| Description | Date | Identifier | |
| Suitability of hand-wound versus electrical rotoscopes and the availability of a stroboscope. | 26th May 1938 | Box 138 \ 2 scan0148 | |
| Sales letter from A. J. Ashdown Ltd to Bentley Motors promoting a new Electric Rotoscope. | 26th May 1938 | Box 138 \ 2 scan0149 | |
| Letter to Messrs. A.J. Ashdown Ltd. confirming satisfaction with the present Rotoscope. | 31th May 1938 | Box 138 \ 2 scan0150 | |
| Letter to Joseph Lucas Ltd. confirming a previous quotation for a high tension peak volt meter test set. | 10th Jun 1938 | Box 138 \ 2 scan0151 | |
| Order to be placed with Joseph Lucas Ltd. for a High Tension Peak Volt meter test set. | 14th Jun 1938 | Box 138 \ 2 scan0152 | |
| Returning a loaned Askania vibrograph and planning vibration tests on a Heinkel engine mounting. | 25th Jun 1938 | Box 138 \ 2 scan0153 | |
| Request to order 100 rolls of special registering paper for the Aero Experimental Department's Askania vibration recording instrument. | 5th Jul 1938 | Box 138 \ 2 scan0154 | |
| Progress report on an investigation into cylinder block vibration on 'Vulture' engines, concluding that rearranging the articulated connecting rod system reduces vibration amplitude. | 27th Aug 1938 | Box 138 \ 2 scan0155 | |
| Vibration tests conducted on Vulture and other engines using an Askania vibrograph. | 5th Jul 1938 | Box 138 \ 2 scan0156 | |
| Cylinder vibration characteristics for a Vulture I engine, detailing test positions and results from vibrograph readings. | 11th Jul 1938 | Box 138 \ 2 scan0157 | |
| Vibration analysis report detailing frequency and amplitude measurements on Vulture engine blocks under varying boost pressures. | 11th Jul 1938 | Box 138 \ 2 scan0158 | |
| Vibration analysis report detailing tests on engine banks, component frequencies, and asymmetric forces. | 14th Jul 1938 | Box 138 \ 2 scan0159 | |
| Engine vibration tests, focusing on airscrew shaft frequency and the effects of master rod positioning. | 18th Jul 1938 | Box 138 \ 2 scan0160 | |
| Cylinder vibration characteristics and boost pressure for the Vulture I No.3 engine. | 9th Jul 1938 | Box 138 \ 2 scan0161 | |
| Carburetter vibration and oscillation issues on Vulture, Peregrine, and Kestrel engines. | 10th Jun 1938 | Box 138 \ 2 scan0162 | |
| The demonstration of a Cambridge Portable Vibrograph used to measure transverse vibrations on a 'Wraith' car engine crankcase. | 13th Sep 1938 | Box 138 \ 2 scan0163 | |
| Analysis of crankcase vibration readings and harmonic effects at different engine speeds. | 13th Sep 1938 | Box 138 \ 2 scan0164 | |
| Photograph of a waveform analysis, likely from an oscillograph or similar instrument. | 18th Oct 1938 | Box 138 \ 2 scan0165 | |
| Experimental department report on the demonstration of the Cambridge Portable Vibrograph. | 18th Oct 1938 | Box 138 \ 2 scan0166 | |
| The demonstration of the Cambridge Portable Vibrograph at the works. | 13th Sep 1938 | Box 138 \ 2 scan0167 | |
| Continuation of a review and comparison of the Cambridge vibrograph instrument, covering its construction and use. | 13th Sep 1938 | Box 138 \ 2 scan0168 | |
| Comparative analysis of the Askania and Cambridge instruments for engine vibration investigations. | 13th Sep 1938 | Box 138 \ 2 scan0169 | |
| Analysis of different record types, time marking methods, and equipment construction. | 13th Sep 1938 | Box 138 \ 2 scan0170 | |
| Engine vibration tests using a Cambridge Vibrograph and considerations for its future use and adaptation. | 13th Sep 1938 | Box 138 \ 2 scan0171 | |
