| Description | Date | Identifier | |
| List of engine component schemes and modifications, with their respective reference numbers. | 18th Nov 1933 | Box 54 \ 4 Scan126 | |
| Revised specification for a Kestrel FS 6 Cylinder Unit No.1 regarding the remachining of exhaust valves. | 25th Nov 1933 | Box 54 \ 4 Scan127 | |
| Specification revision for a Kestrel FS. 6 Cylinder Unit No.1, detailing changes to the exhaust valves. | 25th Nov 1933 | Box 54 \ 4 Scan128 | |
| Specification revision for a Kestrel FS 6 Cylinder Unit No.1, detailing removed and refitted parts. | 25th Nov 1933 | Box 54 \ 4 Scan129 | |
| Specification revision for Kestrel FS. 6 Cylinder Unit No.1, detailing new parts fitted. | 1st Feb 1934 | Box 54 \ 4 Scan130 | |
| List of parts and replacements for various engine components on a Kestrel 6 Cylinder No. 2 Unit. | 1st Feb 1934 | Box 54 \ 4 Scan131 | |
| List of engine components and specifications for a Kestrel 6 Cylinder No.2 Unit. | 1st Feb 1934 | Box 54 \ 4 Scan132 | |
| Record of component modifications and replacements for a Kestrel 6 Cylinder No. 2 Unit. | 1st Feb 1934 | Box 54 \ 4 Scan133 | |
| Specification revision for a Kestrel FS. 6 Cylinder No.1 engine, detailing magneto replacement. | 1st Feb 1934 | Box 54 \ 4 Scan134 | |
| Specification revision for a Kestrel FS. 6 Cylinder No.1 engine, detailing a replacement magneto driving gear. | 1st Feb 1934 | Box 54 \ 4 Scan135 | |
| Specification revision for a Kestrel FS.6 Cylinder No.1, detailing changes to the piston. | 1st Feb 1934 | Box 54 \ 4 Scan136 | |
| Specification revision for a Kestrel FS. 6 Cylinder No.1 engine. | 1st Feb 1934 | Box 54 \ 4 Scan137 | |
| Revised specification for a Kestrel FS 6 Cylinder Unit No.1, detailing changes to valves and springs. | 1st Feb 1934 | Box 54 \ 4 Scan138 | |
| Revised specification for the Kestrel FS. 6 Cylinder No.1 engine, detailing a supercharger rotor modification. | 5th Feb 1934 | Box 54 \ 4 Scan139 | |
| Specification revision for the Kestrel FS 6 Cylinder No.1 engine. | 14th Mar 1934 | Box 54 \ 4 Scan140 | |
| Revised specification sheet detailing changes to connecting rods and pistons. | 14th Mar 1934 | Box 54 \ 4 Scan141 | |
| Specification revision for Kestrel FS. 6 Cylinder No.1 engine, detailing part changes. | 28th Apr 1934 | Box 54 \ 4 Scan142 | |
| Specification revision for a Kestrel FS.6 Cylinder No.1 engine detailing replacement magnetos. | 30th Apr 1934 | Box 54 \ 4 Scan143 | |
| Revised specification document for the Kestrel MS. 6 Cylinder Unit No.1 engine. | 30th Apr 1934 | Box 54 \ 4 Scan144 | |
| Specification document detailing revisions and replacement parts for a supercharger. | 30th Apr 1934 | Box 54 \ 4 Scan145 | |
| Specification sheet for Kestrel FS 6 cylinder Unit No. 2. | 30th May 1933 | Box 54 \ 4 Scan146 | |
| Parts list specifying modifications for pistons, connecting rods, valves, and other engine assemblies. | 30th May 1933 | Box 54 \ 4 Scan147 | |
| List of parts for engine components including cylinders, camshaft, water pump, and oil pump. | 30th May 1933 | Box 54 \ 4 Scan148 | |
| List of new and complete engine components with their corresponding part numbers. | 30th May 1933 | Box 54 \ 4 Scan149 | |
| Parts list for Water Connections, Carburetter, and Controls for a K.119 Engine. | 30th May 1933 | Box 54 \ 4 Scan150 | |
| List of parts and modifications for a K.119 engine, including gun gear, ignition wires, and a supercharger. | 30th May 1933 | Box 54 \ 4 Scan151 | |
