| Description | Date | Identifier | |
| Le Carbone brushes and pigtail conductors for the Goshawk Dynamo. | 12th Jun 1922 | Box 50 \ 5 Scan076 | |
| Instructions regarding re-moulded commutators for G II dynamos using various powders. | 19th Jun 1922 | Box 50 \ 5 Scan077 | |
| Requesting an update on the testing of moulded commutators and approval for quantity manufacturing. | 20th Jun 1922 | Box 50 \ 5 Scan078 | |
| Letter from Le Carbone regarding a Carbon Brush List and curves. | 20th Jun 1922 | Box 50 \ 5 Scan079 | |
| Page 2 of a letter regarding a Data Form, enclosing a Carbon Brush List and Set of Curves. | 20th Jun 1922 | Box 50 \ 5 Scan080 | |
| Bursting tests for moulded Goshawk commutators compared to orthodox mica and steel types. | 21th Jun 1922 | Box 50 \ 5 Scan081 | |
| Delivery of a Goshawk car to Mr. Royce, noting a broken dynamo and the loan of a spare battery. | 30th Jun 1922 | Box 50 \ 5 Scan082 | |
| Bursting tests conducted on moulded commutators at high speeds and temperatures. | 3rd Jul 1922 | Box 50 \ 5 Scan083 | |
| The temperature testing of commutators made from various materials like Elo, Mouldensite, and Bakelite. | 3rd Jul 1922 | Box 50 \ 5 Scan084 | |
| Test report on various moulding materials, detailing test conditions, results, and remarks. | 3rd Jul 1922 | Box 50 \ 5 Scan085 | |
| The testing of commutators, comparing different powders and segment shapes. | 3rd Jul 1922 | Box 50 \ 5 Scan086 | |
| The testing of gunmetal commutators, including proposed future tests using solder to indicate temperature. | 3rd Jul 1922 | Box 50 \ 5 Scan087 | |
| Delay in completing a generator and ongoing experiments with commutators for the 4-Goshawk-11. | 1st Jul 1922 | Box 50 \ 5 Scan088 | |
| Cover letter to Messrs. Le Carbone regarding a completed Data Form. | 10th Jul 1922 | Box 50 \ 5 Scan089 | |
| Modifications to the armature winding of a Goshawk 11 generator. | 11th Jul 1922 | Box 50 \ 5 Scan090 | |
| The results of bursting tests for moulded commutators, comparing mouldensite and Elo powder materials. | 13th Jul 1922 | Box 50 \ 5 Scan091 | |
| The completion of tests for moulding a commutator and a proposal for further trials. | 13th Jul 1922 | Box 50 \ 5 Scan092 | |
| Test report comparing the performance of different moulding materials under speed and temperature stress. | 13th Jul 1922 | Box 50 \ 5 Scan093 | |
| Test report detailing the results of speed and temperature tests on Bakelite and Mouldensite moulding materials. | 13th Jul 1922 | Box 50 \ 5 Scan094 | |
| Proposal for the design and testing of a Goshawk dynamo and starter motor. | 14th Jul 1922 | Box 50 \ 5 Scan095 | |
| Letter from 'Le Carbone' discussing the suitability of their 'Z' and 'EG30' carbon grades and offering a sample for testing. | 15th Jul 1922 | Box 50 \ 5 Scan096 | |
| Viability of using a moulded commutator, focusing on material stability under heat. | 15th Jul 1922 | Box 50 \ 5 Scan097 | |
| Performance of starter motor commutators with improved dimensions and materials. | 15th Jul 1922 | Box 50 \ 5 Scan098 | |
| Suitability of different grades of brushes from supplier Le Carbone for the Goshawk Dynamo. | 17th Jul 1922 | Box 50 \ 5 Scan099 | |
| Letter to Messrs. Le Carbone regarding the trial of E.G.30 and Z grade brushes. | 17th Jul 1922 | Box 50 \ 5 Scan100 | |
