| Description | Date | Identifier | |
| Graph of output speed curves showing the effect of series winding excited by headlamp current on a standard machine. | 2nd Sep 1931 | Box 60 \ 4 Scan094 | |
| Letter to Bosch Ltd questioning the high cut-out voltage setting on a 200-watt dynamo. | 11th Nov 1931 | Box 60 \ 4 Scan095 | |
| Letter from Bosch regarding the cut-out voltage of a 200-watt dynamo and arranging for its return for adjustment. | 18th Nov 1931 | Box 60 \ 4 Scan096 | |
| Letter to Bosch Ltd. regarding the self-adjustment of a 200 watt dynamo cut-out. | 19th Nov 1931 | Box 60 \ 4 Scan097 | |
| Request to modify drive couplings and shorten a magneto drive shaft to fit a Bosch regulated dynamo for testing. | 19th Nov 1931 | Box 60 \ 4 Scan098 | |
| Price list for a set of Bosch ignition units and regulator dynamo. | 20th Nov 1931 | Box 60 \ 4 Scan099 | |
| Letter from Marchal regarding dynamos and associated plans being sent to Rolls-Royce. | 23th Nov 1931 | Box 60 \ 4 Scan100 | |
| Issues with noisy dynamos due to the inaccessibility of the rear bearing for oiling and proposing a modification. | 23th Nov 1931 | Box 60 \ 4 Scan101 | |
| Fitting of a Bosch dynamo and comparing third brush and voltage control generators. | 23th Nov 1931 | Box 60 \ 4 Scan102 | |
| Preliminary report comparing a Bosch regulated dynamo against a third-brush controlled type. | 21th Nov 1931 | Box 60 \ 4 Scan103 | |
| Performance comparison and reliability assessment of a Bosch regulated dynamo versus a standard Rolls Royce dynamo. | 1st Nov 1931 | Box 60 \ 4 Scan104 | |
| Graph comparing the ampere output of 40/50 Standard and Bosch dynamos against dynamo RPM. | 19th Nov 1931 | Box 60 \ 4 Scan105 | |
| Letter to Projecteurs Marchal querying the performance of their dynamo and ignition coil winding method. | 26th Nov 1931 | Box 60 \ 4 Scan106 | |
| Cover note for an attached report concerning noisy dynamos. | 7th Nov 1931 | Box 60 \ 4 Scan107 | |
| Extract discussing the difficult problem of noisy dynamo bearings due to over and under-lubrication. | 24th Nov 1931 | Box 60 \ 4 Scan108 | |
| Advantages of 2-stage vibrator dynamos for future use. | 28th Nov 1931 | Box 60 \ 4 Scan109 | |
| Letter to Bosch Ltd. enquiring about a 150-watt dynamo machine and its price. | 4th Dec 1931 | Box 60 \ 4 Scan110 | |
| Letter from Bosch Limited discussing various dynamo types and their power output specifications. | 7th Dec 1931 | Box 60 \ 4 Scan111 | |
| Technical drawing and specifications for a Bosch RL alternator with voltage regulator. | 15th Sep 1931 | Box 60 \ 4 Scan112 | |
| German-language specification sheet explaining a model number with a performance table and accessories. | 18th Aug 1928 | Box 60 \ 4 Scan113 | |
| Specification sheet for a Bosch RK Dynamo with a voltage regulator, including diagrams, dimensions, and installation notes. | 18th Aug 1928 | Box 60 \ 4 Scan114 | |
| German specification sheet for dynamo/alternator models, explaining the type formula and listing accessories. | 8th Dec 1931 | Box 60 \ 4 Scan115 | |
| Translated letter from Société d'Exploitation Commerciale des Appareils Marchal answering queries about a dynamo and ignition coil. | 8th Dec 1931 | Box 60 \ 4 Scan116 | |
| The function of an ignition coil with external resistance for a 6-cylinder engine. | 8th Dec 1931 | Box 60 \ 4 Scan117 | |
