| Description | Date | Identifier | |
| Weight savings achieved and proposed for tool kit items like box spanners and a Dunlop jack. | 5th Mar 1935 | Box 155 \ 4 scan0115 | |
| Proposals to revise the Bentley tool kit to save weight and lighten the Dunlop jack. | 18th Mar 1935 | Box 155 \ 4 scan0116 | |
| Proposed weight savings for the Bentley Tool Kit, specifically the wheel spanner and hammer. | 3rd Apr 1935 | Box 155 \ 4 scan0117 | |
| Proposed saving on the Bentley Tool Kit, referencing previous designs for the wheel spanner and hammer. | 3rd Apr 1935 | Box 155 \ 4 scan0118 | |
| Inquiry for further information about the lightened Dunlop jack for the Bentley Tool Kit. | 26th Apr 1935 | Box 155 \ 4 scan0119 | |
| Inquiry regarding the implementation date for the revised Bentley tool kit scheme. | 15th May 1935 | Box 155 \ 4 scan0120 | |
| Introduction of a revised Bentley tool kit for the 'F' series and the rejection of a lightened jack. | 16th May 1935 | Box 155 \ 4 scan0121 | |
| The introduction of a revised Bentley Tool Kit for the 'F' series. | 22th May 1935 | Box 155 \ 4 scan0122 | |
| Design of double-ended jaw spanners for car tool kits. | 11th Sep 1935 | Box 155 \ 4 scan0123 | |
| The four different spanner sizes required for the rear axle of the Phantom III and the proposed deletion of a specific key. | 5th Feb 1936 | Box 155 \ 4 scan0124 | |
| Request to include a specific tappet spanner in the tool kits for Phantom III & 25 HP cars. | 5th Mar 1936 | Box 155 \ 4 scan0125 | |
| The inclusion of a .015' feeler gauge in the tool kits for the 4¼ Litre Bentley. | 9th Mar 1936 | Box 155 \ 4 scan0126 | |
| Removal of the Schrader Universal pump connection from tool kits to reduce chassis costs. | 3rd Apr 1936 | Box 155 \ 4 scan0127 | |
| Recommendation to remove the Schrader Universal pump connection from all tool kits as it is deemed unnecessary. | 8th Apr 1936 | Box 155 \ 4 scan0128 | |
| Instructing the removal of the Schrader Universal Pump Connection from spares equipment once stock is depleted. | 15th Apr 1936 | Box 155 \ 4 scan0129 | |
| Removing the distributor cam on Bentley and 20/25 HP cars, warning against bending the spindle by using a screwdriver. | 12th Jun 1936 | Box 155 \ 4 scan0130 | |
| Removal of the distributor cam on Bentley and 25/30HP cars and clarifying the number of cam extractors available. | 12th Jun 1936 | Box 155 \ 4 scan0131 | |
| Instructions for a flexible petrol can nozzle for Phantom III and Bentley chassis tool kits. | 3rd Feb 1937 | Box 155 \ 4 scan0132 | |
| Throttle body distortion in a 4.25-litre Bentley, potentially caused by non-standard spanners and washer design. | 8th Jun 1937 | Box 155 \ 4 scan0133 | |
| Blueprint of a throttle flange joint for 4 1/4 Litre and 3 1/2 Litre engines. | 6th Dec 1937 | Box 155 \ 4 scan0134 | |
| Proposed list of tools and prices for the Bentley 50 tool kit. | 6th Dec 1937 | Box 155 \ 4 scan0135 | |
| Priced list of various spanners, bars, and tools. | 6th Dec 1937 | Box 155 \ 4 scan0136 | |
| Cost savings on the standard Bentley tool kit and spares by omitting or changing certain items. | 3rd Feb 1938 | Box 155 \ 4 scan0137 | |
| List of tools to form the Wraith tool kit. | 3rd Feb 1938 | Box 155 \ 4 scan0138 | |
| Requesting an order for six sets of spanners and tools for the Wraith III chassis. | 9th Feb 1938 | Box 155 \ 4 scan0139 | |
