| Description | Date | Identifier | |
| Need to differentiate between 20 HP and 40/50 HP chassis for customer complaints. | 8th Mar 1928 | Box 57 \ 2 Scan117 | |
| 20 HP dynamo armature for chassis GCK.76, considering modifications to meet customer requirements for higher output. | 8th Mar 1928 | Box 57 \ 2 Scan118 | |
| Complaint of a dynamo failing to charge on chassis GRJ-41 for H. Broadmead Esq. | 8th Mar 1928 | Box 57 \ 2 Scan119 | |
| The procedure for prefixing chassis numbers with their horsepower rating for clarity. | 9th Mar 1928 | Box 57 \ 2 Scan120 | |
| The modification and fitting of a 20 HP dynamo to a customer's chassis. | 19th Apr 1928 | Box 57 \ 2 Scan121 | |
| Sending a modified 20 HP dynamo to the Stores department for fitment to a customer's chassis. | 20th Apr 1928 | Box 57 \ 2 Scan122 | |
| Customer complaint regarding a noisy 20 HP dynamo on chassis GAJ-73 for W.C. Thorne Esq. | 1st May 1928 | Box 57 \ 2 Scan123 | |
| Noisy dynamo from chassis GAJ-73, diagnosing the cause as a bearing that ran dry due to lack of oil. | 4th May 1928 | Box 57 \ 2 Scan124 | |
| Faulty dynamo (1696) requiring commutator truing due to a cutout failure. | 17th May 1928 | Box 57 \ 2 Scan125 | |
| Faulty 20 HP Dynamo from chassis GZK-59, requesting an examination and advice on where to charge the repair costs. | 17th May 1928 | Box 57 \ 2 Scan126 | |
| Dynamo charging fault and a request for replacement parts. | 21th Mar 1948 | Box 57 \ 2 Scan127 | |
| Recurring dynamo fault on chassis GZK-59 and the plan for its repair. | 2nd Apr 1928 | Box 57 \ 2 Scan128 | |
| Returned dynamo from chassis 103-DC, suggesting the issue is a customer's overcharged battery. | 17th May 1928 | Box 57 \ 2 Scan129 | |
| Letter from an Austrian firm about dynamo alterations on a 20 hp chassis. | 28th Aug 1928 | Box 57 \ 2 Scan130 | |
| Translated letter from an Austrian engineer detailing modifications to a dynamo to prevent sparking. | 17th Aug 1928 | Box 57 \ 2 Scan131 | |
| Response to a customer complaint about a repeated blowing field fuse, providing troubleshooting steps for the dynamo charging circuit. | 1st Jul 1931 | Box 57 \ 2 Scan132 | |
| Dynamo charging systems, battery life, and charging rates for customers. | 1st Jul 1931 | Box 57 \ 2 Scan133 | |
| Issues with a car's electrical system, springing, and a proposed modification to the propeller shaft lubricator. | 10th Jul 1931 | Box 57 \ 2 Scan134 | |
| Request for details about a rectified electrical fault on a customer's car to prevent future repetition of the trouble. | 27th Jul 1931 | Box 57 \ 2 Scan135 | |
| Electrician's report regarding the cause of a blowing dynamo field fuse on chassis GXO-46. | 28th Jul 1931 | Box 57 \ 2 Scan136 | |
| Complaint regarding the failure of a dynamo to charge correctly for chassis G3R-53. | 29th Oct 1931 | Box 57 \ 2 Scan137 | |
| Dismantled dynamo from Mrs. Cadbury's chassis GPS.1, which failed due to an unauthorized adjustment to increase its output. | 10th Nov 1931 | Box 57 \ 2 Scan138 | |
| The lack of recent failure records for Watford ROL magnetos and requesting updated information. | 6th May 1927 | Box 57 \ 2 Scan139 | |
| Performance and reliability of R.O.1 Magnetos. | 6th May 1927 | Box 57 \ 2 Scan140 | |
| Customer complaint on the new car GDP-69 belonging to E.R. Corn Esq. | 13th Aug 1930 | Box 57 \ 2 Scan141 | |
