| Description | Date | Identifier | |
| Annotated photograph showing the interior of an Essex Terraplane '8' bottom half crankcase. | 27th Oct 1933 | Box 21 \ 6 Scan092 | |
| Labelled photograph of a partially disassembled Essex Terraplane 'V8' engine. | 27th Oct 1933 | Box 21 \ 6 Scan093 | |
| Blueprint of a crankshaft for an Essex Terraplane 2-4-2. | 27th Oct 1933 | Box 21 \ 6 Scan094 | |
| The reverse of a document showing a faint outline from the front and a purple ink stamp. | 27th Oct 1933 | Box 21 \ 6 Scan095 | |
| Blueprint for an Essex Terraplane '8' Inlet Manifold. | 27th Oct 1933 | Box 21 \ 6 Scan096 | |
| Blueprint of the front engine mounting for an Essex Terraplane '8'. | 27th Oct 1933 | Box 21 \ 6 Scan097 | |
| Blueprint for an Essex Terraplane '8' exhaust manifold with dimensions. | 27th Oct 1933 | Box 21 \ 6 Scan098 | |
| Specification sheet for an Essex Radiator, detailing its weight, water capacity, and matrix measurements. | 27th Oct 1933 | Box 21 \ 6 Scan099 | |
| Blueprint drawing for an Essex Terraplane '8'-Slipper Wheel. | 27th Oct 1933 | Box 21 \ 6 Scan100 | |
| Blueprint of an Essex exhaust silencer. | 27th Oct 1933 | Box 21 \ 6 Scan101 | |
| Blueprint of a rear rubber engine mounting with one central block for an Essex Terraplane '8'. | 27th Oct 1933 | Box 21 \ 6 Scan102 | |
| Diagram showing the Essex arrangement of a hot spot with winter and summer positions. | 27th Oct 1933 | Box 21 \ 6 Scan103 | |
| Blueprint of a Monroe Air Cleaner for an Essex Terraplane '8'. | 25th Sep 1933 | Box 21 \ 6 Scan104 | |
| Specifications and performance graph for the Essex Terraplane Eight. | 25th Sep 1933 | Box 21 \ 6 Scan105 | |
| Largely blank page with a Print Room stamp. | 30th Oct 1933 | Box 21 \ 6 Scan106 | |
| Requesting the manufacture of a fan pulley and stronger valve springs for a Terraplane engine experiment. | 31th Oct 1933 | Box 21 \ 6 Scan107 | |
| Blueprint of a fan pulley for a Terraplane. | 31th Oct 1933 | Box 21 \ 6 Scan108 | |
| Requesting the fitting of a fan pulley and stronger valve springs to an Essex Terraplane. | 7th Nov 1933 | Box 21 \ 6 Scan109 | |
| Torsional vibration tests carried out on a Terraplane crankshaft. | 1st Jan 1934 | Box 21 \ 6 Scan110 | |
| Frame distortion test report for an Essex Terraplane. | 1st Jan 1934 | Box 21 \ 6 Scan111 | |
| Repairs needed for an Essex Terraplane Car before testing. | 10th Jan 1934 | Box 21 \ 6 Scan112 | |
| Arrangement to send an Essex Terraplane car to London for Shaw & Kilburn. | 12th Jan 1934 | Box 21 \ 6 Scan113 | |
| Confirming a telephone call to Shaw & Kilburn's Service Station to expedite work on an Essex Terraplane car. | 13th Jan 1934 | Box 21 \ 6 Scan114 | |
| Letter to Messrs. Shaw & Kilburn Ltd. confirming the faults on Major Cox's Essex car for repair. | 13th Jan 1934 | Box 21 \ 6 Scan115 | |
| Repairs and billing for an Essex Terraplane car at the Shaw & Kilburn Service Station. | 18th Jan 1934 | Box 21 \ 6 Scan116 | |
| Sending an Essex Terraplane car for testing, noting its engine's smoothness and a noisy back axle. | 23th Jan 1934 | Box 21 \ 6 Scan117 | |
| Frame distortion tests comparing a Terraplane and an 18-C-IV car. | 25th Jan 1934 | Box 21 \ 6 Scan118 | |
