| Description | Date | Identifier | |
| The testing and interchange of rear axles between a 7-Goshawk-11 and a London Demonstration Car. | 18th Dec 1922 | Box 53 \ 1 Scan097 | |
| Poor performance of the Salamanca 20 HP trials chassis following comparative tests. | 20th Jan 1923 | Box 53 \ 1 Scan098 | |
| Dynamo rattle, squeaking brakes, and a valve timing boom on a 20 HP Open Demonstration Car. | 2nd Feb 1923 | Box 53 \ 1 Scan099 | |
| Issues with dynamo rattles and squeaking brakes on a 20 HP Demonstration Car. | 3rd Feb 1923 | Box 53 \ 1 Scan100 | |
| 'Engine Boom' or 'Induction roar' issue and potential solutions for the 20 H.P car. | 3rd Feb 1923 | Box 53 \ 1 Scan101 | |
| Test report on a 20 HP open touring trials car detailing various noises, creaks, and a gear lever fault. | 26th Mar 1923 | Box 53 \ 1 Scan102 | |
| Strengthening shock absorbers and testing settings for the 20 HP Trials Cars. | 11th May 1923 | Box 53 \ 1 Scan103 | |
| Carburettor restrictor issues in 20 HP demonstration cars following a visit. | 16th Jul 1923 | Box 53 \ 1 Scan104 | |
| Extract from an Inspection Report detailing owner criticisms of a 20-HP Chassis. | 10th Jan 1924 | Box 53 \ 1 Scan105 | |
| Booming and vibration issues with the 20-HP silencer and modifications for demonstration cars. | 28th Jan 1924 | Box 53 \ 1 Scan106 | |
| Request to arrange for new exhaust pipes and silencer supports to be fitted to 20-HP demonstration cars. | 24th Jan 1924 | Box 53 \ 1 Scan107 | |
| Customer usage and the future loading of a 20 HP chassis, in light of a report on Trials Car GH-39. | 18th Mar 1924 | Box 53 \ 1 Scan108 | |
| Use of 11-tooth versus 12-tooth axles on 20 HP demonstration cars and associated customer complaints. | 11th Jul 1924 | Box 53 \ 1 Scan109 | |
| Steering stiffness and exhaust boom issues during GMK-65 trials. | 22th Sep 1924 | Box 53 \ 1 Scan110 | |
| Letter from Dunlop Rubber Co. regarding issues with security bolts on cord tyres. | 26th Jul 1922 | Box 53 \ 1 Scan111 | |
| Letter from Dunlop Rubber Co. Ltd. recommending against the use of security bolts with cord tyres following a series of tests. | 27th Jul 1922 | Box 53 \ 1 Scan112 | |
| Letter discussing a recommendation from Dunlop to abandon the use of security bolts on tyres. | 27th Jul 1922 | Box 53 \ 1 Scan113 | |
| Recommendation by tyre manufacturers to abandon the use of security bolts, particularly with cord tyres. | 10th Aug 1922 | Box 53 \ 1 Scan114 | |
| The effectiveness of security bolts for tyres, referencing issues and communication with Dunlop. | 24th Jul 1922 | Box 53 \ 1 Scan115 | |
| Instructions and report for a beaded edge tyre deflation test. | 20th Aug 1922 | Box 53 \ 1 Scan116 | |
| The policy change to abandon the use of security bolts with Dunlop or Michelin cord tyres. | 9th Aug 1922 | Box 53 \ 1 Scan117 | |
| Repairs to an Amateur Driven Goshawk vehicle, including a broken oil pipe and a lost tyre locking ring. | 25th Aug 1922 | Box 53 \ 1 Scan118 | |
| Issues with security bolts on cord tyres, referencing trials by the Dunlop Company and customer feedback. | 28th Aug 1922 | Box 53 \ 1 Scan119 | |
| Recommending the deletion of security bolts for all beaded edge tyres based on supplier responsibility and testing. | 28th Aug 1922 | Box 53 \ 1 Scan120 | |
| Cover letter distributing standardisation sheets for the deletion of tyre security bolts, valve guide bushes, and an exhaust heated throttle. | 5th Oct 1922 | Box 53 \ 1 Scan121 | |
