| Description | Date | Identifier | |
| Proposal to test a 6/1 compression ratio on the 20 HP engine to compare its specific output with that of the Lorraine. | 31th Mar 1927 | Box 22 \ 4 Scan119 | |
| Performance graph showing the Brake Horse Power and Brake Mean Effective Pressure increase on a 20 HP engine due to fitting larger valves. | 31th Mar 1927 | Box 22 \ 4 Scan120 | |
| Blank page with a date stamp from the Derby office. | 1st Apr 1927 | Box 22 \ 4 Scan121 | |
| Performance graph comparing an engine's BHP and BMEP using standard versus larger valves and different carburettors. | 31th Mar 1927 | Box 22 \ 4 Scan122 | |
| Graph showing a 20HP power increase due to higher compression ratio, larger valves, and lower depression in the induction pipe. | 31th Mar 1927 | Box 22 \ 4 Scan123 | |
| Graph of gas velocity past standard and large valves relative to engine RPM for a 20 HP engine. | 31th Mar 1927 | Box 22 \ 4 Scan124 | |
| Blueprint detailing the arrangement of two Zenith carburetters on the 20HP model. | 1st Apr 1927 | Box 22 \ 4 Scan125 | |
| The reverse of a document or print, marked with a date and location stamp. | 1st Apr 1927 | Box 22 \ 4 Scan126 | |
| Experiments on crankshaft torsional vibrations and vibration dampers for the 20 HP engine. | 22th Apr 1927 | Box 22 \ 4 Scan127 | |
| The application and effectiveness of friction dampers and harmonic balancers on engines. | 22th Apr 1927 | Box 22 \ 4 Scan128 | |
| Technical discussion on crankshaft vibration, dampers, and harmonic periods in relation to a specific engine model, 1-G-1. | 22th Apr 1927 | Box 22 \ 4 Scan129 | |
| Analysis of engine vibration, focusing on the factors of stiffness and inertia within the crankshaft assembly. | 22th Apr 1927 | Box 22 \ 4 Scan130 | |
| Page from an engine dynamics report comparing inertia and stiffness figures for two models, a standard 20 HP and a 1-G-1. | 22th Apr 1927 | Box 22 \ 4 Scan131 | |
| Page discussing crankshaft stiffness, inertia, and the free period of vibration. | 22th Apr 1927 | Box 22 \ 4 Scan132 | |
| Comparison of crankshaft inertia and stiffness between the standard 20 HP engine and the Lorraine Dietrich engine. | 22th Apr 1927 | Box 22 \ 4 Scan133 | |
| Analysis comparing the inertia and stiffness of four-bearing versus seven-bearing crankshafts, with reference to the Lorraine and Phantom engines. | 22th Apr 1927 | Box 22 \ 4 Scan134 | |
| Crankshaft stiffness, inertia, and vibration factors, concluding with a summary of damper types. | 22th Apr 1927 | Box 22 \ 4 Scan135 | |
| Page discussing engine design considerations for dampers, crankshaft stiffness, inertia, and timing gear drive. | 22th Apr 1927 | Box 22 \ 4 Scan136 | |
| Analysis of engine vibrations and dampers for the 20 HP engine, including considerations for increasing the master period. | 22th Apr 1927 | Box 22 \ 4 Scan137 | |
| Analysis of harmonic vibrations and their effect on the crankshaft in a six-cylinder inline engine. | 22th Apr 1927 | Box 22 \ 4 Scan138 | |
| Continuation page of a technical analysis on shaft frequency, harmonic vibrations, and engine speeds. | 22th Apr 1927 | Box 22 \ 4 Scan139 | |
| Calculation sheet for the periodicity and synchronous speed of a Lorraine-Dietrich crankshaft. | 25th Apr 1927 | Box 22 \ 4 Scan140 | |
| Blank document page with a 'Royce, Limited, Print Room, Derby' stamp. | 25th Apr 1927 | Box 22 \ 4 Scan141 | |