| Specification revision for a Kestrel FS. 6 Cylinder Unit No. 2, detailing a modification to the driving flange. | 2nd Jun 1933 | Box 54 \ 4 Scan152 | |
| Specification revision for the Kestrel F.S.6 Cylinder Unit No.2, detailing changes to valves, fittings, and cylinders. | 28th Jul 1933 | Box 54 \ 4 Scan153 | |
| Specification revision for the Kestrel FS.6 Cylinder Unit No.2, detailing supercharger modifications. | 2nd Aug 1933 | Box 54 \ 4 Scan154 | |
| Specification revision for a Kestrel FS 6 Cylinder No.2 Unit, detailing changes to crankcase bearings and piston rings. | 11th Aug 1933 | Box 54 \ 4 Scan155 | |
| Specification revision document comparing previous and revised parts for valves, fittings, and cylinders. | 11th Aug 1933 | Box 54 \ 4 Scan156 | |
| Specification revision for a Kestrel FS.6 Cylinder No.2 Unit, detailing parts changes. | 15th Sep 1933 | Box 54 \ 4 Scan157 | |
| Specification revisions for a Kestrel FS. 6 Cylinder Unit No.2, detailing piston and cylinder changes. | 19th Sep 1933 | Box 54 \ 4 Scan158 | |
| Revised specification for the Kestrel F.S. 6 Cylinder Unit No.2. | 27th Sep 1933 | Box 54 \ 4 Scan159 | |
| Specification revision for a Kestrel FS 6 Cylinder Unit No.2, detailing new pistons and gudgeon pins. | 30th Sep 1933 | Box 54 \ 4 Scan160 | |
| Revised specification document for the Kestrel FS 6 Cylinder Unit No.2, detailing component changes. | 18th Oct 1933 | Box 54 \ 4 Scan161 | |
| Specification revision for Camshaft Drives, comparing previous and revised versions. | 18th Oct 1933 | Box 54 \ 4 Scan162 | |
| Specification revision for the Kestrel FS 6 Cylinder Unit No.2 engine. | 27th Oct 1933 | Box 54 \ 4 Scan163 | |
| Specification revision document detailing changes to valves and fittings. | 27th Oct 1933 | Box 54 \ 4 Scan164 | |
| Specification revision document for a Kestrel FS 6 Cylinder Unit No.2, detailing changes to cylinders and valves. | 30th Oct 1933 | Box 54 \ 4 Scan165 | |
| Specification revision for a Kestrel FS 6 Cylinder Unit No.2, detailing changes to cylinders, valves, and fittings. | 1st Nov 1933 | Box 54 \ 4 Scan166 | |
| Revised specification for a Kestrel F.S. 6 Cylinder Unit No.2, detailing the refitting of parts from Unit No.1. | 9th Nov 1933 | Box 54 \ 4 Scan167 | |
| Specification list of engine components with their associated part and reference numbers. | 9th Nov 1933 | Box 54 \ 4 Scan168 | |
| Specification revision for Kestrel-FS-6 Cylinder Unit No.2, detailing changes between previous and revised parts. | 16th Nov 1933 | Box 54 \ 4 Scan169 | |
| Specification revision for a Kestrel FS.6 Cylinder Unit No.2 detailing parts removed and fitted to Unit No.1. | 27th Nov 1933 | Box 54 \ 4 Scan170 | |
| Revised specification for the Kestrel FS 6-cylinder unit No. 2, listing components and associated part numbers. | 27th Nov 1933 | Box 54 \ 4 Scan171 | |
| List of engine component modifications and part numbers. | 27th Nov 1933 | Box 54 \ 4 Scan172 | |
| List of valve, fitting, and cylinder parts for a Kestrel 6 Cylinder No.1 unit, including replacements after a failure. | 27th Nov 1933 | Box 54 \ 4 Scan173 | |
| Modification record for a Direct Drive LOP, detailing removed and newly fitted parts. | 27th Nov 1933 | Box 54 \ 4 Scan174 | |
| Specification revision for a Kestrel FS 6 Cylinder Unit No.2, comparing previous and revised parts. | 27th Nov 1933 | Box 54 \ 4 Scan175 | |
| Specification revision for the Kestrel F.S. 6 Cylinder Unit No.2, detailing changes to the exhaust valves. | 29th Nov 1933 | Box 54 \ 4 Scan176 | |