| Letter from Marchal discussing the technical specifications of dynamos and ignition coils. | 8th Dec 1931 | Box 60 \ 4 Scan118 | |
| Letter from Appareils Marchal to Mr. West concerning a 12-volt coil with an external resistor. | 14th Dec 1931 | Box 60 \ 4 Scan119 | |
| Letter to Bosch Ltd. requesting British Patent Numbers for a dynamo supplied for testing. | 14th Dec 1931 | Box 60 \ 4 Scan120 | |
| Letter from Bosch Limited acknowledging a request for information about a specific Dynamo model. | 15th Dec 1931 | Box 60 \ 4 Scan121 | |
| Arranging the despatch of a faulty Bosch dynamo for repair. | 15th Dec 1931 | Box 60 \ 4 Scan122 | |
| Letter to Bosch Ltd. regarding a failure of a regulator on a 200W dynamo and requesting further technical information. | 15th Dec 1931 | Box 60 \ 4 Scan123 | |
| Second page of a letter regarding the return of dynamos and a regulator for inspection and repair. | 15th Dec 1931 | Box 60 \ 4 Scan124 | |
| Letter from Bosch requesting further information to investigate a faulty dynamo. | 16th Dec 1931 | Box 60 \ 4 Scan125 | |
| Letter from Bosch Limited concerning test results of a voltage regulated dynamo. | 16th Dec 1931 | Box 60 \ 4 Scan126 | |
| Response letter to Bosch Ltd. detailing the conditions of a dynamo test following a failure. | 17th Dec 1931 | Box 60 \ 4 Scan127 | |
| Price notification for a Bosch dynamo complete with regulator. | 17th Dec 1931 | Box 60 \ 4 Scan128 | |
| Letter from Bosch Limited explaining the potential causes of a dynamo failure, specifically melted and welded contacts. | 22th Dec 1931 | Box 60 \ 4 Scan129 | |
| Letter from Bosch Limited answering technical queries about a dynamo's performance and load. | 22th Dec 1931 | Box 60 \ 4 Scan130 | |
| Dynamo sent to Stuttgart for repair via Bosch Ltd. | 29th Dec 1931 | Box 60 \ 4 Scan131 | |
| Letter to Bosch Ltd. regarding a faulty dynamo, its testing, and return for inspection. | 30th Dec 1931 | Box 60 \ 4 Scan132 | |
| The status of a Bosch dynamo and regulator returned to Messrs. Bosch Ltd. | 9th Jan 1932 | Box 60 \ 4 Scan133 | |
| Requesting the removal of a Bosch starter motor and dynamo from a 4-litre Bentley engine for examination and testing. | 29th Jan 1932 | Box 60 \ 4 Scan134 | |
| Acquisition and testing of Bosch voltage regulated dynamos for J.3. and Peregrine projects. | 1st Jan 1932 | Box 60 \ 4 Scan135 | |
| Short internal note about acquiring Bosch Electrical Units and forwarding a request. | 1st Feb 1932 | Box 60 \ 4 Scan136 | |
| Letter to J.A. Stevens, Ltd. requesting a meeting to discuss Bosch equipment on Bentley cars and the status of a returned dynamo. | 12th Feb 1932 | Box 60 \ 4 Scan137 | |
| Requesting to fit a Bosch dynamo, as used on the Bentley, to vehicle 16.G.4. for comparative testing. | 1st Feb 1932 | Box 60 \ 4 Scan138 | |
| Letter from Bosch Limited regarding the takeover of J. A. Stevens Ltd., a visit about Bentley car equipment, and a dynamo awaiting customs clearance. | 16th Feb 1932 | Box 60 \ 4 Scan139 | |
| Investigating and obtaining a superior Marchal dynamo from a French firm for testing. | 6th Feb 1932 | Box 60 \ 4 Scan140 | |
| Sending a blueprint comparing dynamo curves with those of a Marchal dynamo. | 27th Feb 1932 | Box 60 \ 4 Scan141 | |
| Letter from Bosch Limited detailing test results for a Dynamo. | 27th Feb 1932 | Box 60 \ 4 Scan142 | |
