| Description | Date | Identifier | |
| The test results of B.I. H.T. Cable reels, detailing which have passed or failed. | 6th Oct 1938 | Box 167 \ 3 img124 | |
| Request to forward a set of H.T. wires for the B.III No.8 Car being tested in France. | 22th Oct 1938 | Box 167 \ 3 img125 | |
| Instruction to fit B.I. Neoprene cable to all new engines for H.T. Wiring until further notice. | 1st Nov 1938 | Box 167 \ 3 img126 | |
| Letter from British Insulated Cables Ltd. concerning High Tension Ignition Cable and a proposed works visit. | 2nd Dec 1938 | Box 167 \ 3 img127 | |
| Letter from British Insulated Cables Ltd. proposing travel arrangements and train times for a works visit. | 5th Dec 1938 | Box 167 \ 3 img128 | |
| Letter to B.I. Cables Ltd. confirming travel arrangements for a visit to their Works at Helsby. | 5th Dec 1938 | Box 167 \ 3 img129 | |
| Letter from British Insulated Cables Ltd. confirming car arrangements for a works visit. | 6th Dec 1938 | Box 167 \ 3 img130 | |
| Letter requesting a descriptive booklet on Insulating Materials and Instrument Wires. | 14th Dec 1938 | Box 167 \ 3 img131 | |
| Cover letter from West Insulating Company, Ltd. enclosing a booklet. | 15th Dec 1938 | Box 167 \ 3 img132 | |
| The proposed wiring arrangement for the Bentley V thermostat switch and starting carburetter. | 3rd Jan 1939 | Box 167 \ 3 img133 | |
| Instruction to fit all experimental engines with a new, cheaper B.I. Neoprene high tension cable. | 11th Jan 1939 | Box 167 \ 3 img134 | |
| Arrangement of H.T. ignition wires for a distributor head and coil. | 11th Jan 1939 | Box 167 \ 3 img135 | |
| The comparative testing of low tension cables. | 19th Jan 1939 | Box 167 \ 3 img136 | |
| Technical specification and breakdown voltage test results for various types of electrical cables. | 19th Jan 1939 | Box 167 \ 3 img137 | |
| Test report on different types of electrical cables, detailing their dimensions and breakdown voltage. | 19th Jan 1939 | Box 167 \ 3 img138 | |
| Table of breakdown voltage tests for various types of electrical cables. | 19th Jan 1939 | Box 167 \ 3 img139 | |
| Letter from Muirhead & Co. offering a bitumastic compound to solve a sealing problem. | 21th Jan 1939 | Box 167 \ 3 img140 | |
| The investigation and testing of high tension cables for standardization. | 25th Jan 1939 | Box 167 \ 3 img141 | |
| Cost comparison of high tension cable from B.I. Neoprene and Johnson & Phillips. | 25th Jan 1939 | Box 167 \ 3 img142 | |
| Letter to Muirhead & Co. Ltd. requesting assistance in finding a suitable compound for filling and sealing ignition coils. | 26th Jan 1939 | Box 167 \ 3 img143 | |
| Letter from Muirhead & Co., Ltd. regarding samples of wax and bitumen sent for testing. | 1st Feb 1939 | Box 167 \ 3 img144 | |
| Agreeing to standardise the use of B.I. Neoprene (Taped Finish) High Tension cable for all chassis. | 3rd Feb 1939 | Box 167 \ 3 img145 | |
| Letter to Muirhead & Co. Ltd. acknowledging receipt of two wax samples for testing. | 4th Feb 1939 | Box 167 \ 3 img146 | |
| Proposal to cure ignition cable failures and misfires on the Wraith model. | 22th Feb 1939 | Box 167 \ 3 img147 | |
| Suggesting a new approval process for H.T. wire due to oversized diameter issues. | 23th Feb 1939 | Box 167 \ 3 img148 | |
| Letter from supplier British Insulated Cables Ltd. concerning order number 84004 and a material sample. | 3rd Mar 1939 | Box 167 \ 3 img149 | |