| Standardisation document regarding the deletion of security bolts for tyres. | 4th Sep 1922 | Box 53 \ 1 Scan122 | |
| Internal memorandum regarding the standardisation of deleting security bolts for tyres. | 6th Oct 1922 | Box 53 \ 1 Scan123 | |
| Use and safety of security bolts for tires, referencing a customer incident and Dunlop's advice. | 26th Sep 1922 | Box 53 \ 1 Scan124 | |
| Supply of security bolts suitable for Cord tires. | 26th Sep 1922 | Box 53 \ 1 Scan125 | |
| Discontinuation of security bolts for tyres and bolt valves on inner tubes. | 23th Jul 1923 | Box 53 \ 1 Scan126 | |
| Security bolts and bolt valves in relation to tyres coming off rims, and correspondence with Dunlop. | 20th Aug 1923 | Box 53 \ 1 Scan127 | |
| Issues and experiments related to security bolts and bolt valves for tyres. | 21th Aug 1923 | Box 53 \ 1 Scan128 | |
| Use of security bolts and bolt valves to prevent tyres coming off the rims. | 21th Aug 1923 | Box 53 \ 1 Scan129 | |
| Urgent internal memo concerning a tyre failure incident and the need for security bolts on Dunlop Cord Tyres. | 17th Aug 1923 | Box 53 \ 1 Scan130 | |
| Security bolts and bolt valves in response to tires coming off a customer's car. | 30th Aug 1923 | Box 53 \ 1 Scan131 | |
| Letter to a carriage builder concerning a tyre pressure issue, quoting a Dunlop report. | 30th Aug 1923 | Box 53 \ 1 Scan132 | |
| Letter to Messrs. Myers & Burnell regarding tyre pressures for Sir Lycett Green's driver. | 30th Aug 1923 | Box 53 \ 1 Scan133 | |
| Letter from an automobile carriage builder regarding tyre trouble on a customer's car, where the tyres are coming off the rims. | 29th Aug 1923 | Box 53 \ 1 Scan134 | |
| Customer's ongoing tyre issues, comparing beaded edge and straight sided tyres with the Dunlop Company. | 31th Aug 1923 | Box 53 \ 1 Scan135 | |
| Recommendation to discourage clients from using beaded edge cord tyres. | 31th Aug 1923 | Box 53 \ 1 Scan136 | |
| Tyres coming off the wheels of Chassis No. 18-EE, and the subsequent fitting of security bolts. | 5th Sep 1923 | Box 53 \ 1 Scan137 | |
| Letter to Dunlop Rubber Co. Ltd. to arrange a meeting regarding security bolts and bolt valves. | 7th Sep 1923 | Box 53 \ 1 Scan138 | |
| Meeting with the Dunlop Company regarding the causes of tyre failures and leaving the rim. | 14th Sep 1923 | Box 53 \ 1 Scan139 | |
| Report citing three case studies from the Dunlop Company regarding tyre failures and the effectiveness of security bolts. | 14th Sep 1923 | Box 53 \ 1 Scan140 | |
| The effectiveness and dangers of security bolts for tyres, citing arguments from the Dunlop Company. | 14th Sep 1923 | Box 53 \ 1 Scan141 | |
| Technical discussion on Dunlop tyre safety, pressure gauges, and the use of security bolts. | 14th Sep 1923 | Box 53 \ 1 Scan142 | |
| Tyre deflation, the discontinuation of security bolts, and the importance of checking tyre pressure with a reliable gauge. | 14th Sep 1923 | Box 53 \ 1 Scan143 | |
| Extract from a memo concerning a Dunlop tire failure on Chassis 68-LK due to the absence of security bolts. | 12th Oct 1923 | Box 53 \ 1 Scan144 | |
| Fitting of a locking device for straight-sided rims on chassis and cars already in customers' hands. | 17th Mar 1926 | Box 53 \ 1 Scan145 | |
| Enquiry for an electrostatic voltmeter for insulation tests, with a list of five suggested suppliers. | 21th Nov 1922 | Box 53 \ 1 Scan146 | |
| Follow-up enquiry regarding an electrostatic voltmeter for insulation tests. | 6th Dec 1922 | Box 53 \ 1 Scan147 | |
