| Description | Date | Identifier | |
| The testing of a modified, larger self-draining float for the Autovac petrol feed system. | 1st Jul 1930 | Box 56 \ 1 Scan009 | |
| Continuation of a report on an Autovac fuel system, recommending the adoption of a modification. | 4th Jul 1930 | Box 56 \ 1 Scan010 | |
| Following up on a recommendation to adopt the Autovac Company's self-draining float modification. | 28th Jul 1930 | Box 56 \ 1 Scan011 | |
| The standardisation and production of an Autovac self-draining float. | 14th Aug 1930 | Box 56 \ 1 Scan012 | |
| Standardisation of a self-draining autovac float with larger stem and vent holes. | 14th Jul 1930 | Box 56 \ 1 Scan013 | |
| Standardisation of chassis parts concerning the reversion to reserve petrol supply in the main tank. | 21th Jul 1930 | Box 56 \ 1 Scan014 | |
| Standardisation of an Autovac top in aluminium to save cost and weight. | 28th Jun 1930 | Box 56 \ 1 Scan015 | |
| Instruction to replace suction pipe F.57678 with F.58328 on the 20/25 HP chassis due to a part failure. | 22th Oct 1931 | Box 56 \ 1 Scan016 | |
| Flexible petrol pipe connection for the 20/25 model, referencing print Lev.3864. | 29th Mar 1934 | Box 56 \ 1 Scan017 | |
| Twin-cylinder shock absorber produced by the Delco Co. for Cadillac. | 6th Jan 1931 | Box 56 \ 1 Scan018 | |
| Patent situation and design considerations for shock dampers. | 1st Jan 1931 | Box 56 \ 1 Scan019 | |
| Technical memorandum detailing design considerations for piston slack, lubrication, and valve mechanisms, possibly for a damper. | 7th Jan 1931 | Box 56 \ 1 Scan020 | |
| Cure for noisy shock absorber valve springs by bending them. | 7th Jan 1931 | Box 56 \ 1 Scan021 | |
| Modifications to the double piston shock damper, including lever clearance, valve size, and material specifications. | 10th Jan 1931 | Box 56 \ 1 Scan022 | |
| Modification to a hydraulic shock damper design. | 5th Jan 1931 | Box 56 \ 1 Scan023 | |
| Hand-drawn schematic of a mechanical assembly with various design annotations. | 20th Jan 1931 | Box 56 \ 1 Scan024 | |
| Patent situation for shock dampers. | 20th Jan 1931 | Box 56 \ 1 Scan025 | |
| Current position and value of hydraulic shock damper patents. | 20th Jan 1931 | Box 56 \ 1 Scan026 | |
| Expressing doubt about a new single valve hydraulic shock damper and proposing a method for testing. | 22th Jan 1931 | Box 56 \ 1 Scan027 | |
| Requesting a dedicated test rig for intensive endurance testing of hydraulic shock absorbers. | 26th Jan 1931 | Box 56 \ 1 Scan028 | |
| Analysis of the Delco Lovejoy hydraulic damper and comparison to the original Phantom damper. | 30th Jan 1931 | Box 56 \ 1 Scan029 | |
| Technical analysis and critique of a damper's design, focusing on venting, filtering, and valve operation. | 30th Jan 1931 | Box 56 \ 1 Scan030 | |
| Technical analysis of valve and damper performance, focusing on leaks and pressure velocity factors. | 30th Jan 1931 | Box 56 \ 1 Scan031 | |
| Damper design, patent status, and testing, including road tests and a new double piston damper. | 30th Jan 1931 | Box 56 \ 1 Scan032 | |
| Weight comparison table for Lovejoy and 20 HP Rear shock damper components. | 30th Jan 1931 | Box 56 \ 1 Scan033 | |
| Blueprint showing graphs of deflection tests on hydraulic damper levers and arms under load. | 30th Jan 1931 | Box 56 \ 1 Scan034 | |
| Graphs and data tables showing variation in Delco loading with axle velocity for rear axle dampers. | 9th Jan 1931 | Box 56 \ 1 Scan035 | |
| Series of performance diagrams for a Delco damper under various test conditions. | 9th Jan 1931 | Box 56 \ 1 Scan036 | |
| Graph showing the variation in performance with temperature for a Delco Damper. | 9th Jan 1931 | Box 56 \ 1 Scan037 | |
| Performance variation with speed for a Delco damper, shown through graphs and data tables. | 9th Jan 1931 | Box 56 \ 1 Scan038 | |
| Graph plotting the variation of maximum ball pin load against axle velocity for a 7.5 inch lever under various conditions. | 9th Jan 1931 | Box 56 \ 1 Scan039 | |
| Blueprint diagram for a Lovejoy Piston, detailing its components and features. | 20th Jan 1931 | Box 56 \ 1 Scan040 | |
