| Description | Date | Identifier | |
| Letter discussing available Chronograph records for braking, steering wobble, and bench testing. | 22th Jul 1926 | Box 138 \ 2 scan0048 | |
| Method for measuring high-speed steering wobbles using a chronograph and electrical contacts. | 22th Jul 1926 | Box 138 \ 2 scan0049 | |
| The adaptation of a 3-pen chronograph for the accurate measurement of braking performance. | 22th Jul 1926 | Box 138 \ 2 scan0050 | |
| Continued page of a report on methods for recording and analyzing vehicle braking and acceleration performance. | 22th Jul 1926 | Box 138 \ 2 scan0051 | |
| Requesting the manufacture of necessary pieces for a chronograph modification. | 5th Jun 1928 | Box 138 \ 2 scan0052 | |
| Urgent request for parts ('bits') to be used in conjunction with a Chronograph for a test. | 25th Jul 1928 | Box 138 \ 2 scan0053 | |
| Requesting an item to be made for a Chronograph to record axle movements on the road. | 9th Sep 1928 | Box 138 \ 2 scan0054 | |
| Internal request to order paper and ink for a 3-pen Chronograph. | 6th Feb 1930 | Box 138 \ 2 scan0055 | |
| Request to order a roll of paper for a Cambridge three-pen Chronograph. | 12th Feb 1930 | Box 138 \ 2 scan0056 | |
| Letter from Cambridge Instrument Company requesting specimen records from their Laboratory Chronograph for marketing purposes. | 6th Jul 1931 | Box 138 \ 2 scan0057 | |
| Letter to the Cambridge Instrument Co. Ltd. concerning the release of experimental Chronograph records. | 16th Jul 1931 | Box 138 \ 2 scan0058 | |
| Internal order request for supplies for a 3 Pen Laboratory Chronograph. | 20th Sep 1934 | Box 138 \ 2 scan0059 | |
| Request to build the necessary parts for a shock damper pressure indicator. | 22th Mar 1935 | Box 138 \ 2 scan0060 | |
| Inquiry to The Cambridge Instrument Co. about modifying a 3 Pen Laboratory Chronograph for wider paper. | 29th Oct 1935 | Box 138 \ 2 scan0061 | |
| Quotation letter from Cambridge Instrument Company for a tenth seconds clock with a contact breaker. | 19th Jan 1937 | Box 138 \ 2 scan0062 | |
| Description of the Cambridge Universal Vibrograph instrument and its various configurations. | 19th Jan 1937 | Box 138 \ 2 scan0063 | |
| Page 2 of a document describing a portable flywheel and recording unit for measuring rotational and vibrational work. | 19th Jan 1937 | Box 138 \ 2 scan0064 | |
| Photograph of a Cambridge Instrument Co. Ltd. recording apparatus with various controls and a measurement scale. | 19th Jan 1937 | Box 138 \ 2 scan0065 | |
| Photograph of a portable recording apparatus with a shoulder strap. | 19th Jan 1937 | Box 138 \ 2 scan0066 | |
| Photograph of a Cambridge Instrument Company recording instrument. | 19th Jan 1937 | Box 138 \ 2 scan0067 | |
| Photograph of a portable recording instrument manufactured by the Cambridge Instrument Co. Ltd. | 19th Jan 1937 | Box 138 \ 2 scan0068 | |
| Photograph of a piece of British Thomson-Houston test equipment, labelled as Figure 3. | 15th Jan 1937 | Box 138 \ 2 scan0069 | |
| Inquiry to The Cambridge Instrument Co. Ltd. regarding the price for a tenth-seconds clock with a contact breaker. | 15th Jan 1937 | Box 138 \ 2 scan0070 | |
| Potential purchase and testing of the Dodd's Indicator for measuring mechanical movements, pressure, and detonation. | 18th Jan 1937 | Box 138 \ 2 scan0071 | |
| The capabilities of Dodd's Indicator following a visit to the Anglo-American Oil Company. | 13th Jan 1937 | Box 138 \ 2 scan0072 | |
| The cost and proposed testing of a detonation indicator and its components. | 19th Jan 1937 | Box 138 \ 2 scan0073 | |
