| Description | Date | Identifier | |
| Cover note forwarding a copy of a letter sent to Messrs. S.U. Co. | 9th Oct 1933 | Box 163 \ 1 img015 | |
| Letter to The S.U. Company confirming the results of a discussion regarding various technical points. | 7th Oct 1933 | Box 163 \ 1 img016 | |
| List of proposed and agreed-upon modifications for an electrical component's assembly and materials. | 7th Oct 1933 | Box 163 \ 1 img017 | |
| List of agreed design changes for pump components, including studs, nuts, vent holes, and shrouds. | 7th Oct 1933 | Box 163 \ 1 img018 | |
| Fitting of vertical suction tubes and the inclusion of a fuse for each pump. | 7th Oct 1933 | Box 163 \ 1 img019 | |
| Location of a bakelite moulding on a pump body and a proposed design revision. | 9th Oct 1933 | Box 163 \ 1 img020 | |
| Requesting prices for 185 complete electric petrol pumps for the 3.5 Litre Bentley, listing the associated drawing numbers. | 10th Oct 1933 | Box 163 \ 1 img021 | |
| Letter from Simms Motor Units Ltd. regarding an unsuitable sample petrol filter. | 8th Mar 1934 | Box 163 \ 1 img022 | |
| Letter to S.U. Carburetter Co. Ltd. questioning the design of contact points in petrol pumps. | 2nd Jul 1934 | Box 163 \ 1 img023 | |
| The resistance values of S.U. petrol pump windings. | 5th Jul 1934 | Box 163 \ 1 img025 | |
| Production standstill due to delays with S.U. petrol pumps. | 29th Aug 1934 | Box 163 \ 1 img026 | |
| Specification for modification of a S-B-IV chassis prior to 10,000 miles trials. | 27th Oct 1934 | Box 163 \ 1 img027 | |
| Parts list and modification instructions for front springs, oil pipes, front axle control, and rear axle. | 22th Oct 1934 | Box 163 \ 1 img028 | |
| List of modifications and parts for vehicle components including brakes, exhaust, and suspension. | 22th Oct 1934 | Box 163 \ 1 img029 | |
| List of modifications and associated part numbers for rear brakes, a petrol pump, and a water pump. | 3rd Mar 1936 | Box 163 \ 1 img030 | |
| Internal order memo for an ACFIL pump for the Electrical Experimental Laboratory. | 3rd Mar 1936 | Box 163 \ 1 img031 | |
| Proposal to delete the fuse from the petrol pump and mount it as a separate unit on the dashboard for the Phantom III. | 14th Oct 1936 | Box 163 \ 1 img032 | |
| Test report on a dimmer switch resistance wire, noting high temperatures and suggesting design improvements. | 18th Nov 1936 | Box 163 \ 1 img033 | |
| Instructions for fitting a Hobsons' petrol gauge to a Phantom III chassis petrol tank. | 5th Sep 1936 | Box 163 \ 1 img034 | |
| The parts for a 'Phantom III' fuse unit for use with petrol pumps, to be fitted as a separate unit on the dashboard. | 16th Oct 1936 | Box 163 \ 1 img035 | |
| Letter from H.M. Hobson Ltd. arranging a visit to fit a calibrated petrol tank. | 4th Dec 1937 | Box 163 \ 1 img036 | |
| Letter to Mr. Reigate regarding the delayed installation of a special petrol tank. | 5th Jan 1937 | Box 163 \ 1 img037 | |
| Instruction to arrange for the fitting of petrol pumps and wiring to chassis 33-EX, 35-EX, and 37-EX. | 9th Sep 1937 | Box 163 \ 1 img038 | |
| Modifications, improvements, and wear issues concerning the S.U. petrol pump. | 21th Feb 1938 | Box 163 \ 1 img039 | |
| The wear characteristics and endurance testing of contact breaker points for a pump. | 21th Jan 1938 | Box 163 \ 1 img040 | |
| Updated petrol pump design for Bentley III and Bentley 50 chassis. | 5th Sep 1938 | Box 163 \ 1 img041 | |
| List of blueprints for an electrically operated reserve petrol tap for a Bentley III vehicle. | 31th Oct 1938 | Box 163 \ 1 img042 | |
| Instruction to prepare three sets of test parts for a Bentley III unit. | 31th Oct 1938 | Box 163 \ 1 img043 | |
| Provision of blueprints for a new 18-gallon petrol gauge for the Bentley 50 and Silver Wraith models. | 2nd Nov 1938 | Box 163 \ 1 img044 | |
| The condition of a modified high-pressure petrol pump after a 15,000-mile test in France. | 21th Nov 1938 | Box 163 \ 1 img045 | |
| Alteration notice for petrol pumps on Bentley V & Bentley 50 models, adding new parts suitable for 'Olive' Joints. | 22th Dec 1938 | Box 163 \ 1 img046 | |
| Requesting three more petrol reserve tap units for specific chassis. | 16th Jan 1939 | Box 163 \ 1 img047 | |
| Instruction to put in hand return springs for the petrol reserve tap, which replace part DW.838. | 1st Feb 1939 | Box 163 \ 1 img048 | |
| Instructions for modifying an electrically operated petrol reserve tap for Bentley V & Bentley 50 models. | 23th Feb 1939 | Box 163 \ 1 img049 | |