| Customer complaint letter about faults with brakes, steering, and a cigar lighter that caused a fire risk in a new car. | 6th Aug 1930 | Box 57 \ 2 Scan142 | |
| Incorrect wiring of a cigar lighter accessory on chassis GDP-69. | 14th Aug 1930 | Box 57 \ 2 Scan143 | |
| File note cross-referencing previous correspondence concerning the Watford R.O.1. Magneto. | 4th May 1926 | Box 57 \ 2 Scan144 | |
| Chassis 10-GIII after 10,027 miles, detailing the condition of the Magneto, Drive and Dynamo. | 4th May 1926 | Box 57 \ 2 Scan145 | |
| Forwarding an assistant's report on a fault with the Magneto H.T. wire on a 20 HP chassis. | 22th Sep 1926 | Box 57 \ 2 Scan146 | |
| The deterioration of the magneto H.T. wire on a 20 HP chassis due to an oil leak and a proposed solution. | 15th Sep 1926 | Box 57 \ 2 Scan147 | |
| Testing of a Watford RO1 Magneto and enclosing the related report WB.116. | 7th Dec 1926 | Box 57 \ 2 Scan148 | |
| Test report on a Watford RO1 Magneto No. 94311 fitted with long cams. | 3rd Dec 1926 | Box 57 \ 2 Scan149 | |
| Approving magnetos fitted with long cams for production use on chassis. | 8th Dec 1926 | Box 57 \ 2 Scan150 | |
| The features of a new, more silent magneto for the Phantom and 20 HP models. | 10th Dec 1926 | Box 57 \ 2 Scan151 | |
| Cover letter for the production inspection and test specification for the Watford R01 Magneto. | 1st Dec 1926 | Box 57 \ 2 Scan152 | |
| Production inspection and test specification for a Watford Type R.O.1 Magneto (Long Cam Type). | 20th Dec 1926 | Box 57 \ 2 Scan153 | |
| Page of testing procedures for a magneto, detailing checks on the contact breaker, running speeds, and spark gap performance. | 20th Dec 1926 | Box 57 \ 2 Scan154 | |
| Specifications for minimum sparking speeds of a magneto at various ignition timing positions. | 20th Dec 1926 | Box 57 \ 2 Scan155 | |
| Internal memorandum regarding an agreement to supply Watford RO.1 magnetos with longer cams. | 20th Dec 1926 | Box 57 \ 2 Scan156 | |
| Form recording the design and performance details of a magneto on test. | 23th Dec 1926 | Box 57 \ 2 Scan157 | |
| Specifications for sleeve and contact breaker timing for a magneto. | 23th Dec 1926 | Box 57 \ 2 Scan158 | |
| Test report page detailing results for endurance, circuit, and open circuit primary volt-speed curve tests. | 23th Dec 1926 | Box 57 \ 2 Scan159 | |
| Page 4 of a test report detailing a closed circuit primary ampere-speed curve and sparking characteristics. | 23th Dec 1926 | Box 57 \ 2 Scan160 | |
| Test results page detailing secondary milliamps, primary point gaps, and contact breaker timing. | 23th Dec 1926 | Box 57 \ 2 Scan161 | |
| Remarks on operational silence and the tangential force required to advance the cam lever. | 30th Dec 1926 | Box 57 \ 2 Scan162 | |
| Burning of distributor points on a 20 HP engine when using an R.O.1 magneto. | 30th Dec 1926 | Box 57 \ 2 Scan163 | |
| Technical query regarding the ignition battery and magneto contact breaker block, including a sketch and discussion of angles. | 12th Feb 1927 | Box 57 \ 2 Scan164 | |
| Response to a query regarding electrical troubles with magneto and battery ignition points. | 4th Feb 1927 | Box 57 \ 2 Scan165 | |