| Graph plotting angular deflection to show frame distortion for a 20/25 car under various applied torques. | 25th Jan 1934 | Box 21 \ 6 Scan119 | |
| Stamped document page with minimal text from the print room. | 25th Jan 1934 | Box 21 \ 6 Scan120 | |
| Blueprint graph showing the frame distortion of an Essex Terraplane under various levels of applied torque. | 25th Jan 1934 | Box 21 \ 6 Scan121 | |
| Blueprint of the frame for an Essex 'Terraplane' 8 vehicle. | 25th Jan 1934 | Box 21 \ 6 Scan122 | |
| Service arrangements for an Essex Terraplane car. | 11th Jan 1934 | Box 21 \ 6 Scan123 | |
| Springs on a Terraplane car and suggesting a competitive analysis of its components. | 30th Jan 1934 | Box 21 \ 6 Scan124 | |
| Comparing the Essex Terraplane with the 20/25 model, and discussing the merits of an 8-cylinder versus a 12-cylinder engine. | 31th Jan 1934 | Box 21 \ 6 Scan125 | |
| Reviewing the performance and features of a Terraplane motorcar, noting its impressive engine and brakes. | 1st Jan 1934 | Box 21 \ 6 Scan126 | |
| Performance of the Essex Terraplane straight 8 engine and comparing it to other engines. | 1st Feb 1934 | Box 21 \ 6 Scan127 | |
| Pros and cons of various engine configurations, including 8-cylinder Vee and 12-cylinder Vee engines. | 1st Feb 1934 | Box 21 \ 6 Scan128 | |
| Future of the Bentley, proposing a straight 8 engine, and addressing issues with Essex brakes. | 1st Feb 1934 | Box 21 \ 6 Scan129 | |
| Return of an Essex Terraplane vehicle. | 1st Feb 1934 | Box 21 \ 6 Scan130 | |
| Reid Railton's opinions on the Terraplane engine and brakes. | 6th Feb 1934 | Box 21 \ 6 Scan131 | |
| Straight-8 engine, comparing bonnet and engine space with an Essex Terraplane, and mentioning independent front suspension. | 6th Feb 1934 | Box 21 \ 6 Scan132 | |
| Experiment to fit a Terraplane engine into a 20/25 car and considerations for future engine designs. | 6th Feb 1934 | Box 21 \ 6 Scan133 | |
| From Sg. to E. discussing engine strategy, including the Bentley 6-cylinder and prioritising a straight-8. | 6th Feb 1934 | Box 21 \ 6 Scan134 | |
| Feasibility and modifications required to fit a Terraplane engine into a 20/25 chassis. | 7th Feb 1934 | Box 21 \ 6 Scan135 | |
| Confirming arrangements to strip down a Terraplane engine for measurement and potential installation into a 20/25 experimental car. | 8th Feb 1934 | Box 21 \ 6 Scan136 | |
| Confirming the design of a small 12-cylinder engine, ensuring it doesn't interfere with the straight 8 project. | 9th Feb 1934 | Box 21 \ 6 Scan137 | |
| Terraplane engine, particularly the induction system and pistons, in comparison to other engine designs. | 12th Feb 1934 | Box 21 \ 6 Scan138 | |
| Proposed experiments for carburation on a Terraplane engine and a thermostatic bypass on a Bentley chassis. | 8th Mar 1934 | Box 21 \ 6 Scan139 | |
| Questioning the different firing order of a new straight 8 engine compared to the Terraplane engine. | 9th Mar 1934 | Box 21 \ 6 Scan140 | |
| Carburetion experiments, comparing single versus dual carburetter setups and engine layouts. | 10th Mar 1934 | Box 21 \ 6 Scan141 | |
| Letter discussing a Terra-plane car, experiences in the Monte Carlo Rally, and a chassis test. | 7th Feb 1934 | Box 21 \ 6 Scan142 | |
