| Description | Date | Identifier | |
| List of customer cars showing excessive toe-in, with owner details, vehicle specifications, and mileage. | 9th Jul 1930 | Box 65 \ 2 scan0327 | |
| Recommendations for Phantom II tyre pressures for normal use with a warning for high-speed touring. | 9th Jul 1930 | Box 65 \ 2 scan0328 | |
| The encouraging test results of a new experimental Dunlop silent tread tyre. | 8th Aug 1930 | Box 65 \ 2 scan0329 | |
| Query regarding the standardisation of a new silent Dunlop tyre with improved road adhesive qualities. | 17th Sep 1930 | Box 65 \ 2 scan0330 | |
| Communication regarding gaining more experience with a set of tyres, specifically wear, before standardising them. | 22th Sep 1930 | Box 65 \ 2 scan0331 | |
| Urgency of getting experience with new tyres due to complaints about the adhesive properties of 'Silent tyres'. | 26th Sep 1930 | Box 65 \ 2 scan0332 | |
| The wear and tear of experimental silent type tyres after 4,700 miles of use. | 4th Oct 1930 | Box 65 \ 2 scan0333 | |
| Letter to the Dunlop Rubber Co. Ltd. confirming the 'Silent Tread Tyre' will be the standard equipment for cars in the immediate future. | 7th Oct 1930 | Box 65 \ 2 scan0334 | |
| The testing of modified Dunlop Silent Tread Tyres for road adhesion and noise characteristics. | 7th Oct 1930 | Box 65 \ 2 scan0335 | |
| Tyre modification, road adhesion testing, and a proposal for their standardisation. | 7th Oct 1930 | Box 65 \ 2 scan0336 | |
| Returned and signed standardisation sheet regarding a modification to the tread pattern on tyres and an enquiry about availability. | 9th Oct 1930 | Box 65 \ 2 scan0337 | |
| Standardisation document for a modification to the tyre tread pattern to improve grip. | 7th Oct 1930 | Box 65 \ 2 scan0338 | |
| Use of non-Fort tyres on the 20' wheels of the Phantom II due to steering issues. | 24th Nov 1930 | Box 65 \ 2 scan0339 | |
| Comparing Dunlop and India tyres for 40/50 & 20 HP cars. | 5th Feb 1931 | Box 65 \ 2 scan0340 | |
| Suggesting a review of recommended tyre pressures for improved comfort, comparing instruction book figures with lower, personally used pressures. | 1st Jun 1932 | Box 65 \ 2 scan0341 | |
| Suitability and comparison of Lucas, Watford, and Robert Bosch magnetos for various engine models. | 1st Nov 1926 | Box 65 \ 3 scan0001 | |
| Acquisition of magnetos from Messrs. Norths for examination and testing. | 11th Nov 1926 | Box 65 \ 3 scan0002 | |
| Design and advance mechanisms of Watford and Lucas magnetos. | 11th Nov 1926 | Box 65 \ 3 scan0003 | |
| Outlining proposed design changes for the Phantom and 20 HP Magnetos. | 10th Dec 1926 | Box 65 \ 3 scan0004 | |
| Chasing the delivery of sleeveless magneto samples from Watford for the 20 HP and 40/50 models. | 1st Jan 1927 | Box 65 \ 3 scan0005 | |
| Magnetos for 40/50 and 20 HP models, comparing Watford Co. with Lucas. | 27th Jan 1927 | Box 65 \ 3 scan0006 | |
| Requesting an update on the progress and latest design of the Watford sleeveless magneto. | 31th Jan 1927 | Box 65 \ 3 scan0007 | |
| Supplier's response regarding the design and materials for a Watford sleeveless magneto. | 9th Feb 1927 | Box 65 \ 3 scan0008 | |
| The supply and design of sleeveless magnetos and clocks from Messrs Norths. | 22th Feb 1927 | Box 65 \ 3 scan0009 | |
| Selection criteria for magnetos on a 20 HP non-sleeve type engine. | 26th Feb 1927 | Box 65 \ 3 scan0010 | |