| Potential modifications to a measurement instrument, comparing it to the Askania model. | 13th Sep 1938 | Box 138 \ 2 scan0172 | |
| Recommendations on recording systems for vibration measurement in flight and airscrew testing. | 13th Sep 1938 | Box 138 \ 2 scan0173 | |
| Photographs of a Cambridge Portable Vibrograph and an Askania Vibrograph, related to a report on 'Wraith' crankcase vibration. | 13th Sep 1938 | Box 138 \ 2 scan0174 | |
| The De Havilland strain-gauge recording gear, its performance, and programme of work. | 12th Dec 1938 | Box 138 \ 2 scan0175 | |
| Experimental investigations into crankshaft torsional characteristics and airscrew blade stress measurements. | 12th Dec 1938 | Box 138 \ 2 scan0176 | |
| Request concerning the repetition of vibration tests and adaptation of slip-ring gear for De Havilland airscrews. | 12th Jul 1939 | Box 138 \ 2 scan0177 | |
| Letter to The Cambridge Instrument Co. regarding equipment for measuring car acceleration. | 12th Jul 1939 | Box 138 \ 2 scan0178 | |
| Letter from Cambridge Instrument Company regarding the demonstration and sale of Double Accelerometers. | 14th Jul 1939 | Box 138 \ 2 scan0179 | |
| Brochure for Cambridge Recording Accelerometers, showing typical recorded data and product details. | 1st Jun 1926 | Box 138 \ 2 scan0180 | |
| Introduction to the use of a recording accelerometer, with typical records shown. | 1st Jun 1926 | Box 138 \ 2 scan0181 | |
| The operation of a standard pattern recording accelerometer and showing typical records produced by the device. | 1st Jun 1926 | Box 138 \ 2 scan0182 | |
| Technical description of recording accelerometers, their operation, and methods for analyzing the recorded data. | 19th Jul 1939 | Box 138 \ 2 scan0183 | |
| Letter from 'The Autocar' magazine arranging an appointment to discuss an acceleration and deceleration apparatus. | 19th Jul 1939 | Box 138 \ 2 scan0184 | |
| Letter to Cambridge Instrument Co. Ltd. postponing a demonstration of an accelerometer. | 20th Jul 1939 | Box 138 \ 2 scan0185 | |
| Letter from Cambridge Instrument Company regarding the demonstration of an accelerometer. | 24th Jul 1939 | Box 138 \ 2 scan0186 | |
| Letter from Cambridge Instrument Company arranging a demonstration of an accelerometer. | 3rd Aug 1939 | Box 138 \ 2 scan0187 | |
| Letter from the Experimental Department postponing the demonstration of an accelerometer. | 11th Aug 1939 | Box 138 \ 2 scan0188 | |
| Product specification and information sheet for Marconi-Ekco noise meters and accessories. | 1st Dec 1938 | Box 138 \ 2 scan0189 | |
| Noise Meter (type TF500), its design, features, and various accessories for measuring vibration and analyzing waves. | 1st Dec 1938 | Box 138 \ 2 scan0190 | |
| Photograph of an Integrating Accelerometer with its associated components. | 1st Apr 1938 | Box 138 \ 2 scan0191 | |
| Description of the Integrating Accelerometer Type TF. 414 for determining vehicle riding comfort. | 1st Apr 1938 | Box 138 \ 2 scan0192 | |
| The design and features of an Integrating Accelerometer, Type TF.414. | 1st Apr 1938 | Box 138 \ 2 scan0193 | |
| Specification sheet for the Integrating Accelerometer Type TF.414. | 23th Feb 1940 | Box 138 \ 2 scan0194 | |
| Letter regarding the return of an Exhaust Gas Tester for overhaul and reconditioning. | 23th Feb 1940 | Box 138 \ 2 scan0195 | |
| Sales letter from textile machinery agent John T. Murray offering a stroboscopic tachometer. | 24th Jun 1940 | Box 138 \ 2 scan0196 | |
| Advertising brochure for the M.D.D. Stroboscopic Tachometer detailing its industrial applications and operational principles. | 24th Jun 1940 | Box 138 \ 2 scan0197 | |