| Technical letter detailing dynamo voltage regulations for a Bentley car and addressing experiences with Bosch Dynamos. | 27th Feb 1932 | Box 60 \ 4 Scan143 | |
| The concluding page of a letter from Bosch Limited. | 27th Feb 1932 | Box 60 \ 4 Scan144 | |
| Letter from C.A.V - BOSCH regarding the merits and testing of a regulator controlled dynamo. | 31th Mar 1932 | Box 60 \ 4 Scan145 | |
| Confirming the decision not to proceed further with the Marchal Dynamo matter. | 2nd Apr 1932 | Box 60 \ 4 Scan146 | |
| Letter from Bosch Limited responding to a query regarding their catalogue and providing a quotation. | 4th Apr 1932 | Box 60 \ 4 Scan147 | |
| Copy of a quotation from Bosch Limited for switchboards and foot switches. | 4th Apr 1932 | Box 60 \ 4 Scan148 | |
| Letter from C.A.V - BOSCH discussing the supply of a DBR Dynamo for testing. | 5th Apr 1932 | Box 60 \ 4 Scan149 | |
| Investigation into the late cutting in of 20/25 dynamos. | 20th Apr 1932 | Box 60 \ 4 Scan150 | |
| Performance figures related to field resistance and preventing battery over-charging. | 20th Apr 1932 | Box 60 \ 4 Scan151 | |
| Issues with the 20/25 HP dynamo output, cutting-in speed, and half-charge scheme. | 22th Apr 1932 | Box 60 \ 4 Scan152 | |
| Unsatisfactory late cutting-in performance of 20/25 HP dynamos. | 26th Apr 1932 | Box 60 \ 4 Scan153 | |
| Difficulties and limitations of increasing the dynamo output on a 20/25 HP chassis. | 25th Apr 1932 | Box 60 \ 4 Scan154 | |
| Testing of a modified armature to address issues with full night running conditions. | 25th Apr 1932 | Box 60 \ 4 Scan155 | |
| Late cutting-in issue and performance of the 20/25 Dynamo. | 26th Apr 1932 | Box 60 \ 4 Scan156 | |
| Evaluation report on a C.A.V.-Bosch shunt wound dynamo and regulator unit. | 27th Apr 1932 | Box 60 \ 4 Scan157 | |
| The output performance tests of a machine and its regulator. | 27th Apr 1932 | Box 60 \ 4 Scan158 | |
| Effect of reducing field resistance on 20/25 dynamos. | 1st Apr 1932 | Box 60 \ 4 Scan159 | |
| The production status of an experimental half-charge dynamo. | 29th Apr 1932 | Box 60 \ 4 Scan160 | |
| Fitting of a large Bosch regulated dynamo from chassis 19-EX to Experimental Chassis 20-EX for road testing. | 6th May 1932 | Box 60 \ 4 Scan161 | |
| Request for particulars and catalogues of the M.C.L. constant current dynamo and control system. | 1st Jul 1932 | Box 60 \ 4 Scan162 | |
| Request to replace a Scintilla dynamo and regulator with a Bosch unit on vehicle 19-G-IV. | 6th Sep 1932 | Box 60 \ 4 Scan163 | |
| Request to Lucas in Birmingham for a drawing of a shunt dynamo. | 16th Sep 1932 | Box 60 \ 4 Scan164 | |
| Letter to C.A.V.-Bosch Ltd to discuss the results of testing B.2 regulators before production. | 25th Jan 1933 | Box 60 \ 4 Scan165 | |
| Design of the Peregrine Dynamo Drive, reducing its speed and simplifying crankcase machining. | 4th Feb 1933 | Box 60 \ 4 Scan166 | |
| Letter to C.A.V. - Bosch Ltd. to arrange a discussion about C.A.V. Regulators. | 16th Feb 1933 | Box 60 \ 4 Scan167 | |
| Letter from C.A.V-Bosch Ltd. regarding regulators and forwarding the matter to Joseph Lucas Ltd. | 18th Feb 1933 | Box 60 \ 4 Scan168 | |
| Use of different carbon brushes and control systems for dynamos. | 1st Mar 1933 | Box 60 \ 4 Scan169 | |
| The output and temperature limits of spigot-mounted dynamos, including a table of temperature rises under test conditions. | 2nd Mar 1933 | Box 60 \ 4 Scan170 | |
