| Description | Date | Identifier | |
| Letter to The Packless Gland Co. Ltd. regarding the rating and fluid compatibility of bellows for a cooling system. | 14th Apr 1934 | Box 4 \ 1 01-page048 | |
| Schematic for an automatic starting and warming-up control for horizontal carburettors, including a vapour pressure graph. | 17th Jul 1939 | Box 4 \ 1 01-page049 | |
| Letter from The Packless Gland Co. Ltd. acknowledging a letter and advising a full reply will follow shortly. | 17th Apr 1934 | Box 4 \ 1 01-page050 | |
| Letter from The Packless Gland Co. Ltd. correcting previous data regarding their No. 2 bellows. | 24th Apr 1934 | Box 4 \ 1 01-page051 | |
| Letter discussing the physics and design recommendations for using larger diameter bellows, referencing drawing number LEC.3835. | 24th Apr 1934 | Box 4 \ 1 01-page052 | |
| Page 3 of a letter from The Packless Gland Co. Ltd. discussing bellows and mercury-filled devices. | 30th Apr 1934 | Box 4 \ 1 01-page053 | |
| Listing designs sent for the Spectre Chassis. | 30th Apr 1934 | Box 4 \ 1 01-page054 | |
| Letter to The Packless Gland Co. Ltd. enclosing document LEC.3898 showing larger bellows for comment. | 3rd May 1934 | Box 4 \ 1 01-page055 | |
| Listing drawings sent regarding the 'Spectre' project. | 12th Mar 1934 | Box 4 \ 1 01-page056 | |
| Listing drawings for the 'Spectre' project, including steering, dashboard, and bonnet components. | 2nd Jun 1934 | Box 4 \ 1 01-page057 | |
| Required modification to the damper governor casing for the Spectre's speedometer drive. | 2nd Jun 1934 | Box 4 \ 1 01-page058 | |
| Dispatch of a drawing for a stabiliser at the rear of the chassis for the Spectre model. | 4th Jun 1934 | Box 4 \ 1 01-page059 | |
| The design of the Spectre side spare wheel carrier, with suggestions for improvement. | 5th Jun 1934 | Box 4 \ 1 01-page060 | |
| New front engine mounting scheme (LeC.3954) for the Spectre Engine. | 8th Jun 1934 | Box 4 \ 1 01-page061 | |
| Drawing for a diaphragm type petrol tap for the Spectre project. | 13th Jun 1934 | Box 4 \ 1 01-page062 | |
| Omission of the locking method for a bearing retaining nut on the Spectre rear hub. | 16th Jun 1934 | Box 4 \ 1 01-page063 | |
| Drawings for the Spectre project, including details about new standard frame pieces. | 16th Jun 1934 | Box 4 \ 1 01-page064 | |
| Drawings for the 'Spectre' project, detailing modifications to radiator and engine components. | 21th Jun 1934 | Box 4 \ 1 01-page065 | |
| Listing drawings sent regarding the 'Spectre' project, detailing parts for the radiator, starting handle, and throttle. | 26th Jun 1934 | Box 4 \ 1 01-page066 | |
| Modification to the control for the 'Spectre' damper governor, using an Aerons cable. | 27th Jun 1934 | Box 4 \ 1 01-page067 | |
| Use of smaller diameter cables for the Spectre chassis. | 28th Jun 1934 | Box 4 \ 1 01-page068 | |
| The Spectre Design, attaching a list of schemes applicable to the 'Y' section. | 28th Jun 1934 | Box 4 \ 1 01-page069 | |
| List of scheme drawings for the Spectre Design 'F' Section, detailing frames and fittings. | 28th Jun 1934 | Box 4 \ 1 01-page070 | |
| Index page listing scheme drawings and modifications for vehicle components like frames, fittings, and springs. | 28th Jun 1934 | Box 4 \ 1 01-page071 | |
| Index page listing vehicle components, their section numbers, and applicable scheme or drawing numbers. | 28th Jun 1934 | Box 4 \ 1 01-page072 | |
| Index page listing scheme drawings applicable to various vehicle sections. | 28th Jun 1934 | Box 4 \ 1 01-page073 | |
| Index page listing sections and schemes for shock dampers, axle control, horns, tools, and spares. | 29th Jun 1934 | Box 4 \ 1 01-page074 | |
| Spectre Engine, comparing compression ratios with the Cadillac 16 and considering alternative timing proposals. | 29th Jun 1934 | Box 4 \ 1 01-page075 | |
| Spectre engine's compression ratio and valve timing in comparison to a Cadillac engine. | 25th Jun 1934 | Box 4 \ 1 01-page076 | |
| Engine development for the Spectre model, detailing a new camshaft design and comparing piston types. | 25th Jun 1934 | Box 4 \ 1 01-page077 | |
| Material changes for the Spectre Engine, specifically push rods, tappet blocks, and connecting rods. | 27th Jun 1934 | Box 4 \ 1 01-page078 | |
| Cover letter for a list showing completed design work on the 'S' Section of the Spectre engine. | 28th Jun 1934 | Box 4 \ 1 01-page079 | |