| Diagram showing the amplitude of torsional oscillation due to gas pressure harmonics at full throttle for a Standard 20 engine without a damper. | 10th Apr 1927 | Box 22 \ 4 Scan142 | |
| Mostly blank document page with a purple company stamp in the bottom right corner. | 25th Apr 1987 | Box 22 \ 4 Scan143 | |
| Graph plotting power increase and induction pipe depression against engine RPM for a 20HP engine. | 30th Mar 1927 | Box 22 \ 4 Scan144 | |
| The reverse side of a document page with a purple ink stamp in the bottom right corner. | 1st Apr 1927 | Box 22 \ 4 Scan145 | |
| Suggesting a modified valve timing for the Sports Phantom to improve high-speed output. | 23th Apr 1927 | Box 22 \ 4 Scan146 | |
| Request for a 20 HP car for use and reference, preferably a Lorraine model with a crankshaft damper. | 5th Mar 1927 | Box 22 \ 4 Scan147 | |
| The return of a Lorraine Dietrich car to France for sale, due to it having left-hand steering. | 6th May 1927 | Box 22 \ 4 Scan148 | |
| Internal memorandum about returning a left-hand steering Lorraine Dietrich car to Paris for sale, and the status of three other car bodies designated for scrap. | 30th Nov 1927 | Box 22 \ 4 Scan149 | |
| Expressing interest in the 12-cylinder Maybach car and its potential similarities to a proposed aeroplane engine. | 20th Mar 1930 | Box 22 \ 5 Scan001 | |
| Obtaining full particulars for a 12 Cylinder 'Maybach' Car. | 21th Mar 1930 | Box 22 \ 5 Scan002 | |
| Internal memorandum discussing a 12-Cylinder Maybach car, a letter from a representative in Berlin, and the potential purchase of a chassis. | 28th Mar 1930 | Box 22 \ 5 Scan003 | |
| Letter discussing the 12-Cylinder Maybach car, including an engine report. | 26th Mar 1930 | Box 22 \ 5 Scan004 | |
| Copy of a letter from Hans Detlof von Winterfeldt detailing engine design, accessibility, and fuel consumption issues. | 30th Aug 1930 | Box 22 \ 5 Scan005 | |
| Inquiry to Messrs. Barkers & Co. Ltd. about purchasing a Maybach Double Six with an automatic gearbox. | 30th Aug 1930 | Box 22 \ 5 Scan006 | |
| Letter from coachbuilder Barker & Co. regarding an enquiry for a Maybach Double Six car for a client. | 1st Sep 1930 | Box 22 \ 5 Scan007 | |
| Letter from coachbuilders Barker & Co. regarding an enquiry to the Maybach Company and forwarding their catalogue. | 17th Sep 1930 | Box 22 \ 5 Scan008 | |
| Potential purchase of a Maybach 12-cylinder car for analysis of its gearbox. | 10th Oct 1930 | Box 22 \ 5 Scan009 | |
| Potential purchase of a Maybach 12-cylinder car. | 3rd Oct 1930 | Box 22 \ 5 Scan010 | |
| Trial run and potential cost of importing a Maybach car. | 10th Oct 1930 | Box 22 \ 5 Scan011 | |
| From Sg. to Hs. discussing the potential acquisition of a Maybach car before a trip to America. | 17th Oct 1930 | Box 22 \ 5 Scan012 | |
| Letter from coachbuilders Barker & Co. arranging a meeting with Dr. Maybach about a new car. | 1st Nov 1930 | Box 22 \ 5 Scan013 | |
| The proposal to purchase a Maybach car as a sample for a future twelve-cylinder engine project. | 3rd Nov 1930 | Box 22 \ 5 Scan014 | |
| Letter from Barker & Co. to Mr. Rowbotham about a visit from Maybach representatives and Bentley's interest in their gearbox. | 8th Nov 1933 | Box 22 \ 5 Scan015 | |
| From 'R' outlining current engine work priorities, including aero engines, the P.V. engine, and the 25HP, and a decision on the Maybach car. | 10th Nov 1930 | Box 22 \ 5 Scan016 | |
