| Description | Date | Identifier | |
| Use of high conductivity copper for the Goshawk commutator and brush system. | 9th Jan 1924 | Box 50 \ 5 Scan276 | |
| Goshawk dynamo brushes, confirming EG.2 Morganite brushes as a satisfactory alternative to standard Z Le Carbone brushes. | 9th Jan 1924 | Box 50 \ 5 Scan277 | |
| Inspection report on a Dynamo R3 after a total mileage of 3923 miles. | 7th Jan 1924 | Box 50 \ 5 Scan278 | |
| Material and brush wear of a 20 HP Dynamo Commutator. | 11th Jan 1924 | Box 50 \ 5 Scan279 | |
| Wear and material properties for a 20 HP Dynamo Brush and Commutator. | 14th Jan 1924 | Box 50 \ 5 Scan280 | |
| The Goshawk Commutator & Brush System, specifically regarding the use of hard-drawn copper and the process of annealing. | 17th Jan 1934 | Box 50 \ 5 Scan281 | |
| Request to build a standard Dynamo Commutator with annealed copper bars for testing. | 23th Jan 1924 | Box 50 \ 5 Scan282 | |
| Confirming a Goshawk Dynamo with annealed Comm Bars has been passed for testing. | 2nd Feb 1924 | Box 50 \ 5 Scan283 | |
| Blueprint of dynamo brush setting diagrams for Goshawk and E.A.C. models. | 29th Feb 1924 | Box 50 \ 5 Scan284 | |
| Confirming the replacement of a dynamo for a 10,000-mile test and discussing modifications for new brush gear. | 4th Mar 1924 | Box 50 \ 5 Scan285 | |
| Letter from supplier 'Le Carbone' explaining a delivery delay for an order due to a strike at their works. | 4th Mar 1924 | Box 50 \ 5 Scan286 | |
| Letter from ROY to EFC regarding supply difficulties for carbon brushes from the supplier Le Carbone. | 1st Mar 1924 | Box 50 \ 5 Scan287 | |
| Goshawk dynamo brushes, recommending EG.2 Morganite brushes as an alternative in case of supply failure. | 6th Mar 1924 | Box 50 \ 5 Scan288 | |
| Goshawk dynamo commutation, comparing standard and Morganite brushes on various chassis. | 7th Mar 1924 | Box 50 \ 5 Scan289 | |
| The examination and mileage testing of various dynamos and their brushes. | 7th Mar 1924 | Box 50 \ 5 Scan290 | |
| Analysis of dynamo and brush material performance on different types of commutators. | 7th Mar 1924 | Box 50 \ 5 Scan291 | |
| Bad commutation issues related to armature slots and upcoming reports on armatures and dynamo brush gear. | 7th Mar 1924 | Box 50 \ 5 Scan292 | |
| Inspection report on the condition of four chassis dynamos after road testing. | 7th Jan 1924 | Box 50 \ 5 Scan293 | |
| Inspection report for Dynamo 470 from chassis 6GII with Ego Morganite brushes, detailing wear and test results. | 21th Jan 1924 | Box 50 \ 5 Scan294 | |
| Inspection report on a Goshawk Dynamo R3 from 7GII after running 5419 miles. | 7th Feb 1924 | Box 50 \ 5 Scan295 | |
| The condition of a Dynamo D from chassis 4GII after running 5513 miles. | 4th Mar 1924 | Box 50 \ 5 Scan296 | |
| Use of Morganite versus LeCarbone dynamo brushes for the 20HP model. | 21th Mar 1924 | Box 50 \ 5 Scan297 | |
| Issuing a standardisation sheet for 20 HP Dynamo Brushes. | 24th Mar 1924 | Box 50 \ 5 Scan298 | |
| Promising results of bench tests on an annealed copper commutator for a 20 HP dynamo and planning for further experimental use. | 25th Mar 1924 | Box 50 \ 5 Scan299 | |