| Clarifying the supplier and commercial position of Mouldensite powder for moulded commutators. | 18th Jul 1922 | Box 50 \ 5 Scan101 | |
| Letter from Le Carbone confirming an accepted offer to supply samples of grade 'EG30' brushes for trial. | 18th Jul 1922 | Box 50 \ 5 Scan102 | |
| Experiments on moulded commutators using asbestos fibre and a commercial report on Mouldensite powder. | 18th Jul 1922 | Box 50 \ 5 Scan103 | |
| The source of supply and manufacturing details for Mouldensite powder. | 19th Jul 1922 | Box 50 \ 5 Scan104 | |
| Competitor, Pinchin Johnson & Co., starting production of a similar powder. | 19th Jul 1922 | Box 50 \ 5 Scan105 | |
| Cover memo attaching a letter from Le Carbone Company concerning dynamo brushes. | 19th Jul 1922 | Box 50 \ 5 Scan106 | |
| The investigation and repair of a faulty dynamo for a No.4 Goshawk engine. | 19th Jul 1922 | Box 50 \ 5 Scan107 | |
| Note on the manufacturing process of commutators, specifically the settling of plates and the importance of using sufficient heat and pressure. | 19th Jul 1922 | Box 50 \ 5 Scan108 | |
| Desired qualities of dynamo brushes, including resistance, wear, and issues with different makes. | 19th Jul 1922 | Box 50 \ 5 Scan109 | |
| Confirming an agreement to make moulded test pieces from various powders to test for deterioration and shrinkage of commutator materials. | 20th Jul 1922 | Box 50 \ 5 Scan110 | |
| Letter to a supplier rejecting sample brushes and requesting a recommendation for a new brush grade based on specific machine particulars. | 20th Jul 1922 | Box 50 \ 5 Scan111 | |
| Letter discussing generator brush arms and requesting recommendations on the brush grade for a new design. | 22th Jul 1922 | Box 50 \ 5 Scan112 | |
| Letter from The Morgan Crucible Company Limited discussing the trial results of different grades of brushes. | 22th Jul 1922 | Box 50 \ 5 Scan113 | |
| Technical data sheet from The Morgan Crucible Company, Ltd. detailing properties of electrical grades EG2 and EG0. | 24th Jul 1922 | Box 50 \ 5 Scan114 | |
| Proposal for trials and ordering of Morganite brushes for the Goshawk Dynamo. | 24th Jul 1922 | Box 50 \ 5 Scan115 | |
| Quality and supply issues of brushes for the Goshawk Dynamo. | 24th Jul 1922 | Box 50 \ 5 Scan116 | |
| Proposal to fit Morganite brushes on an experimental car's dynamo, comparing their insulation to Le Carbone's. | 24th Jul 1922 | Box 50 \ 5 Scan117 | |
| Comparison table of material properties for Le Carbone and Morganite grades. | 24th Jul 1922 | Box 50 \ 5 Scan118 | |
| Letter from The Morgan Crucible Company regarding trials of Link EG0 and Link EG2 brushes. | 26th Jul 1922 | Box 50 \ 5 Scan119 | |
| Letter from The Morgan Crucible Company Ltd regarding a covering order for trial grades. | 27th Jul 1922 | Box 50 \ 5 Scan120 | |
| The delivery of asbestos-filled Mouldensite samples. | 8th Aug 1922 | Box 50 \ 5 Scan121 | |
| Properties and potential use of Mouldensite moulding powder with an asbestos filler for dynamo commutators. | 9th Aug 1922 | Box 50 \ 5 Scan122 | |
| Recommending Le Carbon brushes over Morganite brushes for dynamos. | 12th Aug 1922 | Box 50 \ 5 Scan123 | |
| Recommending the investigation and use of Bakelite moulded commutators as a more economical alternative to mica. | 12th Aug 1922 | Box 50 \ 5 Scan124 | |