| The suitability of a sleeve-type magneto for the 20 HP chassis, comparing its performance with other ignition systems. | 3rd Mar 1927 | Box 65 \ 3 scan0011 | |
| Comparison of magneto performance, contrasting sleeve-type and rotating armature machines for engine ignition systems. | 3rd Mar 1927 | Box 65 \ 3 scan0012 | |
| Sleeve position changes on engine R.O.1, its effect on noise, and an opinion on magneto suppliers. | 4th Mar 1927 | Box 65 \ 3 scan0013 | |
| Cover letter accompanying a diagram for the Watford Sleeveless Magneto for the 40/50 HP chassis. | 4th Mar 1927 | Box 65 \ 3 scan0014 | |
| Rattling fault in the Watford Sleeve Magneto Type EC6 and experiments with alternatives. | 14th Mar 1927 | Box 65 \ 3 scan0015 | |
| Sourcing and specifications of magnetos for Phantom and other HP models. | 5th Apr 1927 | Box 65 \ 3 scan0016 | |
| Letter discussing magneto requirements and specifications for Phantom and 20 HP car models. | 26th Apr 1927 | Box 65 \ 3 scan0017 | |
| Page 2 of a letter signed by F.H. Royce, requesting new prices and adding a note about a magneto. | 26th May 1927 | Box 65 \ 3 scan0018 | |
| Form recording the design and performance details of a magneto on test. | 26th May 1927 | Box 65 \ 3 scan0019 | |
| Specification sheet for contact breaker timing and automatic advance characteristics. | 26th May 1927 | Box 65 \ 3 scan0020 | |
| Table of distributor dimensions with relative and absolute values, noting that segment length figures are an average. | 26th May 1927 | Box 65 \ 3 scan0021 | |
| Test report on endurance, circuit tests, and volt-speed curve performance. | 26th May 1927 | Box 65 \ 3 scan0022 | |
| Test results showing a closed circuit primary ampere-speed curve and sparking characteristics. | 26th May 1927 | Box 65 \ 3 scan0023 | |
| Test results for contact breaker timing and primary point gap settings. | 26th May 1927 | Box 65 \ 3 scan0024 | |
| Test report observations on machine silence and tangential force on a cam lever. | 26th May 1927 | Box 65 \ 3 scan0025 | |
| Preliminary report on a new sleeveless Watford magneto, model No 98201. | 26th May 1927 | Box 65 \ 3 scan0026 | |
| Instructions outlining design improvements and further testing required for a magneto. | 31th May 1927 | Box 65 \ 3 scan0027 | |
| Instruction sheet detailing the failure of a Watford sleeveless magneto during electrical tests. | 31th May 1927 | Box 65 \ 3 scan0028 | |
| Instruction sheet discussing magneto testing and the selection of a suitable chassis for further tests. | 8th Dec 1924 | Box 65 \ 3 scan0029 | |
| Letter detailing the bench test results and specification failures of a new sleeveless type magneto from North & Sons, Ltd. | 10th Jun 1927 | Box 65 \ 3 scan0030 | |
| The concluding page of a typed letter. | 10th Jun 1927 | Box 65 \ 3 scan0031 | |
| The trial of a Sleeveless Watford Magneto and a Lucas type ER6 magneto on a test chassis. | 10th Jun 1927 | Box 65 \ 3 scan0032 | |
| The inspection and testing of new sleeveless Watford and up-to-date Lucas ER6 magnetos. | 13th Jun 1927 | Box 65 \ 3 scan0033 | |
| Comparison and examination of modifications and specifications for Lucas and Watford magnetos. | 13th Jun 1927 | Box 65 \ 3 scan0034 | |
| Comparison of distributor specifications for Watford and Lucas models, detailing ranges, timing, and dimensions. | 13th Jun 1927 | Box 65 \ 3 scan0035 | |
