| Description | Date | Identifier | |
| Letter to Messrs. Elliott Brothers (London) Ltd. requesting a quotation to alter a millivoltmeter. | 2nd Nov 1934 | Box 165 \ 3 img104 | |
| The purchase of an insulation testing voltmeter from Ferranti Ltd. | 14th Nov 1934 | Box 165 \ 3 img105 | |
| Faulty Elliott microampere meter being sent for examination and repair. | 17th Nov 1934 | Box 165 \ 3 img106 | |
| Letter from Weston Electrical Instrument Co. Ltd. regarding the zero adjustment and transit protection of instruments. | 23th Feb 1935 | Box 165 \ 3 img107 | |
| Request to obtain two small magnets from Messrs. Darwins of Sheffield. | 26th Mar 1935 | Box 165 \ 3 img108 | |
| Blueprint for a magnet core with specified dimensions, material, and polarity. | 26th Mar 1935 | Box 165 \ 3 img109 | |
| Blueprint of a component showing dimensions and direction of flux. | 9th Apr 1935 | Box 165 \ 3 img110 | |
| Requesting the repair of a sticking Weston Galvanometer No.9895. | 9th Apr 1935 | Box 165 \ 3 img111 | |
| Letter from S. Smith & Sons regarding a Statoscope sent under packing slip S.110994. | 12th Apr 1935 | Box 165 \ 3 img112 | |
| Standardisation of parts for instruments with concave dials and modified slot illumination to improve lighting. | 1st Mar 1935 | Box 165 \ 3 img113 | |
| Standardisation of instruments with concave dials and modified slot illumination. | 16th Apr 1935 | Box 165 \ 3 img114 | |
| Examination of a 'THIRTILITE' sample, concluding it is unreliable for continuous running and suggesting a more robust design. | 23th May 1935 | Box 165 \ 3 img115 | |
| Letter providing general information on the function and components of an Oil Tester instrument for car types. | 21th Jul 1935 | Box 165 \ 3 img116 | |
| Sales letter from Lite Limited proposing the inclusion of an 'Oil Tester' device as standard equipment on cars. | 21th Jul 1935 | Box 165 \ 3 img117 | |
| Photograph with handwritten annotations detailing an oil tester body mounted on the engine side of a dashboard. | 21th Jul 1935 | Box 165 \ 3 img118 | |
| Promotional leaflet for 'The MAGIC EYE', a device by Imperial Oil Limited to test the quality of car oil. | 14th Sep 1935 | Box 165 \ 3 img119 | |
| Letter from Cambridge Instrument Co. Ltd. arranging a visit from their Resident Engineer. | 14th Sep 1935 | Box 165 \ 3 img120 | |
| Confirmation of a telegram regarding the despatch of two dials to Hobson, Acton. | 11th Nov 1935 | Box 165 \ 3 img121 | |
| Internal request to order two six-point Ignition Test Gaps for the Electrical Experimental Department. | 23th Oct 1934 | Box 165 \ 3 img122 | |
| Letter from Cambridge Instrument Company confirming the dispatch of two dials to Messrs. Hobsons Ltd. | 11th Nov 1935 | Box 165 \ 3 img123 | |
| Letter from the editor of 'The Electrical Engineer' journal seeking feedback and contributions. | 7th Jan 1936 | Box 165 \ 3 img124 | |
| Internal request to order instrument sets for an Experimental Phantom III chassis, less the electric petrol gauges. | 1st Nov 1935 | Box 165 \ 3 img125 | |
| Letter from the Experimental Department requesting catalogues from The General Electric Co. Ltd. | 8th Jan 1936 | Box 165 \ 3 img126 | |
| Letter to Mr. C.W. Nichols of S. Smith & Sons arranging a meeting to discuss instruments for chassis. | 29th Apr 1936 | Box 165 \ 3 img127 | |
