| Description | Date | Identifier | |
| Specification sheet for an armature, detailing its coil, slot, and conductor configuration. | 23th Oct 1929 | Box 68 \ 4 scan0066 | |
| To Mr. Brock regarding the monthly test of a 40/50 chassis dynamo. | 23th Oct 1929 | Box 68 \ 4 scan0067 | |
| Urgently requesting information concerning the present production 40/50 dynamo. | 1st Nov 1929 | Box 68 \ 4 scan0068 | |
| Replacement of a 40/50 HP dynamo. | 2nd Nov 1929 | Box 68 \ 4 scan0069 | |
| Customer complaints about insufficient dynamo output at high speeds. | 27th Feb 1928 | Box 68 \ 4 scan0070 | |
| Modifying a dynamo's armature winding to handle the higher electrical load of large headlamps. | 27th Feb 1928 | Box 68 \ 4 scan0071 | |
| Insufficient dynamo output on 20 HP & 40/50 HP models, with suggestions for improvement. | 13th Mar 1928 | Box 68 \ 4 scan0072 | |
| Specifications for a new 40/50 HP dynamo armature with a larger output and higher cutting-in speed. | 28th Mar 1928 | Box 68 \ 4 scan0073 | |
| Testing and suggestions for increasing the output and speed of 20 HP and 40/50 HP dynamos. | 28th Mar 1928 | Box 68 \ 4 scan0074 | |
| Page of engineering calculations for component dimensions, including slot and neck measurements. | 28th Mar 1928 | Box 68 \ 4 scan0075 | |
| Calculations and proposal for a 20 HP short-chorded armature design. | 28th Mar 1928 | Box 68 \ 4 scan0076 | |
| Calculations and design specifications for a 40/50 Case armature, page 4. | 28th Mar 1928 | Box 68 \ 4 scan0077 | |
| Page of calculations and specifications for conductor-pitch winding and slot dimensions. | 30th Mar 1928 | Box 68 \ 4 scan0078 | |
| Modifications to the dynamo armature to increase output at high speeds. | 30th Mar 1928 | Box 68 \ 4 scan0079 | |
| Specification table for 26 slot dynamo armature windings for 20 HP and 40/50 HP models. | 14th Apr 1928 | Box 68 \ 4 scan0080 | |
| Improvements to car dynamo output and design. | 18th Apr 1928 | Box 68 \ 4 scan0081 | |
| Replying to an enquiry about a delay in completing work on two 26 slot armatures. | 20th Apr 1928 | Box 68 \ 4 scan0082 | |
| Modifications to dynamo design, specifically altering pole pieces and armature slots, to improve output. | 18th Apr 1928 | Box 68 \ 4 scan0083 | |
| Design changes for a dynamo armature to achieve augmented output. | 23th Apr 1928 | Box 68 \ 4 scan0084 | |
| Two dynamo armatures with different speeds and outputs for the Phantom model. | 25th Apr 1928 | Box 68 \ 4 scan0085 | |
| Specification for modifying 40/50 and 20 HP dynamo armatures for greater output at higher speeds. | 25th Apr 1928 | Box 68 \ 4 scan0086 | |
| Modifications to an N.B. type dynamo for higher output at higher speeds. | 27th Apr 1928 | Box 68 \ 4 scan0087 | |
| Investigation into a modified wide brush dynamo with an initially excessive output, which was altered to meet requirements. | 28th Apr 1928 | Box 68 \ 4 scan0088 | |
| Instruction note comparing a modified machine's electrical output against a standard one, referencing attached performance curves. | 8th Dec 1924 | Box 68 \ 4 scan0089 | |
| Modifying 20 HP and 40/50 HP dynamos for greater output and higher cutting-in speed. | 4th May 1928 | Box 68 \ 4 scan0090 | |
| Page of engineering calculations for component dimensions such as slot and neck depths. | 4th May 1928 | Box 68 \ 4 scan0091 | |
| Calculations for a 40/50 case armature redesign, changing from four to three turns per coil. | 9th May 1928 | Box 68 \ 4 scan0092 | |
| Request to manufacture a higher output dynamo armature for a 40/50 chassis. | 9th May 1928 | Box 68 \ 4 scan0093 | |
| Modification of a standard 40/50 HP dynamo (CH.85) for higher output. | 19th May 1928 | Box 68 \ 4 scan0094 | |
| Instructions for modifying Phantom chassis dynamos to increase output. | 21th May 1928 | Box 68 \ 4 scan0095 | |
| Instruction memo regarding testing a modified Dynamo, No. CH 85 M, and arranging for its despatch. | 6th Jun 1928 | Box 68 \ 4 scan0096 | |
| Short memo confirming the handover date of a Phantom Chassis Dynamo. | 9th Jun 1928 | Box 68 \ 4 scan0097 | |
| Modified Phantom dynamo with higher output. | 4th Jun 1928 | Box 68 \ 4 scan0098 | |
| Customer complaint about an inefficient dynamo on a Phantom chassis and arranging for a replacement. | 18th Jun 1928 | Box 68 \ 4 scan0099 | |
| Instruction regarding the modification of Dynamo poles on a Phantom CH85M for increased output. | 22th Jun 1928 | Box 68 \ 4 scan0100 | |