| Method for housing tool kits on the new Bentley S.B.J. body. | 20th Sep 1938 | Box 155 \ 4 scan0140 | |
| Photograph of a car's rear, featuring a boot lid that folds down into a luggage rack. | 20th Sep 1938 | Box 155 \ 4 scan0141 | |
| Rear view of a saloon car showing the open boot lid with an integrated toolkit. | 22th Sep 1938 | Box 155 \ 4 scan0142 | |
| Letter from coachbuilder Park Ward & Co. Ltd. concerning the method for housing tool kits. | 22th Sep 1938 | Box 155 \ 4 scan0143 | |
| List of tools deleted from the Bentley V standard tool kit. | 5th Apr 1939 | Box 155 \ 4 scan0144 | |
| List of tools to be carried in the Bentley V car. | 5th Apr 1939 | Box 155 \ 4 scan0145 | |
| List of tools and spares for garage use for the Bentley V model, including spares for spring gaiters. | 5th Apr 1939 | Box 155 \ 4 scan0146 | |
| Covering note for a proposed list of tools and spares for the Bentley V. | 26th Jun 1939 | Box 155 \ 4 scan0147 | |
| Rationalisation of tool kits for different car models. | 22th Jan 1940 | Box 155 \ 4 scan0148 | |
| Proposal for a revised car tool kit for various models, including a list of discarded tools and specific spanner alterations. | 22th Jan 1940 | Box 155 \ 4 scan0149 | |
| Special tool for the Silver Ghost chassis and attached lists for tool kits and spares. | 22th Jan 1940 | Box 155 \ 4 scan0150 | |
| Suggested tool kit list with part numbers and notes on required changes. | 22th Jan 1940 | Box 155 \ 4 scan0151 | |
| List of discarded tools, spares, and accessories. | 22th Jan 1940 | Box 155 \ 4 scan0152 | |
| List of parts included in the Continental Spares Kit. | 22th Jan 1940 | Box 155 \ 4 scan0153 | |
| Requesting an inquiry to Armstrong, Stevens & Son regarding the supply of various spanners. | 4th Mar 1940 | Box 155 \ 4 scan0154 | |
| The storage of road tools in experimental cars. | 5th Apr 1940 | Box 155 \ 4 scan0155 | |
| List of requested inspection tools for the Chassis Section, including itemized costs. | 11th Feb 1941 | Box 155 \ 4 scan0156 | |
| The unsatisfactory progress by Motor Panels Coventry in locating and storing press tools for B.V. bodies. | 28th Feb 1941 | Box 155 \ 4 scan0157 | |
| Letter to Motor Body Panels Ltd. regarding missing, misplaced, and rusting tools for B.V. bodies and requesting information for future production. | 28th Feb 1941 | Box 155 \ 4 scan0158 | |
| Letter regarding the unsatisfactory condition and storage of tools, emphasizing the need for proper care. | 28th Feb 1941 | Box 155 \ 4 scan0159 | |
| Requesting feedback and remarks on an R.P. Adjustable Thermostat. | 4th May 1929 | Box 156 \ 1 scan0001 | |
| Requesting a test of an R.P. adjustable thermostat's opening characteristics. | 7th May 1929 | Box 156 \ 1 scan0002 | |
| Testing status of an R.P. Adjustable Thermostat. | 29th May 1929 | Box 156 \ 1 scan0003 | |
| Laboratory report on the calibration of an R.P. Adjustable thermostat, noting an inability to test under a water head and observations of a lag in operation. | 7th May 1929 | Box 156 \ 1 scan0004 | |
| Hand-drawn diagram illustrating the operational range and settings of a valve. | 13th May 1929 | Box 156 \ 1 scan0005 | |
| Forwarding a copy of a letter from the R.P. Adjustable Thermostat Co. Ltd. | 13th May 1929 | Box 156 \ 1 scan0006 | |
| Letter from The R.P. Adjustable Thermostat Co. Ltd. regarding continued tests and a potential spring tension issue. | 10th May 1929 | Box 156 \ 1 scan0007 | |