| Letter from S. Smith & Sons (Motor Accessories) Ltd confirming an upcoming meeting on May 15th. | 30th Apr 1936 | Box 165 \ 3 img128 | |
| Letter to C.W. Nichols of Messrs. S. Smith & Sons arranging a meeting. | 6th May 1936 | Box 165 \ 3 img129 | |
| Letter from S. Smith & Sons regarding experiments with new carbon graphitic bearings for tank attachments. | 8th May 1936 | Box 165 \ 3 img130 | |
| Letter from the Sales Director's office arranging a meeting with H.E. West. | 8th May 1936 | Box 165 \ 3 img131 | |
| Letter to S. Smith & Sons Ltd concerning testing petrol tank units with modified bearings. | 9th May 1936 | Box 165 \ 3 img132 | |
| Standardisation of parts for adapting the Phantom III instrument panel to the 20/25 HP model. | 3rd Jun 1936 | Box 165 \ 3 img133 | |
| Cost comparison document for an old and a new part related to the 'N' Series Chassis. | 24th Jun 1936 | Box 165 \ 3 img134 | |
| Letter from Magnet House responding to an enquiry about Tachometer Generators. | 21th Aug 1936 | Box 165 \ 3 img135 | |
| Price list and specification for various types of generators and associated instruments. | 21th Aug 1936 | Box 165 \ 3 img136 | |
| Page 2 of a letter from The General Electric Co. Ltd. detailing an offer and payment terms. | 21th Aug 1936 | Box 165 \ 3 img137 | |
| Outline drawing of a tachometer component with a flexible lead. | 2nd Oct 1933 | Box 165 \ 3 img138 | |
| Blueprint of a pulley for an engine generator, showing dimensions and an exploded view. | 2nd Oct 1933 | Box 165 \ 3 img139 | |
| Arrangement drawing for a No. 3 Tachometer. | 8th Feb 1935 | Box 165 \ 3 img140 | |
| Arrangement drawing for a starter generator. | 8th Feb 1935 | Box 165 \ 3 img141 | |
| Arrangement of Tachometer blueprint. | 14th Sep 1934 | Box 165 \ 3 img142 | |
| Arrangement drawing for a power generator. | 24th Apr 1934 | Box 165 \ 3 img143 | |
| Arrangement drawing of a No. 4 Tachometer with dimensions. | 7th Feb 1935 | Box 165 \ 3 img144 | |
| Arrangement drawing for a drip-tight tachometer generator. | 7th Feb 1935 | Box 165 \ 3 img145 | |
| Arrangement drawing for a No. 4 Tachometer and a water-related component. | 25th Aug 1936 | Box 165 \ 3 img146 | |
| Inquiry to the Foster Instrument Co. Ltd. for a 'Resilia' Patent Dial Recorder to measure temperature on aero engines. | 25th Aug 1936 | Box 165 \ 3 img147 | |
| The closing of a letter requesting delivery time and price for an order. | 26th Aug 1936 | Box 165 \ 3 img148 | |
| Letter from Joseph Lucas Ltd. discussing the supply of regulators, new WT.22 horns, and non-tracking bakelite samples. | 26th Aug 1936 | Box 165 \ 3 img149 | |
| Letter from Joseph Lucas Limited advising the return of a Scintilla magneto. | 3rd Sep 1936 | Box 165 \ 3 img150 | |
| Letter from Joseph Lucas Limited regarding an omitted contact breaker cover for a Scintilla magneto. | 8th Sep 1938 | Box 165 \ 3 img151 | |
| Letter from Weston Electrical Instrument Co. Ltd. regarding the receipt and immediate return of 4 shunts. | 16th Sep 1936 | Box 165 \ 3 img152 | |
| Letter to Cambridge Instrument Co. Ltd. regarding the return of an 'Exhaust Gas Tester' for service. | 26th Oct 1936 | Box 165 \ 3 img153 | |
| Despatch of a Cambridge Exhaust Gas Tester for return to the manufacturer. | 26th Oct 1936 | Box 165 \ 3 img154 | |