| Letter from Le Carbone regarding the dispatch of coppered carbon brushes for trial. | 14th Aug 1922 | Box 50 \ 5 Scan125 | |
| Inquiry about the successful manufacture of moulded bakelite commutators in the U.S.A. and the specific grade of bakelite powder used. | 14th Aug 1922 | Box 50 \ 5 Scan126 | |
| Supply issues with supplier Le Carbone regarding incorrectly sized glass bead insulation for carbon brushes. | 15th Aug 1922 | Box 50 \ 5 Scan127 | |
| Potential overheating concerns raised by Le Carbone for brushes D.50736 & D.50761 due to a reduced flexible diameter. | 29th Aug 1922 | Box 50 \ 5 Scan128 | |
| Confirming the approval of a reduced size flexible for Goshawk Dynamo Brushes. | 30th Aug 1922 | Box 50 \ 5 Scan129 | |
| That the brush springs for the Goshawk motor and dynamo are too strong and proposing new tension limits for the manufacturer. | 1st Sep 1922 | Box 50 \ 5 Scan130 | |
| Test results log for various moulding materials under speed and temperature stress. | 29th Jun 1922 | Box 50 \ 5 Scan131 | |
| Test log for commutators, detailing results of baking, insulation, and material tests. | 22th Mar 1922 | Box 50 \ 5 Scan132 | |
| Enquiry from a representative of Messrs. Le Carbone Co. regarding a report on Carbon Brushes E.G.30 Grade. | 13th Sep 1922 | Box 50 \ 5 Scan133 | |
| Testing status of Goshawk dynamo brushes from the Le Carbon Company. | 18th Sep 1922 | Box 50 \ 5 Scan134 | |
| Attached documents from the General Bakelite Co. of America for experimental work on Bakelite Moulded Commutators. | 21th Sep 1922 | Box 50 \ 5 Scan135 | |
| Goshawk dynamo brushes being too slack in their holders. | 30th Oct 1922 | Box 50 \ 5 Scan136 | |
| Highlighting the inconsistent width of Le Carbone dynamo brushes and requesting an investigation. | 11th Nov 1922 | Box 50 \ 5 Scan137 | |
| Correspondence regarding out-of-spec Dynamo Brushes for the Goshawk 11 engine. | 13th Nov 1922 | Box 50 \ 5 Scan138 | |
| Chasing an unfulfilled order for Morganite brushes for the Goshawk dynamo. | 1st Dec 1922 | Box 50 \ 5 Scan139 | |
| Follow-up letter from Le Carbone regarding the test results of carbon brushes. | 1st Dec 1922 | Box 50 \ 5 Scan140 | |
| Extracts from a paper on the properties and performance of carbon brushes. | 2nd Dec 1922 | Box 50 \ 5 Scan141 | |
| Technical notes on terminals, rings, and brush materials for electrical components. | 2nd Dec 1922 | Box 50 \ 5 Scan142 | |
| Summary of findings on commutator and brush performance issues from various contributors. | 12th Dec 1922 | Box 50 \ 5 Scan143 | |
| Faults, such as brush sparking, with the Brush & Commutator System on the Goshawk Dynamo. | 12th Dec 1922 | Box 50 \ 5 Scan144 | |
| Continued memorandum discussing issues with dynamo control brushes during production testing. | 12th Dec 1922 | Box 50 \ 5 Scan145 | |
| Letter from Le Carbone regarding sending samples of 'EG30' and 'EG60' grade control brushes. | 21th Dec 1922 | Box 50 \ 5 Scan146 | |
| Letter to Messrs. Le Carbone regarding testing different grades of control brushes for a small dynamo. | 22th Dec 1922 | Box 50 \ 5 Scan147 | |
| Letter from Le Carbone regarding testing samples and a control brush. | 23th Dec 1922 | Box 50 \ 5 Scan148 | |
| The progress of improvements to the Goshawk dynamo brushes and holders. | 16th Jan 1923 | Box 50 \ 5 Scan149 | |