| Scheme for H.T. wiring for the HP Head, superseding a previous scheme for the Conventional Head. | 17th Apr 1939 | Box 167 \ 3 img150 | |
| Fault with Collett Ezetite terminals for the ignition coil high tension lead and a proposed solution. | 22th May 1939 | Box 167 \ 3 img151 | |
| Requesting the replacement of an obsolete H.T. cable with a new B.I. Neoprene cable. | 8th Jun 1939 | Box 167 \ 3 img152 | |
| Test results for B.I. Neoprene Cable, indicating which reels passed and which failed inspection. | 13th Jun 1939 | Box 167 \ 3 img153 | |
| Enquiry to a cable supplier for a salt-resistant H.T. cable suitable for a Marine Engine. | 28th Jul 1940 | Box 167 \ 3 img154 | |
| Request to obtain H.T. cable from British Insulated Cables Ltd., Prescot. | 7th Aug 1940 | Box 167 \ 3 img155 | |
| Pass and fail results from testing B.I. Neoprene H.T. Cable reels. | 24th Aug 1939 | Box 167 \ 3 img156 | |
| 1,000-hour endurance test on High Tension Neoprene cable. | 17th Jul 1939 | Box 167 \ 3 img157 | |
| The calibration of a Vulture Electric Petrol Gauge and a 28-gallon tank by Smiths. | 1st Mar 1941 | Box 167 \ 4 img001 | |
| Letter from S. Smith & Sons regarding the despatch schedule for a petrol gauge for a Bentley Vulture. | 15th Jan 1934 | Box 167 \ 4 img002 | |
| Letter from S. Smith & Sons confirming the despatch of a Petrol Gauge for a Bentley Vulture. | 24th Jan 1934 | Box 167 \ 4 img003 | |
| To Roy requesting an official order for Messrs. Smith & Sons to cover the fitting of a petrol gauge to a Phantom petrol tank. | 7th Feb 1934 | Box 167 \ 4 img004 | |
| Letter to S. Smith & Sons enclosing drawings for a Phantom Petrol Tank Body and a related Electrical Unit. | 7th Feb 1934 | Box 167 \ 4 img005 | |
| Letter from S. Smith & Sons regarding an enquiry about Petrol Gauges with modified coils. | 9th Feb 1934 | Box 167 \ 4 img006 | |
| Issues and proposed modifications for Bentley petrol feed systems, referencing tests on a Phantom model. | 17th May 1934 | Box 167 \ 4 img007 | |
| Dispensing with the petrol tap and proposals for the petrol pump and level indicator for the Spectre model. | 17th May 1934 | Box 167 \ 4 img008 | |
| Letter to S. Smith & Sons Ltd. proposing a modification to the petrol gauge to include a low-fuel warning light. | 18th May 1934 | Box 167 \ 4 img009 | |
| Letter from S. Smith & Sons regarding a newly designed petrol gauge with a warning device. | 22th May 1934 | Box 167 \ 4 img010 | |
| Approaching supplier Smiths to incorporate a warning light into the Bentley petrol gauge system. | 23th May 1934 | Box 167 \ 4 img011 | |
| Letter from S. Smith & Sons regarding the development and proposal for a 3-wire petrol gauge with a warning light. | 23th May 1934 | Box 167 \ 4 img012 | |
| Letter to S. Smith & Sons Ltd. regarding a petrol gauge with a warning light and its tank attachment. | 24th May 1934 | Box 167 \ 4 img013 | |
| Letter regarding sending a sample electric petrol gauge with a low-fuel warning light. | 28th May 1934 | Box 167 \ 4 img014 | |
| Letter to Mr. G. Manwaring inviting him to discuss the design of a new three-wire type gauge with a warning light. | 29th May 1934 | Box 167 \ 4 img015 | |
| Faulty petrol tank unit for Bentley chassis B-145-AE. | 31th May 1934 | Box 167 \ 4 img016 | |
| Letter from S. Smith & Sons regarding delays and progress on an experimental Bentley instrument layout. | 5th Jun 1934 | Box 167 \ 4 img017 | |
| Letter from S. Smith & Sons regarding a suggested dial scheme to be shown. | 25th Jun 1934 | Box 167 \ 4 img018 | |