| Chart and diagram detailing 'Delco' lever deflection test results. | 20th Jan 1931 | Box 56 \ 1 Scan041 | |
| Instructions for fitting hydraulic dampers with specified pressure loads and valve drilling. | 4th Feb 1931 | Box 56 \ 1 Scan042 | |
| Dissatisfaction with current shock absorbers, customer complaints, and proposed modifications for improvement. | 6th Feb 1931 | Box 56 \ 1 Scan043 | |
| Issues and proposed modifications for front shock absorbers on the Phantom II model. | 6th Feb 1931 | Box 56 \ 1 Scan044 | |
| Concerns over a new shock absorber design with a dashboard hand control and proposing modifications. | 6th Feb 1931 | Box 56 \ 1 Scan045 | |
| Blueprint of a mechanical component with three views and a list of its features. | 28th Oct 1931 | Box 56 \ 1 Scan046 | |
| Blueprint drawing showing multiple views and a cross-section of a mechanical component, with a handwritten list of its features. | 28th Oct 1931 | Box 56 \ 1 Scan047 | |
| Blueprint for an intermediate lever for use with a Lovejoy type piston in an SS damper. | 5th Feb 1931 | Box 56 \ 1 Scan048 | |
| Drawing of a Love Joy type piston for an SS rear shock damper. | 5th Feb 1931 | Box 56 \ 1 Scan049 | |
| Blueprint for a Lovejoy type piston for an SS rear shock damper. | 5th Feb 1931 | Box 56 \ 1 Scan050 | |
| Blueprint for a lever for a hydraulic shock damper. | 5th Feb 1931 | Box 56 \ 1 Scan051 | |
| Blueprint for a rocking shaft for a hydraulic shock damper. | 5th Feb 1931 | Box 56 \ 1 Scan052 | |
| Blueprint showing multiple views of a piston and connecting rod assembly. | 6th Feb 1931 | Box 56 \ 1 Scan053 | |
| Design proposal for hydraulic dampers and front axle control, including sketches and material suggestions. | 7th Feb 1931 | Box 56 \ 1 Scan054 | |
| The design, placement, and patenting of shock dampers and relief valves. | 10th Feb 1931 | Box 56 \ 1 Scan055 | |
| Design and principles of shock dampers. | 10th Feb 1931 | Box 56 \ 1 Scan056 | |
| Design considerations for valves, shock dampers, and other vehicle components. | 11th Feb 1931 | Box 56 \ 1 Scan057 | |
| Design and development of Delco hydraulic shock absorbers and the challenges involved. | 11th Feb 1931 | Box 56 \ 1 Scan058 | |
| Impending modifications to shock dampers, advising a halt on finishing parts. | 11th Feb 1931 | Box 56 \ 1 Scan059 | |
| Endurance testing and load settings for improved Phantom II shock absorbers. | 11th Feb 1931 | Box 56 \ 1 Scan060 | |
| Programme for modifying hydraulic dampers and front axle control on the Phantom II model. | 12th Feb 1931 | Box 56 \ 1 Scan061 | |
| Torque control, damper design for the 25 HP and Phantom II, and future damper proposals. | 12th Feb 1931 | Box 56 \ 1 Scan062 | |
| New, simpler shock damper design to address noise and ineffectiveness complaints. | 1st Feb 1931 | Box 56 \ 1 Scan063 | |
| Blueprint showing three views and a list of design features for a hydraulic damper component. | 1st Jan 1941 | Box 56 \ 1 Scan064 | |
| Design, cost, and potential improvements for hydraulic dampers. | 20th Feb 1931 | Box 56 \ 1 Scan065 | |
| Technical notes discussing design considerations for hydraulic system components like glands, bearings, shafts, and valves. | 23th Feb 1931 | Box 56 \ 1 Scan066 | |
| Performance of shock dampers, spring deflection, and a comparison with Delco-Lovejoy dampers. | 23th Feb 1931 | Box 56 \ 1 Scan067 | |
| Technical analysis comparing lever and shaft dimensions and a critique of the Delco damper design. | 24th Feb 1931 | Box 56 \ 1 Scan068 | |
| Copy of a telegram regarding an unsatisfactory damper design. | 24th Feb 1931 | Box 56 \ 1 Scan069 | |
| Technical note with diagrams discussing the design of double piston shock dampers. | 24th Feb 1931 | Box 56 \ 1 Scan070 | |
| Design considerations for various mechanical components, including shafts, bearings, lubrication and valves. | 24th Feb 1931 | Box 56 \ 1 Scan071 | |
| Design competition and a concept for a serrated broach tool. | 25th Feb 1931 | Box 56 \ 1 Scan072 | |
| Design considerations for hydraulic dampers. | 25th Feb 1931 | Box 56 \ 1 Scan073 | |
| Design modifications for a damper mechanism, including material choice and spring specifications. | 26th Feb 1931 | Box 56 \ 1 Scan074 | |