| Letter from Le Carbone confirming the dispatch of carbon brush samples. | 18th Jan 1923 | Box 50 \ 5 Scan150 | |
| Acknowledgement of receipt of four sample brushes for testing. | 19th Jan 1923 | Box 50 \ 5 Scan151 | |
| Letter from insulation specialists H.E. Ashdown (Birmingham) Ltd. offering to supply Mica Commutator Rings. | 28th Jan 1923 | Box 50 \ 5 Scan152 | |
| Supply of Goshawk dynamo commutator rings and a strategy for price negotiation. | 30th Jan 1923 | Box 50 \ 5 Scan153 | |
| Letter responding to a telegram about sticking dynamo brushes on a generator. | 20th Feb 1923 | Box 50 \ 5 Scan154 | |
| The removal of coppering from Goshawk 11 dynamo brushes. | 23th Feb 1923 | Box 50 \ 5 Scan155 | |
| Issues and proposed solutions for the Goshawk II engine's electrical equipment, including the ignition and dynamo. | 7th Mar 1923 | Box 50 \ 5 Scan156 | |
| Failures of ignition contact and dynamo brushes for 4-GII electrical equipment. | 26th Mar 1923 | Box 50 \ 5 Scan157 | |
| Dynamo testing, detailing issues with contact sparking and the methodology for varying brush positions. | 26th Mar 1923 | Box 50 \ 5 Scan158 | |
| Continued discussion on testing for mechanical wear, experimenting with softer brushes, and commutator design. | 26th Mar 1923 | Box 50 \ 5 Scan159 | |
| Supply issues with Carbon Brushes for the 20-HP Chassis and testing an alternative supplier. | 6th Apr 1923 | Box 50 \ 5 Scan160 | |
| Investigations into reducing brush sparking on the Goshawk Dynamo and developing a new vibrator regulator. | 6th Apr 1923 | Box 50 \ 5 Scan161 | |
| Order for dynamo brushes for a 20 HP engine, comparing Morganite and Le Carbone types. | 1st Apr 1923 | Box 50 \ 5 Scan162 | |
| The mechanical wear of dynamo brushes from a Goshawk dynamo. | 16th Apr 1923 | Box 50 \ 5 Scan163 | |
| Telegram requesting two sets of Goshawk dynamo brushes. | 20th Sep 1918 | Box 50 \ 5 Scan164 | |
| Instruction sheet detailing the optimal main brush position for Goshawk dynamos. | 30th Apr 1923 | Box 50 \ 5 Scan165 | |
| Alteration to the main brush position on the Goshawk dynamo based on performance tests. | 30th Apr 1923 | Box 50 \ 5 Scan166 | |
| Instructions for setting the main brush movement and retard range on an E.A.C. dynamo. | 30th Apr 1923 | Box 50 \ 5 Scan167 | |
| Further tests and comparisons of three different Goshawk dynamo designs. | 30th Apr 1923 | Box 50 \ 5 Scan168 | |
| Status of brush material tests and upcoming tests on various dynamos and vibrator regulators. | 30th Apr 1923 | Box 50 \ 5 Scan169 | |
| Instruction regarding an alteration to the position of the main brushes for the Goshawk Dynamo. | 2nd May 1923 | Box 50 \ 5 Scan170 | |
| Standardisation sheet for the Goshawk dynamo brush position alteration. | 2nd May 1923 | Box 50 \ 5 Scan171 | |
| Performance graph showing the results of main-brush position tests on a Goshawk dynamo. | 11th Jan 1937 | Box 50 \ 5 Scan172 | |
| The results of dynamo tests concerning the Goshawk dynamo brush position. | 3rd May 1923 | Box 50 \ 5 Scan173 | |
| The performance curves and tests of various Goshawk dynamo configurations. | 3rd May 1923 | Box 50 \ 5 Scan174 | |
| 140 turn 20 SWG field winding, comparing its performance curves against the standard winding. | 3rd May 1923 | Box 50 \ 5 Scan175 | |
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