| Comparative table of relative distributor dimensions for Watford and Lucas models. | 13th Jun 1927 | Box 65 \ 3 scan0036 | |
| Endurance, short circuit, and open circuit tests comparing Watford and Lucas magnetos. | 13th Jun 1927 | Box 65 \ 3 scan0037 | |
| Comparative performance analysis of Lucas and Watford magnetos, including open/short circuit and utility spark gap tests. | 13th Jun 1927 | Box 65 \ 3 scan0038 | |
| Performance comparison test report on Watford and Lucas magnetos. | 13th Jun 1927 | Box 65 \ 3 scan0039 | |
| Continued report comparing performance characteristics and specifications of Watford and Lucas magnetos. | 13th Jun 1927 | Box 65 \ 3 scan0040 | |
| Comparison between the Watford sleeveless type magneto and the Lucas type ER6 magneto. | 13th Jun 1927 | Box 65 \ 3 scan0041 | |
| Comparative testing of magnetos from different makers. | 11th Jun 1927 | Box 65 \ 3 scan0042 | |
| Graph of open circuit volt-speed and short circuit ampere-speed curves for Watford and Lucas magnetos. | 11th Jun 1927 | Box 65 \ 3 scan0043 | |
| Test report on a Sleeveless Watford Magneto, detailing various faults including noise, squeaks, and incorrect assembly. | 16th Jun 1927 | Box 65 \ 3 scan0044 | |
| Fitting of a new Watford sleeveless magneto to chassis 10-EX and the return of the old one. | 7th Jun 1927 | Box 65 \ 3 scan0045 | |
| Sending a Bosch ignition head and Lucas magneto, and requesting new models from Lucas and Watford. | 18th Jun 1927 | Box 65 \ 3 scan0046 | |
| Letter to Messrs. North & Sons, Ltd. about the test results of a sleeveless magneto. | 20th Jun 1927 | Box 65 \ 3 scan0047 | |
| Note detailing the fitting of a Watford Sleeveless Magneto to chassis 10.EX. | 21th Jun 1927 | Box 65 \ 3 scan0048 | |
| Letter from North & Sons, Ltd. concerning modifications to a sleeveless magneto due to noise issues. | 23th Jun 1927 | Box 65 \ 3 scan0049 | |
| Chasing a report on comparison tests between Lucas and Watford magnetos. | 24th Jun 1927 | Box 65 \ 3 scan0050 | |
| The availability of Watford Sleeveless and Lucas magnetos for inspection. | 29th Jun 1927 | Box 65 \ 3 scan0051 | |
| Letter to Messrs. North & Sons, Ltd. concerning a sleeveless magneto and modifications requested by Mr. Royce. | 29th Jun 1927 | Box 65 \ 3 scan0052 | |
| Performance characteristic graph for a Watford 55% Armature, plotting degrees retard against RPM. | 29th Dec 1926 | Box 65 \ 3 scan0053 | |
| Confirming a change from ball distributor bearings to plain distributor bearings for Watford sleeveless magnetos. | 5th Jul 1927 | Box 65 \ 3 scan0054 | |
| Letter from North & Sons, Ltd. confirming a visit to present a new sample magneto for approval. | 8th Aug 1927 | Box 65 \ 3 scan0055 | |
| The swapping of a Lucas and a Watford magneto between cars 9-EX and 10-EX. | 9th Aug 1927 | Box 65 \ 3 scan0056 | |
| Visit from Mr. North discussing the selection and issues concerning magnetos for cars and aero engines. | 19th Aug 1927 | Box 65 \ 3 scan0057 | |
| Sourcing of Swiss aero engine magnetos to benchmark against and stimulate development of English models. | 23th Aug 1927 | Box 65 \ 3 scan0058 | |
| Modifications and performance comparisons of chassis magnetos. | 23th Aug 1927 | Box 65 \ 3 scan0059 | |
| Letter from North & Sons, Ltd. regarding magneto test results and delivery. | 23th Aug 1927 | Box 65 \ 3 scan0060 | |