| Cover letter accompanying the latest information on the 'Maybach'. | 13th Nov 1930 | Box 22 \ 5 Scan017 | |
| Letter to Mr. A. Arnold of Messrs. Barker & Co. Ltd regarding an opportunity to try a Maybach. | 13th Nov 1930 | Box 22 \ 5 Scan018 | |
| Inquiry about the progress of experiments with Maybach type clutches in conjunction with a helical 3rd speed. | 14th Nov 1930 | Box 22 \ 5 Scan019 | |
| From 'Sg.' to 'Hs.' regarding a Maybach Cap, enclosing a copy of a letter to Herr von Winterfeldt. | 6th Feb 1931 | Box 22 \ 5 Scan020 | |
| Confidential letter enquiring about the potential purchase of a 12-cylinder Maybach limousine. | 8th Feb 1931 | Box 22 \ 5 Scan021 | |
| Telephone message regarding prices and options for a Maybach car. | 9th Feb 1931 | Box 22 \ 5 Scan022 | |
| From 'Sg.' to 'Hs.' concerning a Maybach Car and a letter sent to Herr von Winterfeldt. | 16th Feb 1931 | Box 22 \ 5 Scan023 | |
| Confidential letter to Herr von Winterfeldt concerning a Maybach car. | 13th Feb 1931 | Box 22 \ 5 Scan024 | |
| Recommending a trip to Berlin to test a Maybach car and discuss clutch and gearbox designs with the Maybach company. | 18th Feb 1931 | Box 22 \ 5 Scan025 | |
| From Sg. to Hs. regarding a Maybach Car, correcting a date and referencing a letter sent to Herr von Winterfeldt. | 19th Feb 1931 | Box 22 \ 5 Scan026 | |
| Confidential letter arranging a visit to Berlin to test Maybach cars. | 19th Feb 1931 | Box 22 \ 5 Scan027 | |
| Technical memorandum discussing the difficulties and remedies for the engagement of Maybach dogs in a transmission system. | 20th Feb 1931 | Box 22 \ 5 Scan028 | |
| Transmission flexibility, clutch engagement, and gear change mechanisms. | 23th Feb 1931 | Box 22 \ 5 Scan029 | |
| Evaluating Maybach cars at the Berlin Motor Show and the problematic testing of Maybach clutches on car 14-EX. | 23th Feb 1931 | Box 22 \ 5 Scan030 | |
| Circulating a telegram suggesting the trial of company bodies on a Maybach chassis. | 28th Feb 1931 | Box 22 \ 5 Scan031 | |
| Discussion with Dr. Maybach regarding the technical specifications and issues of Maybach dog clutches. | 2nd Mar 1931 | Box 22 \ 5 Scan032 | |
| Analysis and description of the Maybach four-speed easy-change gearbox, including operational diagrams. | 2nd Mar 1931 | Box 22 \ 5 Scan033 | |
| Cross-section diagram and gear ratio table for a new Maybach transmission for large vehicles. | 2nd Mar 1931 | Box 22 \ 5 Scan034 | |
| Trial report of two Maybach cars in Berlin, detailing the performance of the 4-speed silent gearbox. | 2nd Mar 1931 | Box 22 \ 5 Scan035 | |
| Vehicle performance review covering the gearbox, engine, steering, and brakes, with comparisons to other vehicles. | 2nd Mar 1931 | Box 22 \ 5 Scan036 | |
| Summary memo discussing the merits and potential purchase of a Maybach gearbox for testing. | 2nd Mar 1931 | Box 22 \ 5 Scan037 | |
| Design of Maybach gearbox dogs, specifically face angles, tooth rounding, and engagement. | 2nd Mar 1931 | Box 22 \ 5 Scan038 | |
| Trial of a Maybach car's gearbox and considerations for developing a similar easy-change, silent gearbox. | 4th Mar 1931 | Box 22 \ 5 Scan039 | |
| Merits of developing a 12-cylinder engine in-house versus purchasing an existing car. | 4th Mar 1931 | Box 22 \ 5 Scan040 | |
| Letter from Maybach's agent arranging a demonstration of the Maybach Gearbox. | 27th Apr 1931 | Box 22 \ 5 Scan041 | |