| Letter discussing competitor Terraplane's impressive sales in the United States and a future product comparison at Brooklands. | 7th Apr 1934 | Box 21 \ 6 Scan143 | |
| Confirming a telephone conversation about a standard Terraplane vehicle. | 13th Apr 1934 | Box 21 \ 6 Scan144 | |
| Test drive report and comparison of the Essex Terraplane 6. | 16th Apr 1934 | Box 21 \ 6 Scan145 | |
| Engine vibration tests for the 20/25 model and the value of rubber mountings. | 16th Apr 1934 | Box 21 \ 6 Scan146 | |
| Inquiring about the status of an Essex Terraplane Eight-Cylinder engine analysis. | 17th Apr 1934 | Box 21 \ 6 Scan147 | |
| The speedometer accuracy, maximum speed, and engine characteristics of an Essex Terraplane Six following a test at Brooklands. | 17th Apr 1934 | Box 21 \ 6 Scan148 | |
| Engine mounting experiments on the 20/25 and Phantom models, referencing an Essex Terraplane 6. | 18th Apr 1934 | Box 21 \ 6 Scan149 | |
| Testing status of an Essex Terraplane eight-cylinder engine. | 18th Apr 1934 | Box 21 \ 6 Scan150 | |
| Letter to The Hudson-Essex Co. Ltd. requesting two complete sets of piston rings for an eight-in-line Essex engine. | 26th Apr 1934 | Box 21 \ 6 Scan151 | |
| Request to contact Shaw & Kilburns about a spare rod for a Terraplane straight 8 engine. | 16th Apr 1934 | Box 21 \ 6 Scan152 | |
| Road test report on an Essex Terraplane 6, comparing its performance to a 17-G-IV model. | 23th Apr 1934 | Box 21 \ 6 Scan153 | |
| Test of an Essex Terraplane 6 and the importance of adopting flexible engine mounting methods. | 24th Apr 1934 | Box 21 \ 6 Scan154 | |
| Testing and improvements to the GUB-5 and 20/25 cars, particularly a new rubber engine mounting system. | 25th Apr 1934 | Box 21 \ 6 Scan155 | |
| Test drive report providing impressions on a 6 Cylinder Terraplane after a 60-mile run. | 30th Apr 1934 | Box 21 \ 6 Scan156 | |
| Road test report on a 6-Cylinder Terraplane, detailing its performance and handling characteristics. | 2nd May 1934 | Box 21 \ 6 Scan157 | |
| Missing instruction book for an Essex Terraplane and the delivery status of a Graham-Paige car. | 3rd May 1934 | Box 21 \ 6 Scan158 | |
| Inquiring about the status of fitting an Essex Terraplane eight-cylinder engine into a 20/25 chassis. | 7th May 1934 | Box 21 \ 6 Scan159 | |
| Laboratory report detailing the material composition of a Terraplane gearbox's speed driven gear and motion shaft. | 10th May 1934 | Box 21 \ 6 Scan160 | |
| Proposing to rebuild and dispose of a car with an Essex Terraplane Eight Cylinder engine due to its outdated performance. | 10th May 1934 | Box 21 \ 6 Scan161 | |
| Requesting clarification on the operational differences between the Essex Terraplane and a Rolls Royce model regarding clutch and transmission. | 11th May 1934 | Box 21 \ 6 Scan162 | |
| Comparing the smoothness and engine mounting of an Essex 6 Cylinder Terraplane to the 20/25 model. | 11th May 1934 | Box 21 \ 6 Scan163 | |
| Test report on transmission pumping forces and engine mounting for an Essex 6 Cylinder Terraplane. | 12th May 1934 | Box 21 \ 6 Scan164 | |
| Correcting a reference number for a previous memo concerning an Essex 6 Cylinder Terraplane. | 15th May 1934 | Box 21 \ 6 Scan165 | |