| Promotional leaflet for the R.P. Adjustable Thermostat, an aftermarket device to control engine temperature. | 10th May 1929 | Box 156 \ 1 scan0008 | |
| Leaflet detailing the features, operation, fitting instructions, and price of the 'R.P.' Adjustable Thermostat. | 2nd Feb 1929 | Box 156 \ 1 scan0009 | |
| Article reprint discussing the performance and fuel economy benefits of the 'R.P.' Adjustable Thermostat. | 2nd Feb 1929 | Box 156 \ 1 scan0010 | |
| Extract from a newspaper article by the Earl of March detailing the benefits of fitting an adjustable thermostat to a car. | 10th Feb 1929 | Box 156 \ 1 scan0011 | |
| Cablegram from Segrave in Daytona Beach confirming the satisfactory function of a thermostat. | 12th Mar 1929 | Box 156 \ 1 scan0012 | |
| Advertisement and fitting guide for the R.P. Adjustable Thermostat and Dashboard Thermometer. | 26th Jun 1929 | Box 156 \ 1 scan0013 | |
| Unsatisfactory adjustable thermostat returned to stores after testing. | 26th Jun 1929 | Box 156 \ 1 scan0014 | |
| Faults with an R.P. Adjustable Thermostat, specifically a spring issue causing flutter, and suggesting a modification. | 1st Jun 1929 | Box 156 \ 1 scan0015 | |
| 'R.P.' Patent Thermostatic Vacuum-Operated Shutters offered by The Houdaille Hydraulic Suspension Co., Ltd. | 14th Oct 1930 | Box 156 \ 1 scan0016 | |
| Letter from The Houdaille Hydraulic Suspension Co. regarding their patent thermostatic vacuum-operated shutters. | 13th Oct 1930 | Box 156 \ 1 scan0017 | |
| From The Houdaille Hydraulic Suspension Co. detailing the 'R.P.' patent thermostatic-vacuum control for radiator shutters. | 1st Oct 1930 | Box 156 \ 1 scan0018 | |
| Scheme for thermostat vacuum-operated shutters and arranging a visit to a stand at Olympia. | 18th Oct 1930 | Box 156 \ 1 scan0019 | |
| Further information received from suppliers about thermostat vacuum-operated shutters. | 20th Oct 1930 | Box 156 \ 1 scan0020 | |
| Letter from The Houdaille Hydraulic Suspension Co., Ltd. regarding a patent thermostat vacuum control for radiator shutters. | 18th Oct 1930 | Box 156 \ 1 scan0021 | |
| Article discussing the development and operation of suction-operated radiator shutters. | 14th Oct 1930 | Box 156 \ 1 scan0022 | |
| The sale of rights for the R.P. Adjustable Thermostat from Houdaille to S. Smith & Sons. | 14th May 1931 | Box 156 \ 1 scan0023 | |
| Letter from Crosby Valve & Engineering Co Ltd regarding a misunderstanding about the operating temperature of radiator thermostats. | 9th Feb 1933 | Box 156 \ 1 scan0024 | |
| Letter from Crosby Valve & Engineering Co. Ltd. detailing the results and methodology of thermostat testing. | 9th Feb 1933 | Box 156 \ 1 scan0025 | |
| The despatch of sample thermostats to The Crosby Valve & Engineering Co. | 16th Feb 1933 | Box 156 \ 1 scan0026 | |
| Letter to The Crosby Valve & Engineering Co regarding testing and fitting issues with six sample thermostats. | 16th Feb 1933 | Box 156 \ 1 scan0027 | |
| Letter from Crosby Valve & Engineering Co Ltd regarding the return of sample thermostats. | 17th Feb 1933 | Box 156 \ 1 scan0028 | |
| Blueprint showing a cross-section and top view of a mechanical assembly. | 17th Feb 1933 | Box 156 \ 1 scan0029 | |
| Blueprint showing a section and plan view of a friction-style shock absorber with a lever arm. | 17th Feb 1933 | Box 156 \ 1 scan0030 | |