| Parts list and manufacturing instructions for solenoid and valve components, marked as page 2. | 23th Feb 1939 | Box 163 \ 1 img050 | |
| Test report comparing electrically operated petrol reserve taps with different coil windings. | 1st Apr 1939 | Box 163 \ 1 img051 | |
| Test results for pull-in voltage, current consumption, and temperature rise for three different tap models. | 1st Apr 1939 | Box 163 \ 1 img052 | |
| Graph plotting armature current against coil voltage for a continuous ignition tractor. | 15th May 1939 | Box 163 \ 1 img053 | |
| The condition and wear of an S.U. Petrol Pump after 50,300 miles of use. | 15th May 1939 | Box 163 \ 1 img054 | |
| Inspection report detailing issues found in a pump and its components after 18,000 miles. | 15th May 1939 | Box 163 \ 1 img055 | |
| Stating a decision to continue using the bought-out electrically operated petrol reserve tap. | 16th May 1940 | Box 163 \ 1 img056 | |
| Design of an in-house electrically operated petrol reserve tap versus a bought-out unit. | 14th May 1940 | Box 163 \ 1 img057 | |
| Letter from S. Smith & Sons regarding a test of the Dickenson Pump. | 25th Sep 1940 | Box 163 \ 1 img058 | |
| Arranging a meeting with the Engineering Branch at Scotland Yard concerning wireless screening. | 26th Nov 1931 | Box 163 \ 2 img001 | |
| Information from Scotland Yard about battery ignition and wireless interference in London Police vehicles. | 25th Nov 1931 | Box 163 \ 2 img002 | |
| The problems of ignition screening for a 20/25 engine in a light tank, comparing battery and magneto systems. | 4th Aug 1932 | Box 163 \ 2 img003 | |
| On ignition system tests, radio interference suppression for Scotland Yard cars, and a simpler switchbox design. | 1st Aug 1932 | Box 163 \ 2 img004 | |
| Outlining modifications and supply details for 20/25 HP engines for tanks ordered by the War Office. | 5th Aug 1932 | Box 163 \ 2 img005 | |
| Ignition screening experiments for a 20/25 engine intended for a light tank. | 16th Aug 1932 | Box 163 \ 2 img006 | |
| Recommendation to reduce spark plug gaps for tank engines with screened ignition systems. | 6th Aug 1932 | Box 163 \ 2 img007 | |
| Request to test the maximum sparking gap for a 20/25 engine with screened ignition in a light tank. | 18th Aug 1932 | Box 163 \ 2 img008 | |
| Letter regarding the wireless screening of a 20/25 HP tank engine. | 27th Aug 1932 | Box 163 \ 2 img009 | |
| Letter from The War Office regarding the frequency bands for light tank wireless sets. | 25th Aug 1932 | Box 163 \ 2 img010 | |
| Wireless screening of a 20/25 tank engine and potential radio interference issues. | 29th Aug 1932 | Box 163 \ 2 img011 | |
| Methods for screening against wireless radio interference in vehicles. | 17th Nov 1932 | Box 163 \ 2 img012 | |
| Methods for screening against wireless interference from sparking plugs when fitting a radio. | 17th Nov 1932 | Box 163 \ 2 img013 | |
| Suggesting improvements for the screening of battery ignition systems on 2/25 tank engines. | 18th Nov 1932 | Box 163 \ 2 img014 | |
| Suggestions for improving aero engine electrical systems to fulfill Air Ministry obligations for radio installations. | 18th Nov 1932 | Box 163 \ 2 img015 | |
| Screening for wireless interference on cars, specifically ignition resistance and dynamo chokes. | 18th Nov 1932 | Box 163 \ 2 img016 | |
| Advice from Marconi's Wireless Telegraph Company on suppressing electrical interference from the dynamo and ignition systems. | 25th Nov 1932 | Box 163 \ 2 img017 | |
| Page two of a letter discussing H.T. chokes and coil ignition systems for S.W. reception. | 25th Nov 1932 | Box 163 \ 2 img018 | |
| Development and contract amendment for a battery ignition screening system for the Light Tank 20/25 engine. | 25th Nov 1932 | Box 163 \ 2 img019 | |
| Record of an agreement concerning modifications, additional expenses, and scheduling a wireless test for a second installation. | 26th Nov 1932 | Box 163 \ 2 img020 | |
| Letter to Marconi Wireless Telegraph Co. Ltd. regarding information on wireless screening and a subsequent invitation. | 28th Nov 1932 | Box 163 \ 2 img021 | |
| Covering memo referencing an attached note sent to PN. | 16th Dec 1932 | Box 163 \ 2 img022 | |
| Wireless screening requirements for a 20/25 tank engine's battery ignition system. | 21th Dec 1932 | Box 163 \ 2 img023 | |
| H.T. cable suitability and proposing a standard armoured cable for tank operation. | 21th Dec 1932 | Box 163 \ 2 img024 | |