| Form recording the design and performance details of a magneto on test. | 23th Aug 1927 | Box 65 \ 3 scan0061 | |
| Specification sheet for primary point gap, contact breaker timing, and automatic advance characteristics. | 23th Aug 1927 | Box 65 \ 3 scan0062 | |
| Table detailing distributor dimensions in both relative and absolute (inches) values. | 23th Aug 1927 | Box 65 \ 3 scan0063 | |
| Test results for endurance, short circuit, open circuit, and an open circuit primary volt-speed curve. | 23th Aug 1927 | Box 65 \ 3 scan0064 | |
| Test report continuation page detailing closed circuit primary ampere-speed curve, speed range, and sparking characteristics. | 23th Aug 1927 | Box 65 \ 3 scan0065 | |
| Test results and data for contact breaker timing and primary point gap settings. | 23th Aug 1927 | Box 65 \ 3 scan0066 | |
| Notes on magneto operation noise, identifying the 'make and break' as the noisiest component, and a tangential force measurement. | 27th Aug 1927 | Box 65 \ 3 scan0067 | |
| Refusal to use Lucas magnetos due to their poor reputation and considering other supplier brands. | 27th Aug 1927 | Box 65 \ 3 scan0068 | |
| New sleeveless magneto from the Watford Magneto Company, comparing costs and testing. | 29th Aug 1927 | Box 65 \ 3 scan0069 | |
| Performance of new Watford chassis magnetos and comparing them with competitors M.L. and B.T.H. | 29th Aug 1927 | Box 65 \ 3 scan0070 | |
| Comparison and testing of various magnetos including Watford, Lucas, Robert Bosch, and Scintilla. | 29th Aug 1927 | Box 65 \ 3 scan0071 | |
| Test report on the performance of a Watford EW6 magneto, comparing it to a Lucas model. | 30th Aug 1927 | Box 65 \ 3 scan0072 | |
| The exceptional performance and reliability of two magnetos following testing. | 8th Dec 1924 | Box 65 \ 3 scan0073 | |
| The replacement of Watford magnetos on chassis 12-EX and 9-EX. | 30th Aug 1927 | Box 65 \ 3 scan0074 | |
| Form recording the design and performance details of a magneto on test. | 3rd Sep 1927 | Box 65 \ 3 scan0075 | |
| Specifications for primary point gap, contact breaker timing, and automatic advance characteristics. | 3rd Sep 1927 | Box 65 \ 3 scan0076 | |
| Table of distributor dimensions listing relative and absolute values in inches. | 3rd Sep 1927 | Box 65 \ 3 scan0077 | |
| Test results for endurance, short circuit, open circuit, and an open circuit primary volt-speed curve. | 3rd Sep 1927 | Box 65 \ 3 scan0078 | |
| Test results for a closed circuit primary ampere-speed curve, speed range and sparking characteristics. | 3rd Sep 1927 | Box 65 \ 3 scan0079 | |
| Test results for secondary milliamps, primary point gap, and contact breaker timing. | 3rd Sep 1927 | Box 65 \ 3 scan0080 | |
| Notes on magneto operation silence and tangential force measurements. | 5th Sep 1927 | Box 65 \ 3 scan0081 | |
| Pricing for magnetos and pricing/design considerations for dashboard clocks and instruments. | 5th Sep 1927 | Box 65 \ 3 scan0082 | |
| Requesting a trial of a Watford sleeveless magneto on test cars for potential cost reduction. | 6th Sep 1927 | Box 65 \ 3 scan0083 | |
| The testing of new 'Watford' magnetos as a potential cost-saving replacement for the current standard model. | 6th Sep 1927 | Box 65 \ 3 scan0084 | |
| The electrical bench testing of non-sleeve type Watford magnetos. | 6th Sep 1927 | Box 65 \ 3 scan0085 | |
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