| Instruction sheet for the R.P. Adjustable Thermostat and Smith's engine temperature thermometers. | 17th Feb 1933 | Box 156 \ 1 scan0031 | |
| Fitting instructions for a Smith Radiator Thermometer and associated gauges. | 17th Feb 1933 | Box 156 \ 1 scan0032 | |
| Adjustment and fitting instructions for the Smith 'R.P.' Adjustable Thermostat. | 17th Feb 1933 | Box 156 \ 1 scan0033 | |
| Informational leaflet with fitting instructions for a Smith R.P. Adjustable Thermostat. | 9th Jan 1934 | Box 156 \ 1 scan0034 | |
| Test report comparing 'Packless Gland Co.' and 'Smith's Standard' calorstats. | 9th Jan 1934 | Box 156 \ 1 scan0035 | |
| Graph from calorstat tests comparing a Smith's standard production model with a packless gland type. | 27th Dec 1933 | Box 156 \ 1 scan0036 | |
| Graph comparing the performance of Smith's 'H' filling and 'Packless Gland' type calorstats after 10,000 miles. | 27th Dec 1933 | Box 156 \ 1 scan0037 | |
| Diagram illustrating the operation and applied loads of a thermostat-controlled shutter mechanism. | 5th Jul 1934 | Box 156 \ 1 scan0038 | |
| Experimental modifications to the Bentley Water Temperature Regulator to avoid corrosion. | 5th Jul 1934 | Box 156 \ 1 scan0039 | |
| Tests and modifications to a Bentley Thermostat. | 6th Jul 1934 | Box 156 \ 1 scan0040 | |
| Testing of thermostats for Bentley cars, which were found to be reading high. | 6th Jul 1934 | Box 156 \ 1 scan0041 | |
| Bentley thermostats, their specifications, and anticipated performance compared to radiator shutters. | 12th Jul 1934 | Box 156 \ 1 scan0042 | |
| Design alterations and testing for Bentley thermostats and air intake systems. | 13th Jul 1934 | Box 156 \ 1 scan0043 | |
| Letter from Corfield Ltd. regarding the development and potential application of Rototherm bi-metal thermometers for motor cars. | 1st Sep 1934 | Box 156 \ 1 scan0044 | |
| Advertisement leaflet for Rototherm thermometers, comparing them to older mercury-based models. | 1st Sep 1934 | Box 156 \ 1 scan0045 | |
| Advertising leaflet for the Rototherm dial thermometer, detailing its advantages and various models. | 1st Sep 1934 | Box 156 \ 1 scan0046 | |
| Product leaflet advertising the 'Rototherm', a new thermometer with a speedometer-style dial. | 17th May 1934 | Box 156 \ 1 scan0047 | |
| Drawing illustrating various types and configurations of dial gauges and fittings. | 17th May 1934 | Box 156 \ 1 scan0048 | |
| Quotation request form for a Rototherm dial indicating thermometer. | 17th May 1934 | Box 156 \ 1 scan0049 | |
| Technical data sheet for Rototherm dial indicating thermometers. | 20th Dec 1933 | Box 156 \ 1 scan0050 | |
| Report from the National Physical Laboratory on the examination of a Fahrenheit scale thermometer. | 20th Dec 1933 | Box 156 \ 1 scan0051 | |
| Report from the National Physical Laboratory on the examination and calibration of a Fahrenheit scale thermometer. | 20th Dec 1933 | Box 156 \ 1 scan0052 | |
| The purchase of a Rototherm Thermometer from Corfield Ltd. | 4th Sep 1934 | Box 156 \ 1 scan0053 | |
| Requesting a study into bi-metal thermostats for hot spot control and a review of radiator designs. | 21th Nov 1934 | Box 156 \ 1 scan0054 | |
| Internal request to the Order Office to purchase the book 'Thermostats'. | 21th Nov 1934 | Box 156 \ 1 scan0055 | |
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