| Report page concerning high tension distributor points and dynamo brushes for 20 HP engines, attached to a blank inspection certificate form. | 19th Feb 1920 | Box 57 \ 2 Scan166 | |
| The delivery and fitting of sleeveless magnetos and clocks for different chassis models. | 22th Feb 1927 | Box 57 \ 2 Scan167 | |
| Outlining the requirements and queries regarding magnetos for a 20 HP non-sleeve type engine. | 26th Feb 1927 | Box 57 \ 2 Scan168 | |
| Suitability of a sleeve type magneto for the 20 HP chassis. | 8th Mar 1927 | Box 57 \ 2 Scan169 | |
| Report comparing the performance of sleeve-type magnetos against rotating armature machines for various engine models. | 8th Mar 1927 | Box 57 \ 2 Scan170 | |
| Altering sleeve position in relation to engine noise, the R.O.1 magneto, and an opinion on various magneto suppliers. | 2nd Mar 1927 | Box 57 \ 2 Scan171 | |
| Extract of a communication regarding the 20 HP magneto, starting improvements, and testing of experimental parts. | 2nd Mar 1927 | Box 57 \ 2 Scan172 | |
| Potential improvements and testing procedures for a battery ignition system. | 12th Mar 1927 | Box 57 \ 2 Scan173 | |
| Request to return a faulty Watford magneto for repair due to the development of excessive end play. | 16th Mar 1927 | Box 57 \ 2 Scan174 | |
| Modification of Watford magnetos for timing tests, specifically regarding the interchangeability of EO6 and RO1 sleeves. | 28th Mar 1927 | Box 57 \ 2 Scan175 | |
| Quote from North & Sons Ltd. for overhauling a misfiring Watford RO.1 Magneto with a broken slip ring. | 4th Apr 1927 | Box 57 \ 2 Scan176 | |
| Alteration of a magneto sleeve for experimental purposes. | 4th Apr 1927 | Box 57 \ 2 Scan177 | |
| Agreeing to a previous note regarding a Watford FO.1 Magneto, number 78772. | 5th Apr 1927 | Box 57 \ 2 Scan178 | |
| Requesting the overhaul and remagnetising of a Watford RO1 Magneto for special timing tests. | 6th Apr 1927 | Box 57 \ 2 Scan179 | |
| Magneto requirements for Phantom and 20HP models, and issues with supplier North & Co. | 15th Apr 1927 | Box 57 \ 2 Scan180 | |
| Letter from F.H. Royce detailing requirements for magnetos for the Phantom and 20HP cars. | 26th Apr 1927 | Box 57 \ 2 Scan181 | |
| Requesting an alteration to a Watford ROL. Magneto sleeve for timing tests. | 28th Apr 1927 | Box 57 \ 2 Scan182 | |
| Proposed magneto modification for the 20 HP chassis. | 17th May 1927 | Box 57 \ 2 Scan183 | |
| Instructions regarding the examination of a Watford RO1 magneto after a 10,000-mile test. | 27th May 1927 | Box 57 \ 2 Scan184 | |
| Instructions regarding the testing of a petrol-proof instruction plate for a Watford RO1 magneto. | 2nd Nov 1927 | Box 57 \ 2 Scan185 | |
| The results of petrol-proofing tests on instruction plates for a Watford RO1 Magneto. | 3rd Nov 1927 | Box 57 \ 2 Scan186 | |
| Suitability and prolonged testing of Bosch magnetos for 6-cylinder and 20 HP cars. | 12th Dec 1927 | Box 57 \ 2 Scan187 | |
| Testing and performance of Bosch magnetos for the 20 HP chassis. | 13th Dec 1927 | Box 57 \ 2 Scan188 | |
| Reducing the specified range for the 20 HP magneto and potential design changes. | 13th Dec 1927 | Box 57 \ 2 Scan189 | |
| The falling efficiency and misfiring issues of the RO.1. Magneto. | 13th Mar 1928 | Box 57 \ 2 Scan190 | |