| List of Spectre Design 'E' Section components with their section numbers and applicable scheme drawings. | 28th Jun 1934 | Box 4 \ 1 01-page080 | |
| Index of scheme drawings applicable to various engine component sections. | 28th Jun 1934 | Box 4 \ 1 01-page081 | |
| Index page listing scheme drawings for various engine components. | 28th Jun 1934 | Box 4 \ 1 01-page082 | |
| Index page listing technical sections and their corresponding scheme drawing numbers. | 28th Jun 1934 | Box 4 \ 1 01-page083 | |
| Index page listing scheme drawings applicable to various component sections. | 28th Jun 1934 | Box 4 \ 1 01-page084 | |
| List of scheme drawings applicable to various vehicle sections. | 29th Jun 1934 | Box 4 \ 1 01-page085 | |
| Attaching a list of design schemes for the Spectre Design, applicable to 'G' Section. | 29th Jun 1934 | Box 4 \ 1 01-page086 | |
| Index of scheme drawings for the 'Spectre' design 'G' section, covering the flywheel, clutch, and gearbox. | 29th Jun 1934 | Box 4 \ 1 01-page087 | |
| List of vehicle components and their corresponding scheme drawing numbers. | 29th Jun 1934 | Box 4 \ 1 01-page088 | |
| Index of scheme drawings applicable to various vehicle sections such as axles and brakes. | 29th Jun 1934 | Box 4 \ 1 01-page089 | |
| Index of scheme drawings for servo motor and independent front suspension components. | 29th Jun 1934 | Box 4 \ 1 01-page090 | |
| Referencing a scheme drawing for lubricating the steering column, frame and pivots. | 29th Jun 1934 | Box 4 \ 1 01-page091 | |
| Spectre Design, attaching a list of design schemes for the 'U' Section. | 29th Jun 1934 | Box 4 \ 1 01-page092 | |
| List of components and applicable scheme drawings for the Spectre Design 'D' Section. | 29th Jun 1934 | Box 4 \ 1 01-page093 | |
| List of vehicle components with corresponding section numbers and applicable scheme drawings. | 29th Jun 1934 | Box 4 \ 1 01-page094 | |
| Index of scheme drawings for various vehicle electrical components. | 29th Jun 1934 | Box 4 \ 1 01-page095 | |
| Announcing the completion of the 'Spectre' engine and its readiness for a test bed run. | 29th Jun 1934 | Box 4 \ 1 01-page096 | |
| Secret memo from 'Sg' to 'Hs' arranging to view the completed Spectre engine on the test bed in Derby. | 2nd Jul 1934 | Box 4 \ 1 01-page097 | |
| Mock-up of the 'Spectre' model, including the frame, bodywork, and novel independent front suspension. | 2nd Jul 1934 | Box 4 \ 1 01-page098 | |
| Delay in the production of frames for the Spectre Chassis. | 3rd Jul 1934 | Box 4 \ 1 01-page099 | |
| The initial running and endurance test of the Spectre Engine Unit, detailing performance and observed faults. | 12th Jul 1934 | Box 4 \ 1 01-page100 | |
| Performance graph for the Spectre No. 1 unit engine, plotting BHP and MEP against RPM. | 24th Apr 1940 | Box 4 \ 1 01-page101 | |
| Blueprint detailing modifications to the Spectre Piston, showing an additional sawcut and diametrical drop measurements. | 1st Jan 1940 | Box 4 \ 1 01-page102 | |
| List of ground clearance measurements for the 'Spectre' model under full load conditions. | 5th Sep 1934 | Box 4 \ 1 01-page103 | |
| Increasing vehicle ground clearance for the Spectre model. | 13th Sep 1934 | Box 4 \ 1 01-page104 | |
| Comparison table of ground and buffer clearance measurements for Spectre, Essex 6, and Cadillac models. | 12th Sep 1934 | Box 4 \ 1 01-page105 | |
| Requesting the rebuild of the 'Spectre' car with new parts and re-fitting the wings. | 17th Sep 1934 | Box 4 \ 1 01-page106 | |
| Request for modifications to the 'Spectre' suspension links and steering ratio. | 19th Sep 1934 | Box 4 \ 1 01-page107 | |
| Requested modifications for the 'Spectre' car, including clutch, brake, and servo adjustments. | 19th Sep 1934 | Box 4 \ 1 01-page108 | |
| Listing a tabulated order of importance for various parts required for the Spectre project. | 21th Sep 1934 | Box 4 \ 1 01-page109 | |
| List of tests to be carried out on the Spectre engine upon its return to the test bed. | 21th Sep 1934 | Box 4 \ 1 01-page110 | |
| List of notes and issues related to the 'Spectre' engine. | 21th Sep 1934 | Box 4 \ 1 01-page111 | |
| List of modifications for the 'Second Spectre'. | 21th Sep 1934 | Box 4 \ 1 01-page112 | |
| List of modifications and investigations pertaining to a vehicle chassis. | 28th Sep 1934 | Box 4 \ 1 01-page113 | |
| Design alterations for the second 'Spectre' chassis, focusing on the engine unit. | 28th Sep 1934 | Box 4 \ 1 01-page114 | |