| Letter from the Experimental Department to The Cambridge Scientific Instrument Co. arranging a visit to discuss accelerometers. | 19th Jan 1937 | Box 138 \ 2 scan0074 | |
| Request to purchase a micrometer for measuring parallel round cylinder bores. | 20th Jan 1937 | Box 138 \ 2 scan0075 | |
| Letter from Cambridge Instrument Company arranging a meeting with Mr S. Grylls. | 20th Jan 1937 | Box 138 \ 2 scan0076 | |
| Letter to The Cambridge Instrument Co. Ltd. instructing the purchase of a clock. | 22th Jan 1937 | Box 138 \ 2 scan0077 | |
| Requesting the purchase of a tenth-second clock for an apparatus to determine the minimum stopping distance of a car. | 22th Jan 1937 | Box 138 \ 2 scan0078 | |
| From 'Rm' to 'Hs' requesting to purchase a micrometer for cylinder bore work. | 20th Jan 1937 | Box 138 \ 2 scan0079 | |
| Request to purchase one 'Mercer' Cylinder Micrometer for the Experimental Test Section. | 21th Jan 1937 | Box 138 \ 2 scan0080 | |
| Inquiry to Peter Brotherhood Engineering Works about the suitability of a rotational accelerometer for measuring torsional vibrations. | 29th Jan 1937 | Box 138 \ 2 scan0081 | |
| Request for a Hopkinson oil pressure gauge for engine development in No. 30 Test House. | 1st Feb 1937 | Box 138 \ 2 scan0082 | |
| Inquiry to Messrs. Dobbie McInnes & Clyde Ltd. regarding the manufacture and cost of a Summers torsional vibration indicator. | 4th Feb 1937 | Box 138 \ 2 scan0083 | |
| Letter from Peter Brotherhood Ltd. discussing the suitability of a rotational accelerometer for investigating high-frequency torsional vibrations. | 5th Feb 1937 | Box 138 \ 2 scan0084 | |
| Letter from Dobbie McInnes & Clyde Ltd. regarding their inability to provide information on a Torsional Vibration Indicator. | 5th Feb 1937 | Box 138 \ 2 scan0085 | |
| Letter to the Anglo-Iranian Oil Co. Ltd. inquiring about a Summers Torsional Vibration Indicator. | 12th Feb 1937 | Box 138 \ 2 scan0086 | |
| Testing of a valve regulator indicator and proposed modifications to its reed. | 16th Feb 1937 | Box 138 \ 2 scan0087 | |
| Invoices for Burgess Air Filters supplied via a verbal order from a Mr. Whyman. | 16th Feb 1937 | Box 138 \ 2 scan0088 | |
| Letter to Messrs. Peter Brotherhood Ltd. arranging a visit to observe tests with a Cambridge Instrument. | 18th Feb 1937 | Box 138 \ 2 scan0089 | |
| Letter from the Anglo-Iranian Oil Company discussing a torsiograph and cathode ray indicator for engine testing. | 18th Feb 1937 | Box 138 \ 2 scan0090 | |
| Letter from Peter Brotherhood Ltd. regarding the unavailability of a Cambridge Instrument and postponing a visit. | 22th Feb 1937 | Box 138 \ 2 scan0091 | |
| Letter to Cambridge Instrument Company about the progress of a sideways accelerometer mock-up. | 1st Mar 1937 | Box 138 \ 2 scan0092 | |
| Letter from Cambridge Instrument Company discussing the development of an accelerometer. | 4th Mar 1937 | Box 138 \ 2 scan0093 | |
| Letter to Cambridge Instrument Company, Ltd. regarding the collection of a sideways accelerometer. | 10th Mar 1937 | Box 138 \ 2 scan0094 | |
| Letter from Cambridge Instrument Company arranging the collection of a sideways accelerometer. | 11th Mar 1937 | Box 138 \ 2 scan0095 | |
| From Grylls arranging a visit to Mason Instrument in Cambridge. | 12th Mar 1937 | Box 138 \ 2 scan0096 | |
| Letter to the Cambridge Instrument Company regarding initial tests and a price request for an accelerometer. | 15th Mar 1937 | Box 138 \ 2 scan0097 | |