| Instruction sheet detailing test results for a 20 hp Dynamo M with an annealed copper commutator. | 19th Mar 1924 | Box 50 \ 5 Scan300 | |
| Sending a 20 HP Dynamo M with an annealed copper commutator for installation. | 27th Mar 1924 | Box 50 \ 5 Scan301 | |
| Proposal to test a 20 HP dynamo commutator made from 57 segments of annealed copper, including relevant blueprint references. | 31th Mar 1924 | Box 50 \ 5 Scan302 | |
| Difficulties obtaining 20 HP Dynamo Brushes from LeCarbone and requesting a Standardisation Sheet. | 4th Apr 1924 | Box 50 \ 5 Scan303 | |
| Standardisation of Morganite EG.2 quality brushes for 20 HP dynamos as a secondary supply option. | 25th Mar 1924 | Box 50 \ 5 Scan304 | |
| The standardisation sheet for Morganite brushes for a 20 HP Dynamo. | 5th Apr 1924 | Box 50 \ 5 Scan305 | |
| Sourcing LeCarbone brushes for 20HP dynamos and the importance of maintaining stock and a consistent supplier. | 7th Apr 1924 | Box 50 \ 5 Scan306 | |
| Issues with oversized and rigid flexible brush pigtails on E.A.C. dynamos and proposing modifications. | 10th Apr 1924 | Box 50 \ 5 Scan307 | |
| Road test report for EG2 grade 20hp dynamo brushes. | 25th Apr 1924 | Box 50 \ 5 Scan308 | |
| Request to re-solder the commutator connections for a Goshawk dynamo armature. | 1st May 1924 | Box 50 \ 5 Scan309 | |
| The testing and repair procedure for a 20 HP Dynamo Armature. | 2nd May 1924 | Box 50 \ 5 Scan310 | |
| Investigation and repair procedure for customer-returned dynamos with overheating faults. | 2nd May 1924 | Box 50 \ 5 Scan311 | |
| Internal order request for Goshawk dynamo brushes specifying quantities and material grades. | 28th May 1924 | Box 50 \ 5 Scan312 | |
| Distorted and unfit commutator on a 20 HP Chassis Dynamo R3. | 30th May 1924 | Box 50 \ 5 Scan313 | |
| Technical notes and specifications for the Goshawk dynamo, including details on armatures, current-density, brush-gear and brush spans. | 5th Jun 1924 | Box 50 \ 5 Scan314 | |
| Potential use of sheet Bakelite instead of powder form for manufacturing commutators. | 13th Jun 1924 | Box 50 \ 5 Scan315 | |
| The standardisation of Morganite EG.2 quality brushes as a backup for the 20 HP dynamo. | 18th Jun 1924 | Box 50 \ 5 Scan316 | |
| Testing Morganite EG.2 brushes for a 20 HP Dynamo, detailing test progress and ordering more parts. | 19th Jun 1924 | Box 50 \ 5 Scan317 | |
| Requesting bursting tests to be carried out on a moulded commutator. | 19th Jun 1924 | Box 50 \ 5 Scan318 | |
| Instruction memo regarding the transfer and issuance of main commutator brushes for an experimental order. | 20th Jun 1924 | Box 50 \ 5 Scan319 | |
| Instructions and test results for a No. R3 Dynamo (9II) with an annealed copper commutator, intended for a 20HP chassis. | 21th Jun 1924 | Box 50 \ 5 Scan320 | |
| Test and inspection report showing performance data and handwritten notes on the condition of a commutator and brush. | 29th Aug 1920 | Box 50 \ 5 Scan321 | |
| The condition of E.G.2 brushes from a Goshawk R.3 dynamo after testing. | 21th Jun 1924 | Box 50 \ 5 Scan322 | |
| Instructions regarding a dynamo with an annealed copper commutator. | 29th Feb 1920 | Box 50 \ 5 Scan323 | |
| Production test results for a Goshawk Dynamo R3 with an annealed copper commutator. | 21th Jun 1924 | Box 50 \ 5 Scan324 | |
