| Description | Date | Identifier | |
| Proposal for experiments on armatures with various slot sizes to ascertain the effect of earlier saturation. | 10th Jul 1931 | Box 61b \ 1 scan0229 | |
| Requesting the construction of two Dynamo Armatures with specific winding and slot dimensions. | 16th Jul 1931 | Box 61b \ 1 scan0230 | |
| Urging the completion of work on three dynamo armatures for testing. | 8th Aug 1931 | Box 61b \ 1 scan0231 | |
| Results of three different armature designs for dynamos to test saturation of the armature teeth. | 28th Aug 1931 | Box 61b \ 1 scan0232 | |
| Investigation results for different armatures and a note on upcoming tests for series winding. | 28th Aug 1931 | Box 61b \ 1 scan0233 | |
| Graph of dynamo output curves showing the effect of increasing armature slot size. | 1st Dec 1930 | Box 61b \ 1 scan0234 | |
| Tests conducted on a dynamo's auxiliary field winding. | 2nd Sep 1931 | Box 61b \ 1 scan0235 | |
| Modifying series windings to improve electrical output for headlamps and charging rates. | 2nd Sep 1931 | Box 61b \ 1 scan0236 | |
| Graph of output speed curves showing the effect of series winding excited by headlamp current. | 1st Sep 1931 | Box 61b \ 1 scan0237 | |
| Graph of dynamo output speed curves for a PII chassis, showing the effect of series winding excited by headlamp current. | 2nd Sep 1931 | Box 61b \ 1 scan0238 | |
| Assembly instruction for the Distributor control rod pin on a 20 HP Chassis. | 7th Jul 1924 | Box 61b \ 2 scan0001 | |
| Amendments to the production test for the EAC distributor. | 17th Jan 1925 | Box 61b \ 2 scan0002 | |
| Requesting an experiment to modify a standard battery ignition distributor head with ventilation holes for testing. | 15th Apr 1925 | Box 61b \ 2 scan0003 | |
| From EFC to RHC requesting six holes be drilled in an EAC distributor head for an experiment. | 23th Apr 1925 | Box 61b \ 2 scan0004 | |
| Production inspection, adjustment, and testing procedure for an ignition distributor and contact breaker. | 15th May 1925 | Box 61b \ 2 scan0005 | |
| Instructions for testing and adjusting a distributor, including platinum gap, spring tension, and high tension rotor. | 28th Jan 1925 | Box 61b \ 2 scan0006 | |
| Instructions for examining the H.T. rotor and checking clearances after a governor test. | 28th Jan 1925 | Box 61b \ 2 scan0007 | |
| Specification for the tangential force required to advance or retard the ignition distributor. | 15th May 1925 | Box 61b \ 2 scan0008 | |
| From EFC to RHC regarding the modification of an EAC distributor's contact breaker. | 15th May 1925 | Box 61b \ 2 scan0009 | |
| Request to obtain an up-to-date EAC contact breaker and distributor with a new earthing connection for experimental purposes. | 20th May 1925 | Box 61b \ 2 scan0010 | |
| 10,000-mile test of a ventilated distributor head and standard platinum points. | 12th Jun 1925 | Box 61b \ 2 scan0011 | |
| Test report on the condition of components, noting issues with plated ports and a high tension feeder. | 29th Jun 1920 | Box 61b \ 2 scan0012 | |
| Corrosion on EAC battery ignition distributor mouldings, including Mr. Royce's suggestions for a solution. | 18th Aug 1925 | Box 61b \ 2 scan0013 | |
| Request to drill additional holes in the ventilating distributor head on a second chassis for an experiment. | 8th Jul 1925 | Box 61b \ 2 scan0014 | |
| 10,000 mile bench test of a standard contact breaker and distributor. | 22th Jul 1925 | Box 61b \ 2 scan0015 | |
| 10,000-mile test of a standard distributor and platinum points, including the effects of ventilation on corrosion. | 4th Sep 1925 | Box 61b \ 2 scan0016 | |
| Suitability of different metals for H.T. distributors and comparing insulation with Bosch products. | 15th Sep 1925 | Box 61b \ 2 scan0017 | |
| Experiments on materials for H.T. distributor sparking points. | 22th Sep 1925 | Box 61b \ 2 scan0018 | |
| Ignition system failures, ventilation issues, and experiments on distributor components. | 22th Sep 1925 | Box 61b \ 2 scan0019 | |
| Request for a statement on distributor features fitted to chassis 8-EX. | 23th Sep 1925 | Box 61b \ 2 scan0020 | |
| Proposal for modifications to the battery ignition system to exclude crankchamber gas. | 11th Jan 1926 | Box 61b \ 2 scan0021 | |
| Issues with bad platinum contact points and considerations for standardization. | 11th Jan 1926 | Box 61b \ 2 scan0022 | |
| Ventilation of the distributor for the 20 HP chassis. | 14th Jan 1926 | Box 61b \ 2 scan0023 | |
| Standardising the ventilation of the 20 HP distributor, referencing the New Phantom. | 15th Jan 1926 | Box 61b \ 2 scan0024 | |