| Letter from S. Smith & Sons regarding an investigation into an erratic petrol gauge on a Bentley car. | 25th Jun 1934 | Box 167 \ 4 img019 | |
| Letter to S. Smith & Sons regarding a dispute over the cause of faulty petrol gauges. | 27th Jun 1934 | Box 167 \ 4 img020 | |
| Letter from S. Smith & Sons acknowledging a report of defective petrol gauges and agreeing to send a representative. | 29th Jun 1934 | Box 167 \ 4 img021 | |
| Dispatch request to S. Smith & Sons for the return of a loaned single wire petrol gauge and tank unit. | 5th Jul 1934 | Box 167 \ 4 img022 | |
| Faulty Smith's Petrol Gauge Tank Unit from a Bentley Chassis and the process for its replacement. | 5th Jul 1934 | Box 167 \ 4 img023 | |
| Two faulty Smiths petrol gauge tank units removed from a Bentley Chassis on test. | 10th Jul 1934 | Box 167 \ 4 img024 | |
| Instruction to fit a special electric petrol gauge to chassis 1.B.IV. | 16th Jul 1934 | Box 167 \ 4 img025 | |
| Faulty petrol gauge for a Bentley Chassis, piece number DB.154. | 17th Jul 1934 | Box 167 \ 4 img026 | |
| Blueprint LeC.4041 for an experimental anti-search baffle in a petrol tank. | 17th Jul 1934 | Box 167 \ 4 img027 | |
| Letter to S. Smith & Sons Ltd. regarding faulty petrol gauges and requesting an inspection. | 17th Jul 1934 | Box 167 \ 4 img028 | |
| Proposal to replace the petrol reserve tap on a Bentley with a system of three warning lights. | 18th Jul 1934 | Box 167 \ 4 img029 | |
| Letter from S. Smith & Sons arranging for an engineer to investigate faulty Tank Units and a Petrol Meter. | 18th Jul 1934 | Box 167 \ 4 img030 | |
| Advocating for the replacement of a reserve tap with a petrol warning light on Bentley and Rolls-Royce cars. | 19th Jul 1934 | Box 167 \ 4 img031 | |
| Request to fit an instrument patch and an electric petrol gauge with an anti-surge baffle to a Bentley chassis. | 19th Jul 1934 | Box 167 \ 4 img032 | |
| Request to urgently order a second experimental electric petrol gauge with a reserve warning light for a Bentley from Messrs. Smiths. | 19th Jul 1934 | Box 167 \ 4 img033 | |
| Faulty Smith petrol gauge tank units for a Bentley chassis. | 20th Jul 1934 | Box 167 \ 4 img034 | |
| The return of a petrol meter to S. Smith & Sons Ltd. for recalibration. | 20th Jul 1934 | Box 167 \ 4 img035 | |
| Letter requesting the urgent marking of a petrol gauge dial for a Bentley race car for the Ulster T.T. race. | 20th Jul 1934 | Box 167 \ 4 img036 | |
| Letter from S. Smith & Sons regarding a delayed letter and confirming the return of a petrol gauge dial by post. | 23th Jul 1934 | Box 167 \ 4 img037 | |
| Letter from S. Smith & Sons regarding a proposed electric petrol gauge with a warning light for a Bentley car. | 24th Jul 1934 | Box 167 \ 4 img038 | |
| Letter from S. Smith & Sons to Rolls Royce regarding a report on faulty Petrol Tank Gauge Units and a Petrol Meter. | 27th Jul 1934 | Box 167 \ 4 img039 | |
| Letter to S. Smith & Sons regarding unsatisfactory results from an electric petrol gauge for a Bentley chassis and requesting a new sample. | 30th Jul 1934 | Box 167 \ 4 img040 | |
| Letter from S. Smith & Sons concerning issues with a sample petrol gauge with a warning light. | 31th Jul 1934 | Box 167 \ 4 img041 | |
| Letter to S. Smith & Sons Ltd. regarding the required petrol reserve quantity and receipt of a gauge for experimental purposes. | 1st Aug 1934 | Box 167 \ 4 img042 | |