| Experimental department report on the first model of an instrument board dimmer unit. | 18th Nov 1936 | Box 165 \ 3 img155 | |
| Condensation issues in Bentley instruments and potential solutions, including ventilation holes or alternative varnish. | 5th Jan 1937 | Box 165 \ 3 img156 | |
| Customer feedback on instrument quality and reliability, specifically from Mr. S. Harris. | 15th Feb 1937 | Box 165 \ 3 img157 | |
| Complaint letter to Mr. Cowen regarding the poor quality of instruments on Rolls Royce and Bentley vehicles, specifically the Phantom III. | 8th Feb 1937 | Box 165 \ 3 img158 | |
| Page 2 of a letter from S. Harris critiquing side play slack and requesting older quality instruments. | 1st Feb 1937 | Box 165 \ 3 img159 | |
| Response letter to a customer's criticism regarding the instruments on a Phantom III chassis, particularly the ammeter. | 1st Feb 1937 | Box 165 \ 3 img160 | |
| Letter to S. Harris Esq. discussing instrument dial manufacturing, pricing, and explaining the causes of slack in the controls. | 1st Feb 1937 | Box 165 \ 3 img161 | |
| Letter to S. Harris Esq. discussing the steering column, instrument board and chassis component improvements. | 1st Feb 1937 | Box 165 \ 3 img162 | |
| Responding to criticisms about the change of instrument suppliers for the Phantom III and the quality of the new parts. | 17th Feb 1937 | Box 165 \ 3 img163 | |
| Covering order for units obtained on loan notes that were used for experimental tests. | 12th Nov 1938 | Box 165 \ 3 img164 | |
| The unavailability of specific French-made car de-frosters from a supplier. | 6th Feb 1941 | Box 165 \ 3 img165 | |
| Letter from S. Smith & Sons acknowledging receipt of a telegram postponing Mr. Moss's visit. | 6th Jun 1941 | Box 165 \ 3 img166 | |
| Letter to C.W. Nicholls of S. Smith & Son Ltd. regarding the postponement of Mr. Moss's visit. | 16th Jun 1941 | Box 165 \ 3 img167 | |
| Letter from S. Smith & Sons (M.A) Ltd confirming a visit from Mr. Moss. | 19th Jun 1941 | Box 165 \ 3 img168 | |
| Letter to Mr. Nicholls of S. Smith & Sons Ltd. arranging a meeting time for Mr. Moss in Derby. | 20th Jun 1941 | Box 165 \ 3 img169 | |
| Concerning a delay in obtaining information for bought-out electrical dashboard parts. | 27th Aug 1941 | Box 165 \ 3 img170 | |
| Letter requesting clarification on R.A.E. Report No. E.1701 concerning Condor III engine performance tests. | 21th Jan 1926 | Box 165 \ 4 img001 | |
| Request for black record paper for an R.A.E. Electrical engine Indicator. | 19th Apr 1926 | Box 165 \ 4 img002 | |
| Disposal instructions for an obsolete Jaeger Speedometer No. 123031. | 2nd Jun 1926 | Box 165 \ 4 img003 | |
| Letter to Societe Anonyme Adolphe Saurer regarding the Farnboro' Electric Indicator. | 27th Sep 1926 | Box 165 \ 4 img004 | |
| Suggesting a new method for mounting the revolution indicator drive pinion on a camshaft. | 29th Nov 1926 | Box 165 \ 4 img005 | |
| Request to arrange an official order for a Smith's Dual Drive Revolution Counter. | 29th Mar 1927 | Box 165 \ 4 img006 | |
| Decision to delete Smith's Dual Rev. Counter Gearbox from the Karachi Machine and the process for its return. | 2nd Apr 1927 | Box 165 \ 4 img007 | |
| Return of a loaned Smith's Dual Rev. Counter Gearbox to the Stores. | 4th Apr 1927 | Box 165 \ 4 img008 | |