| List of weights for various parts of a Straight Eight Terraplane. | 16th May 1934 | Box 21 \ 6 Scan166 | |
| The decision to cease work on an 8-cylinder Essex engine and dispose of it. | 16th May 1934 | Box 21 \ 6 Scan167 | |
| Arrangements for the sale of an 8-cylinder Essex car. | 17th May 1934 | Box 21 \ 6 Scan168 | |
| Requesting the rebuild of an Essex Terraplane car. | 17th May 1934 | Box 21 \ 6 Scan169 | |
| Brief memo inquiring about the expected arrival of an Essex car for sale. | 28th May 1934 | Box 21 \ 6 Scan170 | |
| Note regarding part identification for a Terraplane 8 car, clarifying shaft nomenclature. | 4th Jun 1934 | Box 21 \ 6 Scan171 | |
| The despatch of parts for a Terraplane 8 from Hudson-Essex Motors Ltd. | 5th Jun 1934 | Box 21 \ 6 Scan172 | |
| Replacement clutch parts for a Terraplane 8 with Hudson Essex Motors Ltd. | 6th Jun 1934 | Box 21 \ 6 Scan173 | |
| Letter to Hudson Motor Car Co. inquiring about the clutch design and reliability of their Terraplane model. | 6th Jun 1934 | Box 21 \ 6 Scan174 | |
| Condition report and dispatch note for an Essex '8' Terraplane sent to Lillie Hall for sale. | 15th Jun 1934 | Box 21 \ 6 Scan175 | |
| Essex '8' Terraplane, noting an incomplete tool kit and recommending new corks be fitted before sale. | 19th Jun 1934 | Box 21 \ 6 Scan176 | |
| Invoice from Hudson Essex Motors for parts ordered by telephone. | 20th Jun 1934 | Box 21 \ 6 Scan177 | |
| Confirmation memo stating that the amount of £1. 19. 9d. is correct and should be paid for order number 54315. | 21th Jun 1934 | Box 21 \ 6 Scan178 | |
| The trial and required modifications for fitting a Terraplane clutch into a Bentley B-1 unit. | 2nd Jul 1934 | Box 21 \ 6 Scan179 | |
| Valve lift and velocity diagram for a Terraplane Six engine, detailing inlet and exhaust. | 12th Jul 1934 | Box 21 \ 6 Scan180 | |
| Blank document stamped by the print room. | 12th Jul 1934 | Box 21 \ 6 Scan181 | |
| Valve lift diagrams for Graham-Paige & Terraplane Six engines. | 27th Jul 1934 | Box 21 \ 6 Scan182 | |
| Request to obtain two Essex Terraplane Six rear engine rubbers complete with steel components. | 29th Aug 1934 | Box 21 \ 6 Scan183 | |
| Request for a water pump for an Essex 6. | 11th Sep 1934 | Box 21 \ 6 Scan184 | |
| Increase in ground clearance for the Spectre model for English and Colonial conditions. | 13th Sep 1934 | Box 21 \ 6 Scan185 | |
| Comparative table of ground clearance measurements for Spectre, Essex 6, and Cadillac vehicles. | 12th Sep 1934 | Box 21 \ 6 Scan186 | |
| The despatch of an incorrectly sent 'Essex 6 Part' to Messrs. Shaw & Kilburn. | 13th Sep 1934 | Box 21 \ 6 Scan187 | |
| Urgent request to despatch a water pump assembly for an Essex 6 after a previous replacement failed. | 22th Sep 1934 | Box 21 \ 6 Scan188 | |
| Letter regarding a cracked water pump assembly that is being returned for an urgent replacement. | 22th Sep 1934 | Box 21 \ 6 Scan189 | |
| Comparison table of ground clearances for various vehicle models. | 29th Oct 1934 | Box 21 \ 6 Scan190 | |
| Request for particulars, including component weights and an arrangement drawing, for a Terraplane 6 engine. | 29th Jan 1935 | Box 21 \ 6 Scan191 | |
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