| Letter from S. Smith & Sons concerning a sample petrol gauge with warning light contacts. | 2nd Aug 1934 | Box 167 \ 4 img043 | |
| Letter to S. Smith & Sons Ltd. requesting the personal delivery of a second petrol gauge and to discuss test results. | 9th Aug 1934 | Box 167 \ 4 img044 | |
| Letter from S. Smith & Sons regarding modifications to a sample petrol gauge and warning light. | 14th Aug 1934 | Box 167 \ 4 img045 | |
| Letter to S. Smith & Sons Ltd. regarding a fault with electric petrol gauges and requesting a new experimental design. | 17th Sep 1934 | Box 167 \ 4 img046 | |
| The unsatisfactory rubber covering of the triple core petrol gauge flex and a suggestion for improvement. | 17th Sep 1934 | Box 167 \ 4 img047 | |
| Internal memorandum about failures with electric petrol gauges and the need for an investigation. | 17th Sep 1934 | Box 167 \ 4 img048 | |
| Letter from S. Smith & Sons regarding improvements to electric petrol gauges and floats. | 19th Sep 1934 | Box 167 \ 4 img049 | |
| Letter from S. Smith & Sons proposing a new design for a Petrol Gauge Cable due to deterioration of the existing rubber covering. | 21th Sep 1934 | Box 167 \ 4 img050 | |
| Failure of an electric petrol gauge and the development of an improved version with a new float. | 21th Sep 1934 | Box 167 \ 4 img051 | |
| Letter from S. Smith & Sons (Motor Accessories) Ltd regarding an increase in the thickness of a fixing plate. | 5th Oct 1934 | Box 167 \ 4 img052 | |
| Letter to S. Smith & Sons Ltd. agreeing to an increase in thickness for an electric petrol gauge fixing plate. | 8th Oct 1934 | Box 167 \ 4 img053 | |
| Letter to S. Smith & Sons Ltd. regarding modifications made to a cast aluminium petrol gauge being fitted to a Bentley car. | 24th Oct 1934 | Box 167 \ 4 img054 | |
| Modified electrical gauge tank unit for a Bentley chassis petrol tank. | 21th Nov 1934 | Box 167 \ 4 img055 | |
| Letter from S. Smith & Sons regarding a proposed tank attachment and an enclosed blueprint for a casting. | 23th Nov 1934 | Box 167 \ 4 img056 | |
| Letter to S. Smith & Sons Ltd. regarding a missing print for a proposed tank attachment. | 26th Nov 1934 | Box 167 \ 4 img057 | |
| Letter from S. Smith & Sons regarding a blueprint, a casting, and a proposal to reduce the thickness of a flange. | 26th Nov 1934 | Box 167 \ 4 img058 | |
| Missing Petrol Gauge with reserve warning light contacts, for which an invoice has been received from S. Smith & Sons. | 7th Dec 1934 | Box 167 \ 4 img059 | |
| Confirming receipt of a petrol gauge and instructions for booking it in. | 10th Dec 1934 | Box 167 \ 4 img060 | |
| Letter from S. Smith & Sons regarding an order for two new Electric Petrol Gauges for a Phantom II. | 13th Dec 1934 | Box 167 \ 4 img061 | |
| Request to order two Smith electric petrol gauges for Spectre with Phantom II calibration. | 17th Dec 1934 | Box 167 \ 4 img062 | |
| Letter from a supplier requesting drawings for petrol gauges with warning lights for the 'Phantom 2' model. | 18th Dec 1934 | Box 167 \ 4 img063 | |
| Letter to Messrs. S. Smith & Sons Ltd. regarding a new petrol tank blueprint and meter design. | 19th Dec 1934 | Box 167 \ 4 img064 | |
| Letter from S. Smith & Sons regarding specifications for 'Phantom' Tank petrol gauges and requesting a new blueprint. | 21th Dec 1934 | Box 167 \ 4 img065 | |
| Letter to Messrs. S. Smith & Sons Ltd. regarding a blueprint. | 28th Dec 1934 | Box 167 \ 4 img066 | |
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