| Letter to Ernst Schneider apologising for a mislaid letter and arranging a car trial with the chief engineer. | 6th May 1931 | Box 22 \ 5 Scan042 | |
| Arranging a trial for a Maybach car with Mr Ernst Schneider. | 1st Feb 1935 | Box 22 \ 5 Scan043 | |
| Mercedes oiling scheme and a potential patent conflict. | 9th Jun 1910 | Box 22 \ 5 Scan044 | |
| With specifications for a new type of Mercedes. | 15th Oct 1909 | Box 22 \ 5 Scan045 | |
| Letter discussing the potential purchase of a new Mercedes chassis and evaluating different engine designs. | 13th Jun 1910 | Box 22 \ 5 Scan046 | |
| Letter to F.H. Royce discussing the purchase of a Mercedes for a client, detailing two models. | 16th Jun 1910 | Box 22 \ 5 Scan047 | |
| Engine and clutch designs of various Mercedes models. | 22th Jun 1910 | Box 22 \ 5 Scan048 | |
| Technical memo comparing a 35/40 engine's features, including its clutch and ignition system. | 22th Jun 1910 | Box 22 \ 5 Scan049 | |
| Letter discussing the evaluation of competitor cars with a patented double bevel back axle drive. | 22th Jun 1910 | Box 22 \ 5 Scan050 | |
| Brief internal memo from F.H.R. to C.J. expressing skepticism about a business arrangement. | 22th Jun 1910 | Box 22 \ 5 Scan051 | |
| Potential purchase of Mercedes cars for evaluation and considering a Renault in exchange. | 27th Jun 1910 | Box 22 \ 5 Scan052 | |
| The running condition and design flaws of a recently arrived Mercedes car. | 6th Jul 1910 | Box 22 \ 5 Scan053 | |
| Issues with the scuttle dash causing heat and poor steering. | 6th Jul 1910 | Box 22 \ 5 Scan054 | |
| Request for a description of the Mercedes lubrication system. | 6th Oct 1910 | Box 22 \ 5 Scan055 | |
| Dynamometer test report for a Mercédès chassis. | 22th Nov 1911 | Box 22 \ 5 Scan056 | |
| Specification and drawing for a 26-tooth steel crankshaft pinion for a 30 HP Mercedes. | 21th Dec 1910 | Box 22 \ 5 Scan057 | |
| Pencil rubbing of a 'Mercedes small worm wheel'. | 21th Dec 1910 | Box 22 \ 5 Scan058 | |
| And sketch of a Mercedes large crown wheel's teeth. | 21th Aug 1914 | Box 22 \ 5 Scan059 | |
| And a sketch regarding a large power Mercedes component. | 21th Aug 1914 | Box 22 \ 5 Scan060 | |
| Instructions and specifications for a Mercedes Engine. | 29th Nov 1910 | Box 22 \ 5 Scan061 | |
| Instruction sheet with a hand-drawn diagram and specifications for a piston. | 29th Nov 1910 | Box 22 \ 5 Scan062 | |
| Specifications and notes for a Mercedes Engine. | 26th Nov 1910 | Box 22 \ 5 Scan063 | |
| Technical report to the Directors comparing a recently purchased smaller Mercedes vehicle against their own designs and standards. | 1st Dec 1910 | Box 22 \ 5 Scan064 | |
| Report comparing engine components and design philosophies of competitors like Mercedes and Metallurgique. | 1st Dec 1910 | Box 22 \ 5 Scan065 | |
| Dynamometer power test results for a Mercedes engine, including handwritten notes. | 16th Dec 1910 | Box 22 \ 5 Scan066 | |
| Log sheet detailing the transport and storage movements of a Mercedes vehicle. | 25th Mar 1911 | Box 22 \ 5 Scan067 | |
| Enquiring when a Mercedes car, reference X407, will be available for sale. | 2nd Jan 1912 | Box 22 \ 5 Scan068 | |
| Letter from Milnes Daimler Ltd regarding repairs to a Mercedes chassis and a burst wheel cover. | 3rd Jan 1912 | Box 22 \ 5 Scan069 | |
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