| Customer enquiries for higher output dynamos and the solution for high-speed overcharging issues. | 23th Jun 1928 | Box 68 \ 4 scan0101 | |
| Retesting of a twice-modified Phantom Dynamo CH.85 for higher output. | 26th Jun 1928 | Box 68 \ 4 scan0102 | |
| Replacement dynamo for Phantom Chassis No. CH.85, for a customer in Paris. | 27th Jun 1928 | Box 68 \ 4 scan0103 | |
| Time and cost calculation sheet for assembly G.6347. | 14th Jul 1928 | Box 68 \ 4 scan0104 | |
| Higher output armatures for 20 HP and 40/50 HP dynamos, discussing testing and supply. | 14th Jul 1928 | Box 68 \ 4 scan0105 | |
| The experimental testing and handover of a higher output armature for the Phantom. | 30th Aug 1928 | Box 68 \ 4 scan0106 | |
| Experimental test results for a Phantom dynamo with a coarser gauge armature for higher output. | 31th Aug 1928 | Box 68 \ 4 scan0107 | |
| Performance tests on a higher output dynamo armature, including brush settings and commutation results. | 31th Aug 1928 | Box 68 \ 4 scan0108 | |
| Blueprint chart showing the representative performance curve of a J Machine Dynamo. | 13th Sep 1928 | Box 68 \ 4 scan0109 | |
| Higher output dynamo for a 12-EX machine, detailing parts required and modifications. | 13th Sep 1928 | Box 68 \ 4 scan0110 | |
| The delivery of a higher output dynamo armature for a Phantom model. | 14th Sep 1928 | Box 68 \ 4 scan0111 | |
| Materials to build 12 higher output dynamos for the Phantom. | 17th Sep 1926 | Box 68 \ 4 scan0112 | |
| Cancelling a previous instruction regarding a modified dynamo and requesting its return. | 25th Sep 1928 | Box 68 \ 4 scan0113 | |
| Requesting three higher output Phantom dynamos for confirmatory testing. | 10th Oct 1928 | Box 68 \ 4 scan0114 | |
| Critique of the Phantom dynamo's inability to charge the battery with headlights on and a proposal for a new design. | 2nd Oct 1923 | Box 68 \ 4 scan0115 | |
| Report to Mr. Royce and a customer's suggestion for the Chief Engineer. | 3rd Oct 1928 | Box 68 \ 4 scan0116 | |
| Customer's suggestion for a higher output 'dual debit' dynamo. | 3rd Oct 1928 | Box 68 \ 4 scan0117 | |
| Design implications of a higher output dynamo, specifically the increase in weight and size. | 4th Oct 1928 | Box 68 \ 4 scan0118 | |
| Request to receive two 40/50 dynamos, D.71914, for testing. | 14th Nov 1928 | Box 68 \ 4 scan0119 | |
| Reporting the satisfactory test of a Phantom Dynamo with higher output and outlining further steps. | 15th Nov 1928 | Box 68 \ 4 scan0120 | |
| Return and successful testing of a loaned higher output dynamo machine. | 22th Nov 1928 | Box 68 \ 4 scan0121 | |
| Production specification for inspection and testing of an R.R. EAC. Dynamo of the N.B. type with a higher output armature. | 4th Dec 1928 | Box 68 \ 4 scan0122 | |
| Specification of inspection and test for an R.R. EAC. Dynamo of the N.B. type with a higher output armature. | 4th Dec 1928 | Box 68 \ 4 scan0123 | |
| Test procedure for a dynamo, detailing brush bedding, insulation resistance, and clearance checks. | 4th Dec 1928 | Box 68 \ 4 scan0124 | |
| Testing procedures and specifications for a dynamo, including brush bedding and running tests. | 4th Dec 1928 | Box 68 \ 4 scan0125 | |
| Inspection and testing procedures for an electrical machine, page 4. | 10th Dec 1928 | Box 68 \ 4 scan0126 | |
| To Mr. Brock confirming a dynamo has passed tests and that future testing will be handled by his department. | 10th Dec 1928 | Box 68 \ 4 scan0127 | |
| Production test report for higher-output narrow brush dynamos. | 20th Feb 1930 | Box 68 \ 4 scan0128 | |
| Dynamo charging current issues and potential solutions for electrical equipment. | 30th Jan 1929 | Box 68 \ 4 scan0129 | |
| Dynamo characteristics, battery charging, and requirements for headlamp lighting and anti-dazzle mechanisms. | 28th Jan 1929 | Box 68 \ 4 scan0130 | |
| Improving dynamo output to support more powerful headlamps and prevent battery drain. | 30th Jan 1929 | Box 68 \ 4 scan0131 | |
| Development of higher output dynamos and the associated risk of battery overcharging. | 30th Jan 1929 | Box 68 \ 4 scan0132 | |
| Continued discussion on dynamo output limitations, potential heating issues, and the development of automatic control. | 1st Feb 1929 | Box 68 \ 4 scan0133 | |
