers) Ltd. | 7th Oct 1937 | Box 137 \ 5 scan0172 | |
| Letter to Alford & Alder (Engineers) Ltd. regarding chromium plating and thread specifications. | 7th Oct 1937 | Box 137 \ 5 scan0173 | |
| Alternative supplier, Alford & Alder, for cheaper hubs than Dunlops. | 16th Oct 1937 | Box 137 \ 5 scan0174 | |
| Quotation from Alford & Alder for the supply of wheel hubs for Bentley and Wraith models. | 24th Nov 1937 | Box 137 \ 5 scan0175 | |
| Copy of a quotation from Alford & Alder (Engineers) Ltd. for supplying hubs and hub caps. | 18th Nov 1937 | Box 137 \ 5 scan0176 | |
| Quotation from Alford & Alder for wheel hubs for the Bentley, Wraith, and B.III models. | 24th Nov 1937 | Box 137 \ 5 scan0177 | |
| Copy of a quotation received from Alford & Alder (Engineers) Ltd. for the supply of hubs and hub caps. | 18th Nov 1937 | Box 137 \ 5 scan0178 | |
| The modification of brake drums for Bentley III front hubs. | 27th Nov 1937 | Box 137 \ 5 scan0179 | |
| Supply of hubs for Dunlop wheels, noting a competing offer and the status of dies for 'Wraith' hubs. | 26th Nov 1937 | Box 137 \ 5 scan0180 | |
| Blueprint alteration for Bentley III Front Hub brake drums and a query on scrapping 5 existing sets. | 26th Nov 1937 | Box 137 \ 5 scan0181 | |
| Alteration note for the dimensions of a front brake drum. | 25th Nov 1937 | Box 137 \ 5 scan0182 | |
| Laboratory report on a chromium plating test of a sample hub cap. | 1st Jan 1939 | Box 137 \ 5 scan0183 | |
| Instructions to Alford & Alder for manufacturing wheel hubs for a Bentley chassis. | 1st Dec 1937 | Box 137 \ 5 scan0184 | |
| Potential cost savings on wheel hubs and seeking alternative supplier quotations. | 6th Dec 1937 | Box 137 \ 5 scan0185 | |
| Instruction memo for the replacement of hub parts for a Bentley III chassis, referencing blueprints and new part numbers. | 6th Dec 1937 | Box 137 \ 5 scan0186 | |
| Copy of a letter from Alford & Alder (Engineers) Ltd. concerning a quotation for parts and tooling. | 8th Dec 1937 | Box 137 \ 5 scan0187 | |
| List of gauges and tooling for rear hubs, front hubs, and hub caps. | 8th Dec 1937 | Box 137 \ 5 scan0188 | |
| Quotation from Alford & Alder (Engineers) Ltd. for the supply of hubs and hub caps. | 8th Dec 1937 | Box 137 \ 5 scan0189 | |
| Visit to a potential supplier, Messrs. Alfold and Alder Ltd., for the manufacturing of wheel hubs. | 8th Dec 1937 | Box 137 \ 5 scan0190 | |
| Observations of manufacturing methods, inspection processes, and general plant conditions. | 8th Dec 1937 | Box 137 \ 5 scan0191 | |
| Supplier quotation from Alford's for Bentley III hubs and potential ordering strategies. | 10th Dec 1937 | Box 137 \ 5 scan0192 | |
| Letter to Messrs. Alford & Alder regarding a laboratory report on a chromium-plated hub cap. | 20th Dec 1937 | Box 137 \ 5 scan0193 | |
| Letter from Alford & Alder regarding a laboratory report on a faulty chromium-plated hub cap. | 30th Dec 1937 | Box 137 \ 5 scan0194 | |
| Letter concerning the submission of a sample hub cap for chromium plating laboratory testing. | 28th Jan 1938 | Box 137 \ 5 scan0195 | |
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