| Postponement of a visit from Cambridge & Paul Instrument Co. regarding an electrostatic voltmeter. | 25th Jan 1923 | Box 53 \ 1 Scan148 | |
| Request for particulars and prices for an Electrostatic Voltmeter from multiple suppliers. | 11th Dec 1922 | Box 53 \ 1 Scan149 | |
| Letter from The Walsall Electrical Co. Ltd. declining to quote for an Electrostatic Voltmeter but offering catalogues for other products. | 13th Dec 1922 | Box 53 \ 1 Scan150 | |
| Letter from Evershed & Vignoles unable to quote for Electrostatic Voltmeters and enclosing their general list. | 13th Dec 1922 | Box 53 \ 1 Scan151 | |
| Letter from Ferranti Limited unable to supply Electrostatic Voltmeters and referring the inquiry to another company. | 13th Dec 1922 | Box 53 \ 1 Scan152 | |
| Letter from Johnson & Phillips Ltd. replying to an enquiry about Electrostatic Volt-meters. | 16th Dec 1922 | Box 53 \ 1 Scan153 | |
| Request for particulars and prices for an Electrostatic Voltmeter reading up to 5000 volts, sent to three different instrument companies. | 20th Dec 1922 | Box 53 \ 1 Scan154 | |
| Quotation from Everett, Edgcumbe & Co. Ltd for an Electrostatic Voltmeter. | 22th Dec 1922 | Box 53 \ 1 Scan155 | |
| Product specification sheet for High Tension Electrostatic Voltmeters. | 1st Feb 1907 | Box 53 \ 1 Scan156 | |
| Specification sheet for various types of electrostatic voltmeters and their accessories. | 19th Jan 1923 | Box 53 \ 1 Scan157 | |
| Letter from The Cambridge and Paul Instrument Company regarding a quotation for an instrument with a special multiplier. | 19th Jan 1923 | Box 53 \ 1 Scan158 | |
| Letter from The Cambridge and Paul Instrument Co. arranging a visit to discuss an enquiry for an Electro Static Voltmeter. | 23th Jan 1928 | Box 53 \ 1 Scan159 | |
| Quotation from The Cambridge and Paul Instrument Company for an electrostatic voltmeter and a shunted condenser. | 19th Jan 1923 | Box 53 \ 1 Scan160 | |
| Updated quotation for a high-voltage electrostatic voltmeter. | 10th May 1923 | Box 53 \ 1 Scan161 | |
| Enquiry sent to Everett, Edgcumbe & Co. about extending the range of an Electrostatic Voltmeter. | 17th May 1923 | Box 53 \ 1 Scan162 | |
| Letter from Everett, Edgcumbe & Co. Ltd. confirming pricing and specifications for electrostatic voltmeters. | 14th May 1923 | Box 53 \ 1 Scan163 | |
| Quotations for an oscillograph, rectifying valve, and electrostatic voltmeter. | 23th May 1923 | Box 53 \ 1 Scan164 | |
| Specifications for an intermediate instrument and seeking confirmation on oscillograph expenditure. | 23th May 1923 | Box 53 \ 1 Scan165 | |
| Pamphlet detailing Lord Kelvin's High Tension Electrostatic Voltmeters from Kelvin Bottomley & Baird Ltd. | 23th May 1923 | Box 53 \ 1 Scan166 | |
| Instruction and specification sheet for Vertical Electrostatic Voltmeters and Portable Volt Balances. | 16th Jun 1924 | Box 53 \ 1 Scan167 | |
| Instruction sheet detailing a quotation from Messrs Everett Edgecumbe & Co Ltd for an Electrostatic High Tension Voltmeter. | 16th Jun 1924 | Box 53 \ 1 Scan168 | |
| Instruction sheet discussing quotes for a condenser and voltmeter from suppliers. | 29th Jun 1920 | Box 53 \ 1 Scan169 | |
| Requesting the purchase of an accelerometer to compare car acceleration, measure gradients, and braking effect. | 15th Nov 1922 | Box 53 \ 1 Scan170 | |
| Letter to Elliott Bros. regarding dissatisfaction with a non-recording accelerometer and a request to trial a recording model. | 15th May 1923 | Box 53 \ 1 Scan171 | |