| Informational sheet detailing the applications of the M.D.D. Stroboscope for fault-finding and speed measurement across various industries. | 28th Jun 1940 | Box 138 \ 2 scan0198 | |
| Letter to Messrs. John T. Murray declining interest in a Stroboscopic Tachometer. | 28th Jun 1940 | Box 138 \ 2 scan0199 | |
| Request to Rotherham & Co., Ltd for three copies of their catalogue of office instruments. | 27th Aug 1940 | Box 138 \ 2 scan0200 | |
| Description of the Standard-Sunbury Engine Indicator and its operating principles, including extracts from 'The Engineer'. | 4th Nov 1940 | Box 138 \ 2 scan0201 | |
| Description of an electrical indicator system with a Cathode Ray Tube for diagram analysis. | 4th Nov 1940 | Box 138 \ 2 scan0202 | |
| List detailing various applications for a pressure measurement unit in engine analysis. | 4th Nov 1940 | Box 138 \ 2 scan0203 | |
| Proposed design for the Bensport Tachometer Drive, including modifications to cable routing and lubrication. | 3rd Oct 1932 | Box 138 \ 2 scan0204 | |
| The instrument and board layout for the B.3 model. | 10th Nov 1932 | Box 138 \ 2 scan0205 | |
| Agreeing on the instrument board scheme, adding hand-controlled shock dampers for the first Bensport vehicle. | 11th Nov 1932 | Box 138 \ 2 scan0206 | |
| Design of the instrument board and controls for a mock-up car. | 14th Nov 1932 | Box 138 \ 2 scan0207 | |
| Appropriate range for a speedometer and tachometer for Bensport Instruments. | 18th Nov 1932 | Box 138 \ 2 scan0208 | |
| Design, layout, and components for the instrument board of the first Bensport car. | 19th Nov 1932 | Box 138 \ 2 scan0209 | |
| Marking of speedometer dials for Bensport Instruments, postponing the decision until a car is available for road testing. | 21th Nov 1932 | Box 138 \ 2 scan0210 | |
| Letter to Jaeger Ltd. confirming the specifications for a set of instruments for the first experimental Bentley chassis. | 24th Nov 1932 | Box 138 \ 2 scan0211 | |
| Letter to coachbuilder Park Ward & Co Ltd. concerning the design and layout of an instrument board. | 24th Nov 1932 | Box 138 \ 2 scan0212 | |
| Letter to Jaeger Ltd. regarding the drive cable lengths for an Experimental Bentley chassis. | 6th Dec 1932 | Box 138 \ 2 scan0213 | |
| Proposed epicyclic design for a Bensport J.1. tachometer drive. | 15th Dec 1932 | Box 138 \ 2 scan0214 | |
| Blueprints for a flexible drive for the speedometer and tachometer on a 'Bensport' instrument board. | 12th Dec 1932 | Box 138 \ 2 scan0215 | |
| Re-design of the tachometer drive for the Bensport model to achieve reverse rotation. | 21th Dec 1932 | Box 138 \ 2 scan0216 | |
| Request for two lamp holders to help with the correct fittings for a Rolls-Bentley instrument panel. | 5th Jan 1933 | Box 138 \ 2 scan0217 | |
| Letter to A.T. Speedometer Co. Ltd. confirming the dispatch of two lamp holders for a Bentley instrument panel. | 11th Jan 1933 | Box 138 \ 2 scan0218 | |
| The despatch of two lamp holders to The A.T. Speedometer Co. Ltd. for fitting into a Bensport instrument panel. | 11th Jan 1933 | Box 138 \ 2 scan0219 | |
| Design suggestions and technical considerations for the instrument board panel for RR & Bentley cars. | 18th Feb 1933 | Box 138 \ 2 scan0220 | |
| Feedback on the design of a switchboard and outer frame, highlighting potential issues with controls, paint wear, and electrical connections. | 18th Feb 1933 | Box 138 \ 2 scan0221 | |
| Request to Smith & Sons for a model of a combined speedometer and tachometer with glass edge illumination. | 21th Feb 1933 | Box 138 \ 2 scan0222 | |