| Comparison of standard and higher output dynamos, detailing charging rates and the potential risk of battery deterioration. | 1st Feb 1929 | Box 68 \ 4 scan0134 | |
| Battery charging issues, dynamo output curves, and the experimental use of a green lamp indicator. | 1st Feb 1929 | Box 68 \ 4 scan0135 | |
| Experiments with higher output dynamos and green lamp schemes on various chassis. | 1st Feb 1929 | Box 68 \ 4 scan0136 | |
| Pros and cons of increasing dynamo output to meet higher electrical demands on cars. | 1st Feb 1929 | Box 68 \ 4 scan0137 | |
| Performance, limitations, and potential improvements of the dynamo output. | 5th Feb 1929 | Box 68 \ 4 scan0138 | |
| Machine output, weight considerations, and the inclusion of a green lamp indicator. | 5th Feb 1929 | Box 68 \ 4 scan0139 | |
| Dynamo output for the 'SS' Chassis, focusing on avoiding weight increase and improving electrical efficiency through various tests. | 1st Feb 1929 | Box 68 \ 4 scan0140 | |
| Dynamo output and recommendations for a new intermediate armature. | 2nd Feb 1929 | Box 68 \ 4 scan0141 | |
| Optimal number of slots for an intermediate output armature to reduce noise and comparing conductor sizes for different models. | 21th Feb 1929 | Box 68 \ 4 scan0142 | |
| Comparison of armature designs, recommending a 24-slot Phantom armature for experimental construction. | 4th Mar 1929 | Box 68 \ 4 scan0143 | |
| Instructing intermediate output dynamos to resolve battery charging complaints. | 4th Mar 1929 | Box 68 \ 4 scan0144 | |
| Specification sheet for an armature detailing its construction and winding data. | 25th Apr 1929 | Box 68 \ 4 scan0145 | |
| Unsuitability of the current S.S. chassis dynamo for chassis 21-EX and the need for a new machine. | 25th Apr 1929 | Box 68 \ 4 scan0146 | |
| Request to remove a higher output dynamo from chassis 12-EX for examination after 10,000 miles, with a replacement provided. | 4th Jun 1929 | Box 68 \ 4 scan0147 | |
| Electrical experimental record sheet for a higher-output dynamo, model H.O.1. | 10th Jun 1929 | Box 68 \ 4 scan0148 | |
| Examination and test report for a Higher-Output Dynamo H.O1 after a 10,000 miles test. | 10th Jun 1929 | Box 68 \ 4 scan0149 | |
| Instruction sheet detailing the results of a machine performance test after being run on a bench. | 8th Dec 1924 | Box 68 \ 4 scan0150 | |
| The production and testing of higher output dynamos for 40/50 HP and 20 HP models. | 4th Jul 1929 | Box 68 \ 4 scan0151 | |
| The testing and development of higher and intermediate output dynamos for various horsepower models. | 5th Jul 1929 | Box 68 \ 4 scan0152 | |
| The development and testing of new 24-slot armatures designed to replace the standard 28-slot models. | 6th Jul 1929 | Box 68 \ 4 scan0153 | |
| Production and supply of higher output dynamos for various car chassis. | 6th Jul 1929 | Box 68 \ 4 scan0154 | |
| Requesting to swap a faulty Higher Output Dynamo (H.O.1) with a test dynamo (L) on vehicle 14-EX. | 6th Nov 1929 | Box 68 \ 4 scan0155 | |
| Dynamo output and battery charging issues for 20 HP and Phantom II models. | 28th Nov 1929 | Box 68 \ 4 scan0156 | |
| The development of intermediate output dynamos with major and minor output settings. | 28th Nov 1929 | Box 68 \ 4 scan0157 | |
| Dynamo output options and testing for 20 HP and Phantom models. | 28th Nov 1929 | Box 68 \ 4 scan0158 | |
| Modifications to increase dynamo output for Phantom and 20 HP models. | 1st Feb 1930 | Box 68 \ 4 scan0159 | |
| Advantages of 48 coil armatures over 56 coil types and outlining future development plans for machine outputs. | 1st Feb 1930 | Box 68 \ 4 scan0160 | |
| The development and testing of higher output dynamos and armatures for various chassis models. | 17th Dec 1913 | Box 68 \ 4 scan0161 | |
| Requesting particulars of a Peerless motor, specifically its brush holder and winding, and commenting on its poor efficiency. | 17th Dec 1913 | Box 68 \ 4 scan0162 | |
| Specifications for a Peerless Starting Dynamo, detailing its components including the brush holders, armature, and field coils. | 15th Jan 1914 | Box 68 \ 4 scan0163 | |
| From M. Olley detailing Mr. Royce's suggestions for forming armature windings for a self-starter motor and dynamo. | 27th Jul 1914 | Box 68 \ 4 scan0164 | |
| Drawing specifications, issues with a slack tape fit, and a request for new windings for an Actuating Box. | 23th Nov 1914 | Box 68 \ 4 scan0165 | |
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