| Follow-up letter to Messrs. Elliott Bros. regarding a previous communication about a Recording Accelerometer. | 4th Jun 1923 | Box 53 \ 1 Scan172 | |
| Letter from Elliott Brothers (London) Ltd. regarding a missing previous correspondence about a Recording Accelerometer. | 5th Jun 1923 | Box 53 \ 1 Scan173 | |
| Letter to Messrs. Elliott Bros. attaching a copy of a previous, untraced letter. | 6th Jun 1923 | Box 53 \ 1 Scan174 | |
| Letter from Elliott Brothers (London) Ltd. regarding a faulty Indicating Accelerometer. | 8th Jun 1923 | Box 53 \ 1 Scan175 | |
| Letter from Elliott Brothers regarding the examination of a faulty accelerometer and requesting test results for a new one. | 8th Jun 1923 | Box 53 \ 1 Scan176 | |
| Second Accelerometer being sent by Messrs. Elliott Bros for checking purposes. | 2nd Jun 1923 | Box 53 \ 1 Scan177 | |
| Receipt of a new accelerometer from Elliott Bros. in exchange for an older one, and clarifying ownership for accounting. | 19th Jun 1923 | Box 53 \ 1 Scan178 | |
| Letter to Elliott Bros. confirming receipt of a second accelerometer and outlining plans for testing. | 19th Jun 1923 | Box 53 \ 1 Scan179 | |
| Return of accelerometer No.323 to Messrs. Elliott Bros. and the retention of No.358 as an exchange. | 22th Jun 1923 | Box 53 \ 1 Scan180 | |
| Correspondence with Messrs. Elliott Bros. regarding the testing and return of an accelerometer. | 22th Jun 1923 | Box 53 \ 1 Scan181 | |
| Letter from Elliott Brothers Ltd. regarding a quote to adapt an instrument with a special scale. | 6th Jul 1923 | Box 53 \ 1 Scan182 | |
| Page 2 of a letter from Elliott Brothers (London) Limited regarding a recorder on trial and its price. | 6th Jul 1923 | Box 53 \ 1 Scan183 | |
| Diagram of an accelerometer and gradient meter scale. | 21th Apr 1926 | Box 53 \ 1 Scan184 | |
| Methods of measuring car suspension performance using accelerometers and seismographs. | 21th Apr 1926 | Box 53 \ 1 Scan185 | |
| Trial offer from The Cambridge Instrument Company for Recording Accelerometers. | 12th Sep 1928 | Box 53 \ 1 Scan186 | |
| Brochure for Cambridge Recording Accelerometers (Collins' Patent), detailing typical test records and device specifications. | 12th Sep 1932 | Box 53 \ 1 Scan187 | |
| Introduction and technical description of recording accelerometers, including a standard pattern model. | 12th Sep 1932 | Box 53 \ 1 Scan188 | |
| The function and use of various recording accelerometers and associated equipment for data analysis. | 12th Sep 1932 | Box 53 \ 1 Scan189 | |
| Collection of graphical records showing vibration and acceleration measurements from various sources. | 12th Sep 1932 | Box 53 \ 1 Scan190 | |
| Confidential letter discussing left-hand steering and a move in the US to standardize 20-inch wheels and tires. | 7th Nov 1922 | Box 53 \ 2 Scan001 | |
| Letter discussing the testing of 32x6 tires and wheels before implementing 4-wheel brakes. | 21th Nov 1922 | Box 53 \ 2 Scan002 | |
| Letter to Dunlop Rubber Co. Ltd. discussing a new 32 X 6 tyre being standardized in the US market and suggesting testing. | 21th Nov 1922 | Box 53 \ 2 Scan003 | |
| The proposed move to smaller wheels with fatter tyres and lower tyre pressures. | 28th Nov 1922 | Box 53 \ 2 Scan004 | |
| Letter from Dunlop Rubber Co Ltd discussing developments in tyre sizes for 20-inch wheels. | 28th Nov 1922 | Box 53 \ 2 Scan005 | |
| Continuation sheet from The Dunlop Rubber Co. Ltd. discussing tests on low-pressure propositions. | 12th Dec 1922 | Box 53 \ 2 Scan006 | |
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