| Letter to Messrs. North & Sons regarding complaints about the performance and testing of R.O.1 magnetos. | 14th Mar 1928 | Box 57 \ 2 Scan191 | |
| Query regarding the production acceptance test for R.O.1. magnetos. | 5th Mar 1928 | Box 57 \ 2 Scan192 | |
| The testing of R.O. 1 magnetos, specifically the failure of magneto No.103503 upon re-test. | 16th Mar 1928 | Box 57 \ 2 Scan193 | |
| The return of Magneto No. 103503 to North & Sons Ltd. for investigation. | 19th Mar 1928 | Box 57 \ 2 Scan194 | |
| Instructions for a new electrical performance specification for magnetos on the 20HP chassis. | 27th Mar 1928 | Box 57 \ 2 Scan195 | |
| Specification of performance for a magneto for the 20 HP car. | 29th Mar 1928 | Box 57 \ 2 Scan196 | |
| Magneto testing procedures and performance requirements. | 29th Mar 1928 | Box 57 \ 2 Scan197 | |
| Specifications for magneto performance including timing lever positions and operational limits. | 3rd Apr 1928 | Box 57 \ 2 Scan198 | |
| Letter to Messrs. North & Sons Ltd. regarding a specification for R.O.I. magnetos for a 20 HP chassis. | 3rd Apr 1928 | Box 57 \ 2 Scan199 | |
| Issues with Watford R.O.1 magnetos and the sourcing of a less costly replacement. | 11th Apr 1928 | Box 57 \ 2 Scan200 | |
| Suspected depreciation of magnetism in Watford magnetos types EC6, EW6, and RO1. | 28th Apr 1928 | Box 57 \ 2 Scan201 | |
| The depreciation of magnetism in Watford Magnetos, types EC6 and H01. | 30th Apr 1928 | Box 57 \ 2 Scan202 | |
| Comparing the performance of Watford, Lucas, and Thomson-Houston magnetos for cars and aero engines. | 21th Jun 1928 | Box 57 \ 2 Scan203 | |
| Request to test a magneto for misfires at specific speeds and load conditions. | 20th Sep 1928 | Box 57 \ 2 Scan204 | |
| Instructions regarding complaints and testing of inefficient Watford R01 magnetos. | 26th Sep 1928 | Box 57 \ 2 Scan205 | |
| Instructions regarding a failure to comply with specifications, detailing issues with safety gap voltage and an obsolete contact breaker. | 8th Dec 1924 | Box 57 \ 2 Scan206 | |
| Faulty Watford R.O.1. magneto requiring correction. | 29th Aug 1929 | Box 57 \ 2 Scan207 | |
| Faulty Watford R.O.1 magneto, confirming the fault and requesting a replacement. | 29th Sep 1928 | Box 57 \ 2 Scan208 | |
| Letter to Messrs. North & Sons Ltd. regarding complaints and test failures of R.O.I. magnetos on a 20 HP chassis. | 29th Sep 1928 | Box 57 \ 2 Scan209 | |
| Page two of a letter regarding a complaint about a misfiring magneto, No. 105629. | 4th Oct 1928 | Box 57 \ 2 Scan210 | |
| Urgent internal memo regarding the repair of a broken Watford Magneto Armature. | 4th Oct 1928 | Box 57 \ 2 Scan211 | |
| Letter from North & Sons, Ltd. acknowledging receipt of correspondence and promising a full reply. | 8th Oct 1928 | Box 57 \ 2 Scan212 | |
| Follow-up letter to Messrs. North & Sons Ltd. requesting a report on R.O.1. magneto failures. | 1st Jan 1929 | Box 57 \ 2 Scan213 | |
| Test and inspection record for Watford Type R.O.1 magnetos. | 20th Dec 1926 | Box 57 \ 2 Scan214 | |
| Instructions regarding the inefficiency and noise of Watford ROI magnetos on the 20HP chassis. | 31th Dec 1928 | Box 57 \ 2 Scan215 | |
| Letter from North & Sons, Ltd. regarding a test report for Magneto No 105629. | 11th Jan 1929 | Box 57 \ 2 Scan216 | |
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