| Fitting a tested dynamo with an annealed copper commutator to an experimental car. | 23th Jun 1923 | Box 50 \ 5 Scan325 | |
| Test results for the engine-hot output of a NORB Goshawk dynamo with an annealed copper commutator, showing speed vs amperage. | 26th Jun 1924 | Box 50 \ 5 Scan326 | |
| Confirming the reservation of Main and Control brushes for an experimental order. | 30th Jun 1924 | Box 50 \ 5 Scan327 | |
| Requesting the undercutting of a Goshawk dynamo commutator from chassis Ø-GI. | 4th Jul 1924 | Box 50 \ 5 Scan328 | |
| The bursting test of a moulded commutator, comparing results to previous tests. | 4th Jul 1924 | Box 50 \ 5 Scan329 | |
| Instructions for a moulded commutator bursting test. | 4th Jul 1924 | Box 50 \ 5 Scan330 | |
| Test report on a commutator under cold and hot conditions. | 29th Jun 1929 | Box 50 \ 5 Scan331 | |
| Commutator failure test, identifying temperature as the main cause of the moulding's disintegration. | 28th Jun 1920 | Box 50 \ 5 Scan332 | |
| Returning the spindle from a burst moulded commutator test and requesting the parts. | 7th Jul 1924 | Box 50 \ 5 Scan333 | |
| Chipping of dynamo and motor brushes and proposing solutions to improve bedding. | 8th Jul 1924 | Box 50 \ 5 Scan334 | |
| Advantages and methods for polishing brushes for commutators. | 1st Jul 1924 | Box 50 \ 5 Scan335 | |
| Modifications to dynamo brushes, specifically the radius and chamfer, to prevent chipping. | 14th Jul 1924 | Box 50 \ 5 Scan336 | |
| Experiments on brushes, specifically bedding for different radii, involving the Le Carbone Company. | 14th Jul 1924 | Box 50 \ 5 Scan337 | |
| The standard brushes received for a 20 HP Dynamo. | 17th Jul 1924 | Box 50 \ 5 Scan338 | |
| Modified brushes for a 20 HP Dynamo. | 12th Aug 1924 | Box 50 \ 5 Scan339 | |
| The return of a moulded commutator after bursting tests. | 13th Aug 1924 | Box 50 \ 5 Scan340 | |
| Proposal to try out polished dynamo brushes for a 20 HP chassis to reduce sliding resistance. | 13th Aug 1924 | Box 50 \ 5 Scan341 | |
| Tests with reversed polarity on a Goshawk dynamo D. | 25th Aug 1924 | Box 50 \ 5 Scan342 | |
| Instructions and observations on the condition of dynamo brushes and commutator after testing. | 29th Jun 1920 | Box 50 \ 5 Scan343 | |
| Observations from a test on commutator and brush conditions under reversed and normal polarity. | 2nd Sep 1924 | Box 50 \ 5 Scan344 | |
| The decision to halt the polishing of dynamo brushes pending an experimental report. | 2nd Sep 1924 | Box 50 \ 5 Scan345 | |
| Price increase and manufacturing tolerance changes for polished dynamo brushes from supplier Messrs. Le Carbone. | 27th Aug 1924 | Box 50 \ 5 Scan346 | |
| The testing of polished versus unpolished Goshawk Dynamo Brushes, finding no advantage in their use. | 10th Sep 1924 | Box 50 \ 5 Scan347 | |
| Bench rig test of polished Z brushes on Dynamo B, detailing performance and wear. | 10th Sep 1924 | Box 50 \ 5 Scan348 | |
| 20 HP dynamo commutation when running with opposite electrical polarity, concluding the experiments are discontinued. | 15th Sep 1924 | Box 50 \ 5 Scan349 | |