| Letter to S. Smith & Son regarding the return of a loaned Dual Rev. Counter Gearbox for trial purposes. | 4th Apr 1927 | Box 165 \ 4 img009 | |
| R.P.M. Indicator Catalogue from Jaeger Ltd. | 15th Jul 1927 | Box 165 \ 4 img010 | |
| Potential adoption of Jaeger speedometers, referencing their use by competitors and notable figures. | 26th Jan 1928 | Box 165 \ 4 img011 | |
| Reliability and noise issues of Jaeger speedometers compared to the A.T. speedometer. | 27th Jan 1928 | Box 165 \ 4 img012 | |
| Letter from Jaeger requesting vehicle specifications to supply and test a new speedometer and clock for the Experimental Department. | 9th Mar 1928 | Box 165 \ 4 img013 | |
| Calculating car speeds in MPH for different axle ratios, based on speedometer and road wheel revolutions. | 8th Mar 1928 | Box 165 \ 4 img014 | |
| Testing of a sample pair of Jaeger speedometers as a less expensive alternative. | 8th Mar 1928 | Box 165 \ 4 img015 | |
| Letter to ED. Jaeger (London) Ltd. with specifications for speedometer instruments and flexible drives. | 12th Mar 1928 | Box 165 \ 4 img016 | |
| Short memo regarding Jaeger Speedometers and an attached letter. | 12th Mar 1928 | Box 165 \ 4 img017 | |
| Correspondence with Ed. Jaeger (London) Ltd. clarifying a request for a 'sample pair of instruments' for testing. | 12th Mar 1928 | Box 165 \ 4 img018 | |
| Letter from Jaeger confirming the dispatch of two sample speedometers for testing, clarifying a misunderstanding about the order. | 14th Mar 1928 | Box 165 \ 4 img019 | |
| Arrangement with the Jaeger Company for the purchase and testing of two speedometers. | 15th Mar 1928 | Box 165 \ 4 img020 | |
| Follow-up letter regarding the status of two Jaeger speedometers sent for testing. | 15th Jun 1928 | Box 165 \ 4 img021 | |
| Test report on a Jaeger Speedometer Type 6183, detailing its accuracy at various RPMs. | 12th Jul 1928 | Box 165 \ 4 img022 | |
| The testing and analysis of a Jaeger Speedometer, type 6193. | 24th Jul 1928 | Box 165 \ 4 img023 | |
| Letter to Jaeger Ltd. requesting particulars for a revolution indicator with a specific speed range. | 3rd Oct 1928 | Box 165 \ 4 img024 | |
| Letter from Ed. Jaeger (London) Ltd. in response to an enquiry for a Revolution Indicator for experimental use. | 10th Oct 1928 | Box 165 \ 4 img025 | |
| Letter to Messrs. Jaeger enquiring about the price of a Revolution Counter No. 6553. | 17th Oct 1928 | Box 165 \ 4 img026 | |
| Letter from Ed. Jaeger (London) Ltd. regarding a Revolution Indicator supplied to The Solex Carburetter Co. | 22th Oct 1928 | Box 165 \ 4 img027 | |
| Performance and suitability of Jaeger speedometers versus the existing A.T. instruments. | 23th Oct 1928 | Box 165 \ 4 img028 | |
| Chasing the results of Jaeger Speedometer tests. | 23th Oct 1928 | Box 165 \ 4 img029 | |
| Letter from a speedometer and clock supplier requesting the back axle ratio for chassis 16 E.X. | 2nd Nov 1928 | Box 165 \ 4 img030 | |
| Letter to Messrs. ED. Jaeger Ltd. providing the axle ratio of a car. | 5th Nov 1928 | Box 165 \ 4 img031 | |
| Request for two specific Jaeger r.p.m. indicators for Schneider Cup engine tests. | 28th Nov 1928 | Box 165 \ 4 img032 | |
| Requesting a report on the Jaegar Speedometer before placing new orders. | 1st Jan 1929 | Box 165 \ 4 img033 | |
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