| Specification revision for Kestrel FS.6 Cylinder Unit No.2, comparing previous and revised specifications. | 2nd Dec 1933 | Box 54 \ 4 Scan177 | |
| Specification revision document for Kestrel FS.6 Cylinder No.2, detailing component changes. | 7th Dec 1933 | Box 54 \ 4 Scan178 | |
| Revised specification for the Kestrel FS 6 Cylinder No.2 unit, detailing changes to piston components. | 12th Dec 1933 | Box 54 \ 4 Scan179 | |
| Specification revision for a Kestrel FS 6 Cylinder No.2 engine, detailing the replacement of a lateral bolt on the test bed. | 1st Feb 1934 | Box 54 \ 4 Scan180 | |
| Revised specification for the Kestrel FS. 6 Cylinder No.2 engine, listing parts removed and refitted. | 1st Feb 1934 | Box 54 \ 4 Scan181 | |
| Specification revision for the Kestrel F.S. 6 Cylinder Unit No. I engine. | 3rd Aug 1934 | Box 54 \ 4 Scan182 | |
| Seeking an opinion on the use of Ebonite Separators for battery plates. | 15th Oct 1919 | Box 54 \ 5 Scan001 | |
| Responding to a query about the use of ebonite versus wooden battery plate separators. | 20th Oct 1919 | Box 54 \ 5 Scan002 | |
| Letter from Peto & Radford concerning the supply of more durable Ebonite Separators for future batteries. | 1st Dec 1923 | Box 54 \ 5 Scan003 | |
| Forwarding a letter regarding the use of ebonite separators for P & R batteries. | 3rd Dec 1923 | Box 54 \ 5 Scan004 | |
| Letter from accumulator manufacturers Peto & Radford, regarding a request for examples of chafed Ebonite Sheets. | 17th Apr 1925 | Box 54 \ 5 Scan005 | |
| Extract of a letter to Peto & Radford regarding the thickness of ebonite separators for batteries. | 27th Apr 1925 | Box 54 \ 5 Scan006 | |
| Letter from a supplier discussing the feasibility and cost of increasing the thickness of ebonite separators. | 1st May 1925 | Box 54 \ 5 Scan007 | |
| Letter to Messrs. Peto & Radford discussing the required thickness of battery separators based on wear measurements. | 2nd May 1925 | Box 54 \ 5 Scan008 | |
| Letter regarding samples of an ebonite battery separator from the Exide Co. and a proposal for a different perforation method. | 7th May 1925 | Box 54 \ 5 Scan009 | |
| Letter from Peto & Radford regarding samples of ebonite separators. | 7th May 1925 | Box 54 \ 5 Scan010 | |
| Letter from accumulator manufacturers Peto & Radford concerning a report and the examination of batteries. | 7th May 1925 | Box 54 \ 5 Scan011 | |
| Letter from P&R Accumulators discussing ebonite separator samples and comparing them to an Exide equivalent. | 4th May 1925 | Box 54 \ 5 Scan012 | |
| Letter from accumulator manufacturer Peto & Radford discussing the specifications and pricing of ebonite separation material. | 26th May 1925 | Box 54 \ 5 Scan013 | |
| Letter discussing the thickness and cost of ebonite separators for batteries. | 27th May 1925 | Box 54 \ 5 Scan014 | |
| Letter discussing the failure of experimental batteries with and without ebonite separators. | 29th May 1925 | Box 54 \ 5 Scan015 | |
| Letter from accumulator manufacturers Peto & Radford concerning samples of different material thicknesses. | 29th May 1925 | Box 54 \ 5 Scan016 | |
| Letter from Pritchett & Gold and E.P.S. Company Ltd. regarding samples of perforated ebonite separators. | 2nd Jun 1925 | Box 54 \ 5 Scan017 | |
| Investigation of sample ebonite battery plate separators and discussion of new specifications with a supplier. | 10th Jun 1925 | Box 54 \ 5 Scan018 | |