| Technical memorandum discussing the design and manufacturing of hydraulic dampers, with diagrams. | 26th Feb 1931 | Box 56 \ 1 Scan075 | |
| Observations on the re-design of horizontal type hydraulic dampers. | 26th Feb 1931 | Box 56 \ 1 Scan076 | |
| High-speed chassis damping, rebound control, and front axle control, including a small diagram. | 29th Oct 1928 | Box 56 \ 1 Scan077 | |
| Blueprint analyzing suspension damper motion, phase relationships, and effectiveness under different conditions. | 25th Feb 1931 | Box 56 \ 1 Scan078 | |
| Design of shock dampers, with a diagram, recommending the use of a 4-stud cover. | 27th Feb 1931 | Box 56 \ 1 Scan079 | |
| Requesting a rough drawing of a suggestion for hydraulic dampers to be submitted for criticism. | 2nd Mar 1931 | Box 56 \ 1 Scan080 | |
| Design policy for shock dampers, considering a revised design versus a completely new one. | 2nd Mar 1931 | Box 56 \ 1 Scan081 | |
| Material choices and hardness for Delco shock absorber pads. | 3rd Mar 1931 | Box 56 \ 1 Scan082 | |
| Development and application of the P.2 split piston shock damper. | 4th Mar 1931 | Box 56 \ 1 Scan083 | |
| Suggestions for immediate production modifications to hydraulic dampers based on service complaints. | 4th Mar 1931 | Box 56 \ 1 Scan084 | |
| Damper complaints and a proposal for a Delco damper with a new piston design. | 4th Mar 1931 | Box 56 \ 1 Scan085 | |
| High-speed braking tests, car sway, and a comparison with adjustable Delco shock absorbers. | 6th Mar 1931 | Box 56 \ 1 Scan086 | |
| Design choices and development strategies for hydraulic dampers. | 6th Mar 1931 | Box 56 \ 1 Scan087 | |
| Front damper and axle control issues, including lever sizes and component scaling for different vehicle weights. | 6th Mar 1931 | Box 56 \ 1 Scan088 | |
| Proposed programme for P.2. shock dampers, including design choices and fitting them to a 25HP car. | 6th Mar 1931 | Box 56 \ 1 Scan089 | |
| Developments and patents related to hydraulic shock dampers for the 18-EX car. | 7th Mar 1931 | Box 56 \ 1 Scan090 | |
| Alternative, lighter method for making a spring-loaded piston for shock dampers. | 3rd Mar 1931 | Box 56 \ 1 Scan091 | |
| Proposal to use cast iron for a piston instead of Phosphor Bronze for reasons of economy. | 9th Mar 1931 | Box 56 \ 1 Scan092 | |
| From Robotham to Day regarding the N. Scheme damper programme and a request for hardened steel inserts. | 9th Mar 1931 | Box 56 \ 1 Scan093 | |
| Use of cast iron for a shock damper piston. | 1st Mar 1931 | Box 56 \ 1 Scan094 | |
| Recommending a halt in the production of hydraulic shock absorbers until improvements are available. | 13th Mar 1931 | Box 56 \ 1 Scan095 | |
| The state of flux in designing hydraulic shock dampers for the 20/25 HP model. | 17th Mar 1931 | Box 56 \ 1 Scan096 | |
| Casting, materials, and design specifications for a new hydraulic shock damper piston. | 17th Mar 1931 | Box 56 \ 1 Scan097 | |
| Technical notes on shock damper design, materials, and associated components. | 21th Mar 1931 | Box 56 \ 1 Scan098 | |
| Secret memo detailing revisions to a shock-damper piston. | 21th Mar 1931 | Box 56 \ 1 Scan099 | |
| Producing improved shock absorbers by reproducing Delco parts for the Phantom II model. | 23th Mar 1931 | Box 56 \ 1 Scan100 | |
| Design modifications for a revised horizontal shock damper. | 24th Mar 1931 | Box 56 \ 1 Scan101 | |
| Fixed leak and a variable form of leak for experimental work. | 24th Mar 1931 | Box 56 \ 1 Scan102 | |
| The incorporation of cast iron ends with knife-edged valve seats into shock absorbers. | 24th Mar 1931 | Box 56 \ 1 Scan103 | |
| Design review memo for hydraulic shock dampers with annotated sketches. | 1st Apr 1931 | Box 56 \ 1 Scan104 | |
| Design improvements for hydraulic shock dampers. | 3rd Apr 1931 | Box 56 \ 1 Scan105 | |
| Proposed new single-valve design for shock dampers. | 9th Apr 1931 | Box 56 \ 1 Scan106 | |
| Design, testing, and production plans for new hydraulic shock absorbers. | 14th Apr 1931 | Box 56 \ 1 Scan107 | |
| With sketches discussing design options for a piston assembly in hydraulic shock dampers. | 4th Apr 1931 | Box 56 \ 1 Scan108 | |
| | | | |