| List detailing the design status and modifications for various engine components. | 28th Sep 1934 | Box 4 \ 1 01-page115 | |
| Progress report on design modifications for various engine and chassis components. | 28th Sep 1934 | Box 4 \ 1 01-page116 | |
| Status report on design and development items including clutch, brakes, steering, and ground clearance. | 28th Sep 1934 | Box 4 \ 1 01-page117 | |
| Design alterations for the Spectre 2nd Chassis, focusing on engine unit modifications. | 28th Sep 1934 | Box 4 \ 1 01-page118 | |
| Status report on the design and modification of various engine components. | 28th Sep 1934 | Box 4 \ 1 01-page119 | |
| List of design modifications and updates for engine and chassis components. | 28th Sep 1934 | Box 4 \ 1 01-page120 | |
| Technical progress report on vehicle components including clutch, axle, brakes, steering, and ground clearance. | 28th Sep 1934 | Box 4 \ 1 01-page121 | |
| Five modifications to be carried out on the Spectre while it is in the shop. | 2nd Oct 1934 | Box 4 \ 1 01-page122 | |
| Listing modifications for the Spectre Car after tests on the La Salle steering. | 3rd Oct 1934 | Box 4 \ 1 01-page123 | |
| Recently completed designs for a distribution board and cut-out unit for the Second Spectre Chassis. | 4th Oct 1934 | Box 4 \ 1 01-page124 | |
| Progress report on the Spectre chassis engine unit, detailing tests and modifications to components. | 9th Oct 1934 | Box 4 \ 1 01-page125 | |
| Road test findings for a vehicle's exhaust, ignition, and steering systems. | 9th Oct 1934 | Box 4 \ 1 01-page126 | |
| Development issues and recommendations for steering, engine smoothness, transmission, gearbox, and clutch systems. | 9th Oct 1934 | Box 4 \ 1 01-page127 | |
| The development and testing of vehicle brakes, accessibility, and suspension systems. | 9th Oct 1934 | Box 4 \ 1 01-page128 | |
| Report discussing the radiator grille, ground clearance, and tyre sizes, comparing them to Cadillac and Bentley models. | 9th Oct 1934 | Box 4 \ 1 01-page129 | |
| Induction, exhaust, and fan noise levels, with a comparison to the Phantom model. | 9th Oct 1934 | Box 4 \ 1 01-page130 | |
| Progress report on the 'Spectre' car's road work and steering improvements, with comparisons to Cadillac and Phantom models. | 9th Oct 1934 | Box 4 \ 1 01-page131 | |
| Specification for the build of the second Spectre Car, detailing engine unit components. | 11th Oct 1934 | Box 4 \ 1 01-page132 | |
| List of required modifications and specifications for a vehicle chassis. | 11th Oct 1934 | Box 4 \ 1 01-page133 | |
| Specifications for a fabric coupling, car appearance, and wheels. | 11th Oct 1934 | Box 4 \ 1 01-page134 | |
| Secret memo regarding the 'Spectre' car, discussing the resolution of steering shocks and a future trial. | 12th Oct 1934 | Box 4 \ 1 01-page135 | |
| 10-point programme of work for the Spectre vehicle. | 19th Oct 1934 | Box 4 \ 1 01-page136 | |
| Spectre engine unit detailing a failed big end bearing, piston knocks, tappet clearances and requests for modifications. | 22th Oct 1934 | Box 4 \ 1 01-page137 | |
| Lubrication of 'Spectre' engine big ends following a breakdown on the test bed. | 25th Oct 1934 | Box 4 \ 1 01-page138 | |
| Slow running (idling) issues with the Spectre engine and experiments to resolve them. | 27th Oct 1934 | Box 4 \ 1 01-page139 | |
| Big end trouble with cracked lead bronze bearings during an endurance test. | 27th Oct 1934 | Box 4 \ 1 01-page140 | |
| Comparison table of ground clearance measurements for various car models. | 29th Oct 1934 | Box 4 \ 1 01-page141 | |
| Modifications for the Spectre model to improve ground clearance, referencing drawing LeC.4147. | 30th Oct 1934 | Box 4 \ 1 01-page142 | |
| List of required jobs and investigations for the Spectre model before it goes into the workshop again. | 1st Nov 1934 | Box 4 \ 1 01-page143 | |
| Proposed instrument arrangements for the second Spectre chassis, indicating a preference for scheme B. | 3rd Nov 1934 | Box 4 \ 1 01-page144 | |
| Requesting the measurement of castor angle on a Spectre No. 2 chassis. | 5th Nov 1934 | Box 4 \ 1 01-page145 | |
| Instruction to fit a negative overlap camshaft to Spectre No. 1 Unit during a rebuild. | 6th Nov 1934 | Box 4 \ 1 01-page146 | |
| Ground clearance issues for the Spectre model compared to the Phantom and a Cadillac. | 7th Nov 1934 | Box 4 \ 1 01-page147 | |
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