| Letter to A. Taub of Vauxhall Motors regarding an offer to send someone to make drawings of the Summers' Indicator apparatus. | 22th Mar 1937 | Box 138 \ 2 scan0098 | |
| Query regarding the status of experiments dealing with torsional vibration on Phantom III cars. | 22th Mar 1937 | Box 138 \ 2 scan0099 | |
| Letter to Vauxhall Motors regarding permission for a draughtsman to draw a Summers Indicator and a follow-up on oil grading. | 31th Mar 1937 | Box 138 \ 2 scan0100 | |
| Requesting the creation of a Summers Torsional Vibration Indicator by copying a successful design from the Vauxhall Co. | 2nd Apr 1937 | Box 138 \ 2 scan0101 | |
| Request to order an accelerometer for the skid pan from the Cambridge Instrument Co. | 6th May 1937 | Box 138 \ 2 scan0102 | |
| Letter to The Cambridge Instrument Co. Ltd. with feedback and suggestions for improving an accelerometer. | 14th May 1937 | Box 138 \ 2 scan0103 | |
| Letter from Cambridge Instrument Company regarding the cost and sensitivity of an accelerometer. | 17th Mar 1937 | Box 138 \ 2 scan0104 | |
| Continuation page of a letter from the Cambridge Instrument Company discussing an instrument for experimental work. | 19th May 1937 | Box 138 \ 2 scan0105 | |
| Letter from Cambridge Instrument Company regarding adjustments for a special accelerometer. | 19th May 1937 | Box 138 \ 2 scan0106 | |
| Request to order two 'Capstan No. 5' one-inch travel micrometer dial gauges for various measurement purposes. | 1st Jul 1937 | Box 138 \ 2 scan0107 | |
| Letter to Joseph Lucas Limited requesting information and cost for a high tension peak voltmeter for a car engine test bench. | 26th Jul 1937 | Box 138 \ 2 scan0108 | |
| Letter requesting information and prices for a magneto and voltmeter for road tests. | 26th Jul 1937 | Box 138 \ 2 scan0109 | |
| Inquiry to A.C. Sparking Plug Co., Ltd. about modified spark plugs for temperature measurement. | 26th Jul 1937 | Box 138 \ 2 scan0110 | |
| Letter to The Zenith Carburetter Co. Ltd. requesting information on a 'Zenith Mileage Tester'. | 26th Jul 1937 | Box 138 \ 2 scan0111 | |
| Letter to an instrument company outlining requirements for a device to measure distance during petrol consumption tests. | 4th Aug 1937 | Box 138 \ 2 scan0112 | |
| Page two of a letter regarding the normal speedometer drive from the gearbox. | 4th Aug 1937 | Box 138 \ 2 scan0113 | |
| Request to order one Zenith Mileage tester from the Zenith Carburetter Co. | 4th Aug 1937 | Box 138 \ 2 scan0114 | |
| Letter to Cambridge Instrument Co., Ltd. regarding the return of a faulty accelerometer. | 5th Aug 1937 | Box 138 \ 2 scan0115 | |
| Telegram to Instrument Cambridge rescheduling the delivery of an accelerometer. | 6th Aug 1937 | Box 138 \ 2 scan0116 | |
| Inquiry to Ferranti Ltd. regarding the wiring, operation, and mounting of a newly purchased synchronous stop clock. | 12th Aug 1937 | Box 138 \ 2 scan0117 | |
| Follow-up letter to Messrs Joseph Lucas Ltd. regarding a high tension peak voltmeter. | 18th Aug 1937 | Box 138 \ 2 scan0118 | |
| Letter to the Cambridge Instrument Co. regarding a faulty sideways accelerometer and a request for its urgent repair for experiments. | 28th Aug 1937 | Box 138 \ 2 scan0119 | |
| Letter from Cambridge Instrument Company confirming the safe receipt of an accelerometer. | 28th Aug 1937 | Box 138 \ 2 scan0120 | |
| Letter to Paul Dykes enquiring about an accelerometer and experiments on piston rings. | 30th Sep 1937 | Box 138 \ 2 scan0121 | |
| Letter to Cambridge Instrument Company regarding a faulty sideways accelerometer being returned for repair. | 4th Oct 1937 | Box 138 \ 2 scan0122 | |