| Cover note forwarding a letter concerning the screening of engine ignition. | 21th Dec 1932 | Box 163 \ 2 img025 | |
| Letter to Major Carter requesting particulars and loan of choke and condenser units for ignition testing. | 21th Dec 1932 | Box 163 \ 2 img026 | |
| The screening of battery ignition on a 20/25 tank installation for wireless testing. | 23th Dec 1932 | Box 163 \ 2 img027 | |
| Cover note forwarding a letter from the Signals Experimental Establishment regarding choke and condenser values for tank L.T. circuits. | 30th Dec 1932 | Box 163 \ 2 img028 | |
| Letter from the Signals Experimental Establishment regarding choke and condenser specifications for ignition tests. | 29th Dec 1932 | Box 163 \ 2 img029 | |
| Confirming the handover of a choke and condenser for testing on a Tank L.T. ignition circuit. | 2nd Jan 1933 | Box 163 \ 2 img030 | |
| Tests conducted on the effect of a choke and condenser on the 20/25 HP battery ignition system for tank engines. | 11th Jan 1933 | Box 163 \ 2 img031 | |
| Dynamo testing, choke additions, and control brush settings for tank engines. | 11th Jan 1933 | Box 163 \ 2 img032 | |
| Wireless interference tests conducted on a 20/25HP engine fitted to a light tank. | 27th Jan 1933 | Box 163 \ 2 img033 | |
| Wireless interference and telephonic reception concerning a tank's screening. | 27th Jan 1933 | Box 163 \ 2 img034 | |
| Cover note for an attached report on wireless interference with the 20/25 tank engine. | 30th Jan 1933 | Box 163 \ 2 img035 | |
| Letter to the Air Ministry attaching a report on ignition screening for a light tank with a 20/25 HP engine. | 31th Jan 1933 | Box 163 \ 2 img036 | |
| Tests for wireless interference on a 20/25 HP engine fitted to a light tank. | 31th Jan 1933 | Box 163 \ 2 img037 | |
| The supply and specification of L.T. ignition filter circuits for tank engines. | 1st Feb 1933 | Box 163 \ 2 img038 | |
| A letter sent to the Director of Army Contracts regarding 20/25 HP tank engines. | 15th Feb 1933 | Box 163 \ 2 img039 | |
| Letter concerning a contractual disagreement over filter units for 20/25 HP tank engines. | 14th Feb 1933 | Box 163 \ 2 img040 | |
| Letter to the Director of Army Contracts regarding a wireless screening system and filter unit for a tank engine. | 14th Feb 1933 | Box 163 \ 2 img041 | |
| Request to arrange the return of two condensers and three chokes loaned for wireless screening tests on a light tank. | 17th Feb 1933 | Box 163 \ 2 img042 | |
| Contractual dispute with the War Office regarding the supply of filter units for 20/25 HP tank engines. | 22th Feb 1933 | Box 163 \ 2 img043 | |
| Dispute with the War Office concerning the filter unit and ignition system for tank engines. | 10th Mar 1933 | Box 163 \ 2 img044 | |
| Ignition screening for 20/25 HP tank engines for the War Office. | 30th Mar 1933 | Box 163 \ 2 img045 | |
| Ignition system screening for a 20/25 Tank Installation. | 30th Mar 1933 | Box 163 \ 2 img046 | |
| Moisture issues with a terminal's insulation, awaiting War Office advice for production and testing of a new sample set. | 30th Mar 1933 | Box 163 \ 2 img047 | |
| Supply and material specifications for a 'Pletit Unit' for wireless screening. | 4th Apr 1933 | Box 163 \ 2 img048 | |
| Letter to the Director of Army Contracts detailing the specifications and suppliers for a Wireless Screening Filter Unit. | 4th Apr 1933 | Box 163 \ 2 img049 | |
| Modifications to 20/25 HP tank engines regarding thermometer plugs and wireless screening. | 5th Apr 1933 | Box 163 \ 2 img050 | |
| War Office letter about altering the screening on 61 tank engines from copper to phosphor bronze wound armouring. | 6th Apr 1933 | Box 163 \ 2 img051 | |
| Letter from the War Office regarding the screening of tank engines, filter units, and a query about a new type of cable for an additional 61 engines. | 4th Apr 1933 | Box 163 \ 2 img052 | |
| Request to assemble a ferrule on a sample plug for further testing of a screened ignition contact. | 19th May 1933 | Box 163 \ 2 img053 | |
| Modifications requested by the War Office for the screening of 20/25 HP Tank Engines. | 26th May 1933 | Box 163 \ 2 img054 | |
| Test report on screened ignition wiring terminals and their performance under water and heat stress. | 7th Jun 1933 | Box 163 \ 2 img055 | |
| Outlining proposed tests for screened ignition plugs for tank engines. | 12th Jun 1933 | Box 163 \ 2 img056 | |
| Lubrication, wireless screening, and dynamo capacity for 20/25 HP tank engines. | 23th Jun 1933 | Box 163 \ 2 img057 | |
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