| Standardisation and running of tungsten contact points on a distributor for model 10-GIII. | 15th Jan 1926 | Box 61b \ 2 scan0025 | |
| Standardisation of distributor ventilation on the 20 HP chassis to align with the New Phantom. | 15th Jan 1926 | Box 61b \ 2 scan0026 | |
| Instructions regarding a distributor head with the omission of steel spring washers under the sparking points. | 2nd Feb 1926 | Box 61b \ 2 scan0027 | |
| 10,000-mile bench test of an up-to-date standard ignition distributor with an extra ventilation scheme. | 2nd Feb 1926 | Box 61b \ 2 scan0028 | |
| Instruction sheet with handwritten notes comparing corrosion levels from ventilation tests. | 29th Jun 1920 | Box 61b \ 2 scan0029 | |
| Instruction sheet detailing the observed tangential force needed to move a distributor and suggesting production limits. | 18th Feb 1925 | Box 61b \ 2 scan0030 | |
| Test report on a distributor rotor with reduced insulation thickness to find its breakdown voltage. | 2nd Mar 1926 | Box 61b \ 2 scan0031 | |
| The battery ignition of chassis 10-GIII after 2948 miles. | 12th Apr 1926 | Box 61b \ 2 scan0032 | |
| Explanation of the chemical process causing corrosion on exposed metal parts in jump spark ignition distributors. | 20th May 1926 | Box 61b \ 2 scan0033 | |
| 10,000-mile test of an A.H.Y. distributor fitted with stainless steel components. | 27th May 1926 | Box 61b \ 2 scan0034 | |
| Short memo confirming the commercial availability of stainless steel sheet for rotor blades. | 29th Jun 1926 | Box 61b \ 2 scan0035 | |
| Noisy ignition distributor (No.1712) due to a manufacturing error, and a request for improved accuracy. | 1st Jul 1926 | Box 61b \ 2 scan0036 | |
| Standardisation of the H.T. Distributor Rotor, using a stainless steel blade and points to minimise corrosion and burning. | 22th Jun 1926 | Box 61b \ 2 scan0037 | |
| A.H.T. distributor with stainless steel components tested over 10,000 miles. | 27th May 1926 | Box 61b \ 2 scan0038 | |
| Identifying the cause of trouble with a Distributor and Rocker Lever as a dimensional issue from press tools. | 29th Jun 1926 | Box 61b \ 2 scan0039 | |
| Acceptable tolerance error for a rocker block in Distributor No.1712. | 19th Jul 1926 | Box 61b \ 2 scan0040 | |
| The return of a noisy distributor deemed unsuitable for production. | 19th Jul 1926 | Box 61b \ 2 scan0041 | |
| List of three suggested improvements to the distributor with reasons for each change. | 17th Sep 1926 | Box 61b \ 2 scan0042 | |
| Production inspection, adjustment, and test procedures for the ignition distributor and contact breaker. | 15th Oct 1926 | Box 61b \ 2 scan0043 | |
| Test procedure for setting up a contact breaker and distributor, including current, gap, and tension specifications. | 15th Oct 1926 | Box 61b \ 2 scan0044 | |
| Testing procedures for a distributor high tension rotor, including insulation and clearance checks. | 15th Oct 1926 | Box 61b \ 2 scan0045 | |
| Mechanical test procedure for a 20 HP governor, detailing advance-speed characteristic limits. | 15th Oct 1926 | Box 61b \ 2 scan0046 | |
| Instructions on altering the set of a spring to comply with speed limits. | 7th Jan 1927 | Box 61b \ 2 scan0047 | |
| Suggestion to add extra ventilation to the distributor on 20HP chassis during the fitting of an improved side steering tube. | 7th Jan 1927 | Box 61b \ 2 scan0048 | |
| Instruction to test a spherical versus flat point on the adjustable contact screw for 20 HP and 40/50 HP ignition distributors. | 22th Oct 1926 | Box 61b \ 2 scan0049 | |
| Requesting an experimental laboratory run for a modified distributor head and rotor. | 13th Nov 1926 | Box 61b \ 2 scan0050 | |
| Agreeing to the modified position of ventilation holes for a 20 HP distributor. | 8th Jan 1927 | Box 61b \ 2 scan0051 | |
| Requirements and considerations for 20HP engine magnetos. | 26th Feb 1927 | Box 61b \ 2 scan0052 | |
| Development and testing of a new, peakier distributor cam. | 21th Mar 1927 | Box 61b \ 2 scan0053 | |
| Requesting a test on a distributor cam to see if it allows more time for the points to cool. | 25th Mar 1927 | Box 61b \ 2 scan0054 | |
| Graph of make ratio versus speed curves for a standard contact breaker, comparing standard and stronger springs at various gap settings. | 31th Mar 1927 | Box 61b \ 2 scan0055 | |
| Proposal to modify the ignition distributor's contact finger spring by black enameling it to prevent breakage from nickel depositing. | 2nd Apr 1927 | Box 61b \ 2 scan0056 | |
| Complaints about the distributor's earth contact spring being too strong and suggesting a more flexible replacement. | 7th Apr 1927 | Box 61b \ 2 scan0057 | |