| Request to make an inertia ring for a trial of the Summer's Torsion Indicator. | 23th Nov 1937 | Box 138 \ 2 scan0123 | |
| Installation and potential use of a new flash-butt welding machine for chassis components. | 25th Nov 1937 | Box 138 \ 2 scan0124 | |
| Request to order 10 rolls of paper for use with an 'Askania' vibration recording instrument. | 30th Nov 1937 | Box 138 \ 2 scan0125 | |
| Letter regarding a potential car swap, an accelerometer, and making 'back door' enquiries. | 2nd Dec 1937 | Box 138 \ 2 scan0126 | |
| Letter to a client regarding car maintenance issues and parts delivery. | 23th Dec 1937 | Box 138 \ 2 scan0127 | |
| Letter ordering a No.650 'Universal' photographic exposure meter from The Weston Electrical Instrument Co. Ltd. | 11th Feb 1938 | Box 138 \ 2 scan0128 | |
| Letter to a customer regarding spring loading a pedal and a request for the chassis number. | 17th Feb 1938 | Box 138 \ 2 scan0129 | |
| Proposing a modified assembly scheme for the oil level indicator on Bentley & Wraith models to improve the process. | 25th Mar 1938 | Box 138 \ 2 scan0130 | |
| Modification drawing for a Wraith oil level indicator. | 28th Mar 1938 | Box 138 \ 2 scan0131 | |
| Letter to The Lewis Engineering Co. Ltd. requesting further details about their pyrometer. | 28th Mar 1938 | Box 138 \ 2 scan0132 | |
| Letter requesting further information on the K.B.B. vibrometer from Messrs Kelvin Bottomley & Baird, Ltd. | 29th Mar 1938 | Box 138 \ 2 scan0133 | |
| Letter from Kelvin Bottomley & Baird Ltd. regarding the design limitations and frequency range of their K.B.B. Vibrometer. | 30th Mar 1935 | Box 138 \ 2 scan0134 | |
| Product information and operating instructions for the K.B.B. Vibrometer. | 30th Mar 1935 | Box 138 \ 2 scan0135 | |
| Technical leaflet describing the design and method of using the K.B.B. Vibrometer. | 1st Apr 1938 | Box 138 \ 2 scan0136 | |
| Urgent request for the modification and production of arms for a torsional indicator used in crankshaft development. | 1st Apr 1938 | Box 138 \ 2 scan0137 | |
| Brochure for the Cambridge Universal Vibrograph, detailing its stylus-on-celluloid method for recording vibrations. | 1st Apr 1938 | Box 138 \ 2 scan0138 | |
| Product sheet detailing the features and applications of the Cambridge Universal Vibrograph. | 4th May 1938 | Box 138 \ 2 scan0139 | |
| Notification of a blueprint for a G.CD.641 Modified Oil Level Plug for the Wraith III model. | 4th May 1938 | Box 138 \ 2 scan0140 | |
| Letter to Cambridge Instrument Co. Ltd. inquiring about the temperature effects on a sideways accelerometer and requesting a bill. | 9th May 1938 | Box 138 \ 2 scan0141 | |
| Letter from Cambridge Instrument Company discussing the price and calibration of a sideways accelerometer. | 13th May 1938 | Box 138 \ 2 scan0142 | |
| Invoice from Cambridge Instrument Co. Ltd. for a special accelerometer. | 16th May 1938 | Box 138 \ 2 scan0143 | |
| Authorising payment for a Cambridge Accelerometer to be used on the skid pan. | 17th May 1938 | Box 138 \ 2 scan0144 | |
| Invoice from S. Smith & Sons for instruments, and a request for a covering order to be issued for payment. | 18th May 1938 | Box 138 \ 2 scan0145 | |
| Order to be placed with S. Smith & Sons for instruments. | 18th May 1938 | Box 138 \ 2 scan0146 | |
| Requesting to pass an order to S. Smith & Sons for an all black petrol meter. | 26th May 1938 | Box 138 \ 2 scan0147 | |
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