| Analysis of dynamo temperature rise under different mounting conditions, discussing heat-related failures and cooling considerations. | 2nd Mar 1933 | Box 60 \ 4 Scan171 | |
| Dynamo cooling and potential improvements by altering its mounting and position. | 2nd Mar 1933 | Box 60 \ 4 Scan172 | |
| Inquiry sent to C.A.V. Bosch Ltd. regarding the reliability of their vibrator control units for dynamos. | 10th Mar 1933 | Box 60 \ 4 Scan173 | |
| Letter placing an order for three C.A.V. Bosch type B2H1 voltage regulators with specific performance requirements. | 13th Mar 1933 | Box 60 \ 4 Scan174 | |
| Rattle in the dynamo drive and the potential design of a damped spring drive for Peregrine and Bentley models. | 29th Mar 1933 | Box 60 \ 4 Scan175 | |
| Endurance tests of Lucas and Bosch vibrator controlled dynamos. | 2nd May 1933 | Box 60 \ 4 Scan176 | |
| Sectioned Delco-Remy dynamo commutator sent for inspection. | 2nd May 1933 | Box 60 \ 4 Scan177 | |
| Suitability of a sample Delco Remy Commutator for reproduction. | 3rd May 1933 | Box 60 \ 4 Scan178 | |
| Request to check the dynamo and battery circuit connections on a Blue Bentley 3.B.IV due to an intermittent charging fault. | 26th Jun 1933 | Box 60 \ 4 Scan179 | |
| Letter to Joseph Lucas Research Laboratory comparing dynamo performance and inviting a design review. | 10th Jul 1934 | Box 60 \ 4 Scan180 | |
| Letter from Joseph Lucas Ltd. regarding a comparison of Rolls Royce and Lucas dynamos. | 11th Jul 1934 | Box 60 \ 4 Scan181 | |
| Experiment with stamped slotted armature plates for the Bensport Dynamo to reduce high-speed temperatures. | 12th Jul 1933 | Box 60 \ 4 Scan182 | |
| The despatch of one R.R. 20/25 dynamo and one Lucas C5H dynamo. | 12th Jul 1934 | Box 60 \ 4 Scan183 | |
| Request for the repair of a Bensport dynamo's tachometer drive due to stripped sun wheel teeth. | 13th Jul 1933 | Box 60 \ 4 Scan184 | |
| Dynamo commutation issues, specifically the development of flats on the commutator due to armature winding design. | 29th Sep 1933 | Box 60 \ 4 Scan185 | |
| Proposal for two alternative winding schemes for a commutator, comparing a dummy coil design against a Bosch-style winding. | 29th Sep 1933 | Box 60 \ 4 Scan186 | |
| Improving the lubrication and oiling point for the dynamo rear bearing on the 40/50HP chassis. | 24th Oct 1933 | Box 60 \ 4 Scan187 | |
| Lubrication of dynamo rear bearings, specifically addressing failures on the 20/25 model. | 26th Oct 1933 | Box 60 \ 4 Scan188 | |
| Recommendation to cease purchasing Baldwin's stamped armature plates due to poor electrical quality compared to those from Sankey's. | 2nd Nov 1933 | Box 60 \ 4 Scan189 | |
| Letter to Joseph Sankey & Sons Ltd. regarding the testing of dynamo armatures and a proposed meeting. | 9th Nov 1933 | Box 60 \ 4 Scan190 | |
| Letter from Joseph Sankey & Sons, Ltd. confirming a meeting with their Mr. Richmond. | 10th Nov 1933 | Box 60 \ 4 Scan191 | |
| Letter from Joseph Sankey & Sons, Ltd. discussing the suitability of 'Stalloy' Armature Laminations and suggesting an alternative material. | 14th Nov 1933 | Box 60 \ 4 Scan192 | |
| Letter from Joseph Sankey & Sons discussing the manufacture of cores, bars, and laminations. | 14th Nov 1933 | Box 60 \ 4 Scan193 | |
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