| Acquisition of three springs for ignition distributor contact breaker experiments. | 12th Apr 1927 | Box 61b \ 2 scan0058 | |
| Requesting the fitting of special condenser springs to three specific chassis. | 12th Apr 1927 | Box 61b \ 2 scan0059 | |
| Request to trial stainless steel pivot pins for the ignition distributor to prevent seizing from rust. | 27th Apr 1927 | Box 61b \ 2 scan0060 | |
| Request for three sets of parts for a semi-rigid mounting on an ignition distributor for experimental testing. | 25th May 1927 | Box 61b \ 2 scan0061 | |
| Fitting stainless steel pivot pins to experimental ignition distributors. | 10th Jun 1927 | Box 61b \ 2 scan0062 | |
| Parts list and instructions for testing distributor contact points with a scrubbing action. | 17th Jun 1927 | Box 61b \ 2 scan0063 | |
| Providing an updated production inspection, adjustment, and test specification for the ignition distributor and contact breaker. | 7th Jul 1927 | Box 61b \ 2 scan0064 | |
| Production inspection, adjustment, and test procedures for the ignition distributor and contact breaker. | 7th Jul 1927 | Box 61b \ 2 scan0065 | |
| Testing procedure for a contact breaker and distributor involving electrical and mechanical measurements. | 7th Jul 1927 | Box 61b \ 2 scan0066 | |
| Testing instructions for a distributor high tension rotor, including voltage and clearance checks. | 7th Jul 1927 | Box 61b \ 2 scan0067 | |
| Mechanical test procedure for a 20 HP governor, including performance limits. | 7th Jul 1927 | Box 61b \ 2 scan0068 | |
| Instructions on adjusting the spring set of the weights if speed limits for the advance are not met. | 22th Jul 1927 | Box 61b \ 2 scan0069 | |
| Parts modifications for Distributor Schemes 259 and 260. | 22th Jul 1927 | Box 61b \ 2 scan0070 | |
| Alterations to an ignition distributor's insulated contact finger. | 22th Aug 1927 | Box 61b \ 2 scan0071 | |
| Instructions for modifying an umbrella-type ignition distributor rotor. | 19th Sep 1927 | Box 61b \ 2 scan0072 | |
| Test report on a new experimental mushroom type H.T. rotor, comparing its performance against the standard type. | 22th Oct 1927 | Box 61b \ 2 scan0073 | |
| Distributor head sparking issues, corrosion, and a proposal to redesign the rotor with vanes to improve air impelling. | 22th Oct 1927 | Box 61b \ 2 scan0074 | |
| Distributor tracking, proposing tests on the mushroom rotor, and repositioning the safety gap. | 19th Dec 1927 | Box 61b \ 2 scan0075 | |
| Testing of a distributor for the Sports Phantom Chassis due to concerns about a spring's quality. | 9th Jan 1928 | Box 61b \ 2 scan0076 | |
| Cancelling instructions for fitting a mushroom rotor to chassis 15-EX and reverting to fitting it to chassis 12-EX. | 27th Jan 1928 | Box 61b \ 2 scan0077 | |
| Requesting a modified .064' gauge screw point support for a Battery Ignition Distributor following testing. | 2nd Feb 1928 | Box 61b \ 2 scan0078 | |
| Production inspection, adjustment, and test procedures for an ignition distributor and contact breaker. | 9th Feb 1928 | Box 61b \ 2 scan0079 | |
| Test procedures for an ignition distributor, detailing electrical and mechanical checks. | 9th Feb 1928 | Box 61b \ 2 scan0080 | |
| Testing procedures and specifications for a distributor high-tension rotor. | 3rd Mar 1928 | Box 61b \ 2 scan0081 | |
| Fitting a 'Marconite' varnished 40/50 distributor head to car 8-EX and returning the original. | 3rd Mar 1928 | Box 61b \ 2 scan0082 | |
| Experimental features of a distributor unit to be fitted to engine 9-G3. | 19th Mar 1928 | Box 61b \ 2 scan0083 | |
| Fitting a new 'Armacell' varnished distributor head to car 12-EX. | 29th Mar 1928 | Box 61b \ 2 scan0084 | |
| Cover memo for an assistant's report regarding varnished battery ignition distributor moulded heads. | 30th Mar 1928 | Box 61b \ 2 scan0085 | |
| Experiment testing various varnishes on battery ignition distributor heads to prevent surface tracking. | 27th Mar 1928 | Box 61b \ 2 scan0086 | |
| Request to modify a mushroom-type H.T. distributor rotor by filling an old key-way and cutting a new one. | 2nd May 1928 | Box 61b \ 2 scan0087 | |
| Failures of ignition distributor rotors and the testing of a new mushroom type design. | 2nd May 1928 | Box 61b \ 2 scan0088 | |
| Standardisation of a battery ignition bakelite distributor rotor of the mushroom type. | 12th May 1928 | Box 61b \ 2 scan0089 | |
| Chassis number, test date, and costs for fitting a new part on the 40/50 HP and 20 HP models. | 6th Jun 1928 | Box 61b \ 2 scan0090 | |
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