| Letter to Peto & Radford regarding an investigation into the thickness and perforation of ebonite battery separator samples. | 17th Jun 1925 | Box 54 \ 5 Scan019 | |
| Letter to Messrs. P & R regarding the specifications for perforated ebonite separators. | 20th Jun 1925 | Box 54 \ 5 Scan020 | |
| Letter from accumulator manufacturers Peto & Radford regarding ebonite separators, suggesting a meeting to resolve the issue. | 20th Jun 1925 | Box 54 \ 5 Scan021 | |
| Letter to Messrs. Peto & Radford regarding the question of ebonite separators and postponing a visit. | 25th Jun 1925 | Box 54 \ 5 Scan022 | |
| Letter from Peto & Radford regarding a proposed works visit to discuss ebonite separators. | 26th Jun 1925 | Box 54 \ 5 Scan023 | |
| Letter from Peto & Radford regarding a proposed appointment to discuss ebonite separators. | 9th Jul 1925 | Box 54 \ 5 Scan024 | |
| Letter to Messrs. Peto & Radford arranging a visit to discuss ebonite separators. | 10th Jul 1925 | Box 54 \ 5 Scan025 | |
| Letter from Peto & Radford regarding the arrangement of a meeting with Mr. Fowler-Clark. | 13th Jul 1925 | Box 54 \ 5 Scan026 | |
| Letter to Messrs. Peto & Radford concerning the thickness of perforated ebonite separator samples. | 17th Jul 1925 | Box 54 \ 5 Scan027 | |
| Letter from accumulator manufacturers Peto & Radford regarding separators and ebonite suppliers. | 20th Jul 1925 | Box 54 \ 5 Scan028 | |
| Letter from Peto & Radford concerning the increased thickness and cost of ebonite battery separators. | 25th Aug 1925 | Box 54 \ 5 Scan029 | |
| Letter from P & R Co. discussing costs for tools and a surcharge for thicker battery separators. | 26th Aug 1925 | Box 54 \ 5 Scan030 | |
| Letter acknowledging receipt of correspondence regarding ebonite separators. | 26th Aug 1925 | Box 54 \ 5 Scan031 | |
| Proposal to increase the thickness of ebonite separators for 40/50 and 20 HP batteries to improve their lifespan. | 28th Aug 1925 | Box 54 \ 5 Scan032 | |
| The thickness of ebonite separators in Exide batteries and comparisons with those from P & R. | 28th Aug 1925 | Box 54 \ 5 Scan033 | |
| Follow-up query regarding thicker ebonite separators for standard 20 HP & 40/50 HP chassis batteries. | 21th Sep 1925 | Box 54 \ 5 Scan034 | |
| The production of batteries with thicker separators by Peto & Radford. | 21th Sep 1925 | Box 54 \ 5 Scan035 | |
| Letter from a supplier regarding a new type of thicker ebonite separator for approval. | 12th Oct 1925 | Box 54 \ 5 Scan036 | |
| Letter of approval for new thicker ebonite separators to be used in batteries for the chassis. | 16th Oct 1925 | Box 54 \ 5 Scan037 | |
| Calculations comparing the hole area of various ebonite separator samples. | 16th Oct 1925 | Box 54 \ 5 Scan038 | |
| Letter from Peto & Radford regarding a drawing and the production of a thicker separator for batteries. | 19th Oct 1925 | Box 54 \ 5 Scan039 | |
| Query about the incorporation of thicker Ebonite Separators from Messrs. Peto & Radford. | 23th Oct 1925 | Box 54 \ 5 Scan040 | |
| Confirming no technical query prevents the inclusion of thicker ebonite separators in P & R. batteries. | 27th Oct 1925 | Box 54 \ 5 Scan041 | |
| Performance and potential use of threaded rubber separators for batteries. | 5th Jan 1926 | Box 54 \ 5 Scan042 | |
| C.A.V. battery failure and a proposal to test threaded rubber separators for comparative purposes. | 5th Jan 1926 | Box 54 \ 5 Scan043 | |
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