| Test report on LFC2 main and LFC3AB8 control brushes for a 20 HP dynamo. | 8th Oct 1924 | Box 50 \ 5 Scan350 | |
| Test report on various grades of Goshawk Dynamo twin type brushes. | 6th Nov 1924 | Box 50 \ 5 Scan351 | |
| Extract of a communication regarding the battery and dynamo for chassis No. 3G2. | 15th Dec 1924 | Box 50 \ 5 Scan352 | |
| Internal request for a mileage update and inspection report on Morganite dynamo brushes on chassis 4-GII. | 4th Feb 1925 | Box 50 \ 5 Scan353 | |
| Diagrams for dynamo brush settings for 57 coil armatures. | 3rd Feb 1925 | Box 50 \ 5 Scan354 | |
| Instruction sheet detailing the results of a further test on a set of dynamo brushes. | 9th Feb 1925 | Box 50 \ 5 Scan355 | |
| The performance and wear of Z brushes and an annealed commutator after a bench run. | 18th Feb 1925 | Box 50 \ 5 Scan356 | |
| 20 HP Dynamo E failure due to a sticking brush, subsequent repair, and condition. | 19th May 1925 | Box 50 \ 5 Scan357 | |
| Instructions sheet detailing observations on brush wear and lubrication issues. | 29th Aug 1920 | Box 50 \ 5 Scan358 | |
| Schedule of brush and commutator tests on 20 HP dynamos. | 26th Feb 1925 | Box 50 \ 5 Scan359 | |
| Specifications for dynamo and starter motor brushes for a 20 HP Chassis. | 3rd Mar 1925 | Box 50 \ 5 Scan360 | |
| From EFC to AJS thanking them for a report on the dynamo on vehicle 4-GII. | 9th Mar 1925 | Box 50 \ 5 Scan361 | |
| The condition and wear of the dynamo brushes for car 4.G.11, including a diagram. | 1st Mar 1925 | Box 50 \ 5 Scan362 | |
| Condition of the dynamo and commutator brushes for 20 HP Chassis No. 3.G.2. | 30th Mar 1925 | Box 50 \ 5 Scan363 | |
| Instruction sheet detailing a report on 20hp Dynamos M and R3. | 30th Apr 1925 | Box 50 \ 5 Scan364 | |
| Instruction about a drop in main brush spring pressure and a report on component R.B.3. | 20th May 1925 | Box 50 \ 5 Scan365 | |
| Experiments comparing annealed copper commutators with standard hard-drawn copper commutators for dynamos. | 20th May 1925 | Box 50 \ 5 Scan366 | |
| Instruction sheet detailing the condition of a 20hp Dynamo 288 removed from chassis 59II. | 3rd Jul 1925 | Box 50 \ 5 Scan367 | |
| The condition of bushes, noting dust accumulation and un-soldered wires. | 29th Jun 1920 | Box 50 \ 5 Scan368 | |
| Instruction sheet on the condition of a 20hp Dynamo 470 after completing 17,270 miles. | 1st Sep 1925 | Box 50 \ 5 Scan369 | |
| Extract detailing an intermittent dynamo failure, noting issues with the cutout and excessive sparking. | 23th Aug 1925 | Box 50 \ 5 Scan370 | |
| Letter discussing a dynamo fault on chassis 9-GIII and suggesting a remedy involving cleaning the brushes and commutator. | 25th Aug 1925 | Box 50 \ 5 Scan371 | |
| 10,000-mile test of a 20 HP vehicle, focusing on electrical equipment issues. | 22th Sep 1925 | Box 50 \ 5 Scan372 | |
| The performance test of EG.2 brushes on a 20 HP dynamo. | 22th Sep 1924 | Box 50 \ 5 Scan373 | |
| Instructions and report for a repeat test on EG2 dynamo brushes, detailing wear and performance. | 20th Nov 1924 | Box 50 \ 5 Scan374 | |
| Inspection report on a Dynamo D fitted with EG2 brushes after 7830 miles of use. | 20th May 1925 | Box 50 \ 5 Scan375 | |
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