| Revised design for the Bensport Tachometer Drive for the Phantom II machine. | 21th Feb 1933 | Box 138 \ 2 scan0223 | |
| Blueprint and instrument details for the Bensport model. | 10th Mar 1933 | Box 138 \ 2 scan0224 | |
| Modifications to the Bensport speedometer/tachometer instrument patch on a Bentley. | 26th Apr 1933 | Box 138 \ 2 scan0225 | |
| Comparing slot illumination versus glass edge illumination on Bentley instrument boards. | 4th May 1933 | Box 138 \ 2 scan0226 | |
| Instrument dial illumination, bevel angles, and design specifications for Jaeger versus Smith dials. | 4th May 1933 | Box 138 \ 2 scan0227 | |
| Visibility of instruments on a Bentley and suggesting modifications to the scuttle rail. | 29th May 1933 | Box 138 \ 2 scan0228 | |
| The optimal placement of dashboard instruments for the driver's visibility. | 29th May 1933 | Box 138 \ 2 scan0229 | |
| Position of the ignition warning lights on a Bentley. | 16th Jun 1933 | Box 138 \ 2 scan0230 | |
| The obscuring of the speedometer on Bentley instrument boards by the scuttle rail. | 8th Sep 1933 | Box 138 \ 2 scan0231 | |
| Issues with the Bentley Switchbox installation on model 5-B-IV, resulting in a cracked instrument board. | 4th Jan 1935 | Box 138 \ 2 scan0232 | |
| Proposed instrument board layout for the Phantom III and Wraith models. | 17th Dec 1936 | Box 138 \ 2 scan0233 | |
| Proposed changes to the instrument panel layout, switch arrangements, and dial illumination. | 10th Jun 1937 | Box 138 \ 2 scan0234 | |
| Secret memo regarding the development of Bentley instrument lighting, recommending to cease modifications on the 'L' series and focus on the Bentley III. | 10th Jun 1937 | Box 138 \ 2 scan0235 | |
| Fouling issue between the scuttle ventilator lever and interior lights upon fitting a new Bentley instrument board. | 9th Oct 1937 | Box 138 \ 2 scan0236 | |
| Specifications and distribution for a Wraith temporary instrument board. | 12th Jan 1938 | Box 138 \ 2 scan0237 | |
| Deviation from the drawing for the Wraith instrument boards, requiring packing due to incorrect thickness from Park Wards. | 16th Mar 1938 | Box 138 \ 2 scan0238 | |
| Proposing a change to the procurement and fitting of speedometer and revolution counter drives for experimental cars. | 1st May 1939 | Box 138 \ 2 scan0239 | |
| Implementation of a master switch to control current on the instrument board. | 5th May 1939 | Box 138 \ 2 scan0240 | |
| Secret internal memorandum discussing the feasibility of fitting a 'Vee' screen and American instrument board to a Bentley Comet. | 9th May 1940 | Box 138 \ 2 scan0241 | |
| Alternative windscreen and instrument panel designs, considering screen wipers, radio placement, and driver visibility. | 28th Oct 1938 | Box 138 \ 2 scan0242 | |
| Project proposal for fitting a Vee Screen and American Instrument Board to an 8-cylinder Comet Chassis. | 9th May 1940 | Box 138 \ 2 scan0243 | |
| The design and layout of the windscreen, instrument panel, and interior fittings. | 25th Sep 1939 | Box 138 \ 2 scan0244 | |
| Preliminary project proposal for fitting a 'Vee' screen and an American-style instrument board to an 8-cylinder Bentley Comet chassis. | 9th May 1940 | Box 138 \ 2 scan0245 | |
| The design and layout of the instrument panel, screen, and associated controls. | 3rd Sep 1940 | Box 138 \ 2 scan0246 | |
| Design proposals and features for instrument boards for the Senior Range, Bentley, and R.R. models. | 3rd Sep 1940 | Box 138 \ 2 scan0247 | |
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