| Description | Date | Identifier | |
| Blueprint of an Aerolite Piston with multiple views and dimensions. | 25th Oct 1933 | Box 86 \ 2 scan0130 | |
| Record of piston measurements taken before and after a 6,000-mile endurance test. | 25th Oct 1933 | Box 86 \ 2 scan0131 | |
| Letter from The Light Production Co. Ltd. discussing the performance of Aerolite Pistons in relation to horsepower and oil temperature. | 6th Nov 1933 | Box 86 \ 2 scan0132 | |
| Page two of a letter from The Light Production Co. Ltd. regarding the properties of alloys for pistons. | 6th Nov 1933 | Box 86 \ 2 scan0133 | |
| Comparison table of physical properties for materials RR.53 and Aerolite 122. | 3rd Nov 1933 | Box 86 \ 2 scan0134 | |
| Comparative table of weights for R.R. and 'Aerolite' Bentley pistons and their components. | 3rd Nov 1933 | Box 86 \ 2 scan0135 | |
| Telegram to The Light Production Co. Ltd. regarding a piston and valve failure and a request for replacements. | 6th Nov 1933 | Box 86 \ 2 scan0136 | |
| Order for Aerolite and RR.53 alloy pistons for Bentley tests. | 7th Nov 1933 | Box 86 \ 2 scan0137 | |
| Letter to The Light Production Co. Ltd. confirming an order for pistons and requesting the urgent delivery of a further six for endurance testing. | 7th Nov 1933 | Box 86 \ 2 scan0138 | |
| Requesting the despatch of 6 gudgeon pins to the Light Production Co. to be fitted to a set of Aerolite pistons. | 8th Nov 1933 | Box 86 \ 2 scan0139 | |
| The testing and failure analysis of Aerolite pistons, detailing two separate tests and modifications made between them. | 8th Nov 1933 | Box 86 \ 2 scan0140 | |
| Summary of test results for the Aerolite piston, noting its durability, power increase, and susceptibility to cold knocks. | 8th Nov 1933 | Box 86 \ 2 scan0141 | |
| Performance graph comparing different Aerolite pistons against standard split skirt pistons. | 6th Nov 1933 | Box 86 \ 2 scan0142 | |
| Letter from The Light Production Co. Ltd. regarding the dispatch of replacement pistons and further orders. | 9th Nov 1933 | Box 86 \ 2 scan0143 | |
| Results of piston testing, comparing different types, their performance, and failures. | 10th Nov 1933 | Box 86 \ 2 scan0144 | |
| Test-bed work log comparing the performance and failure points of six different piston designs. | 27th Oct 1933 | Box 86 \ 2 scan0145 | |
| Test bed work chart detailing piston development and failure analysis for the 3 1/2 Litre Bentley engine. | 6th Nov 1933 | Box 86 \ 2 scan0146 | |
| Chart detailing piston development and failure analysis for a 3½ Litre Bentley engine. | 2nd Nov 1933 | Box 86 \ 2 scan0147 | |
| Chart tracking the road work development and testing of different pistons for the 3 1/2 Litre Bentley. | 2nd Nov 1933 | Box 86 \ 2 scan0148 | |
| Negative impact of a chilling operation during piston heat treatment on engine life. | 14th Nov 1933 | Box 86 \ 2 scan0149 | |
| Letter to a supplier regarding the supply and design modification of Aerolite pistons and piston rings. | 14th Nov 1933 | Box 86 \ 2 scan0150 | |
| Design changes for new Bentley pistons, LeC.3698 and 3699. | 14th Nov 1933 | Box 86 \ 2 scan0151 | |
| Inspection and chalk testing of pistons for a 10,000 miles test. | 16th Nov 1933 | Box 86 \ 2 scan0152 | |
| Letter from The Light Production Co. Ltd. regarding the supply of RR.53 alloy pistons and a query about reducing major axis clearance. | 16th Nov 1933 | Box 86 \ 2 scan0153 | |
| Letter discussing the optimal arrangement of scraper rings for RR.53 pistons. | 18th Nov 1933 | Box 86 \ 2 scan0154 | |
| Letter to The Light Production Co. Ltd. discussing piston clearances and cold knocking. | 18th Nov 1933 | Box 86 \ 2 scan0155 | |
| Invoice from The Light Production Co. for slotted scraper rings for Aerolite pistons. | 18th Nov 1933 | Box 86 \ 2 scan0156 | |
| Piston rings left by the Light Production Co's representative, authorizing an invoice to be cleared. | 20th Nov 1933 | Box 86 \ 2 scan0157 | |
| Letter from a supplier discussing manufacturing issues with RR.53 pistons. | 22th Nov 1933 | Box 86 \ 2 scan0158 | |
| Letter from The Light Production Co. Ltd. regarding a delay in delivering pistons for RR.53, with a handwritten instruction. | 23th Nov 1933 | Box 86 \ 2 scan0159 | |
| Letter to The Light Production Co. Ltd. postponing a test of reduced clearances on pistons. | 23th Nov 1933 | Box 86 \ 2 scan0160 | |
| The chalk testing of B3 and B6 Bentley pistons for cracks. | 22th Nov 1933 | Box 86 \ 2 scan0161 | |
| Report comparing low temperature treatment versus quenching from the die for Bentley pistons to determine methods for increasing longevity. | 23th Nov 1933 | Box 86 \ 2 scan0162 | |
| Diagram showing cracks found in the webs and bosses of various pistons. | 21th Nov 1933 | Box 86 \ 2 scan0163 | |
| Results of heat treatment tests on Bentley pistons. | 24th Nov 1933 | Box 86 \ 2 scan0164 | |
| Experiences with Bentley and 20/25 pistons, focusing on issues with castings and the benefits of ageing. | 28th Nov 1933 | Box 86 \ 2 scan0165 | |
| Physical changes in 20/25 pistons due to heat treatment during engine operation, and the importance of a leisurely running-in schedule to prevent stress cracks. | 28th Nov 1933 | Box 86 \ 2 scan0166 | |
| Letter to The Light Production Co. Ltd. enquiring about the progress of pistons made from R.R. alloy. | 2nd Dec 1933 | Box 86 \ 2 scan0167 | |
| Letter from The Light Production Co. Ltd. regarding castings that have completed heat treatment and are ready for machining. | 4th Dec 1933 | Box 86 \ 2 scan0168 | |
| Letter from The Automotive Engineering Co Ltd regarding a set of experimental pistons and requesting cylinder bore dimensions. | 8th Dec 1933 | Box 86 \ 2 scan0169 | |
| Letter to a supplier clarifying a piston order and providing Bentley car cylinder bore dimensions. | 11th Dec 1933 | Box 86 \ 2 scan0170 | |
| Substandard batch of porous Aerolite Pistons, questioning if the material has been altered from the standard RR.50. | 11th Dec 1933 | Box 86 \ 2 scan0171 | |
| Letter from The Automotive Engineering Co Ltd regarding the supply of B.H.B. Pistons for a running test. | 12th Dec 1933 | Box 86 \ 2 scan0172 | |
| Letter to The Automotive Engineering Co. Ltd. deferring the testing of pistons. | 19th Dec 1933 | Box 86 \ 2 scan0173 | |
| Table of dimensions for Aero-Lite pistons from the second delivery, with diagrams showing measurement points. | 2nd Nov 1933 | Box 86 \ 2 scan0174 | |
| Issues and proposed modifications for the Bentley exhaust suspension. | 20th Dec 1933 | Box 86 \ 2 scan0175 | |
| Letter from The Automotive Engineering Co Ltd regarding the near completion and forwarding of B.H.B. Pistons for testing. | 21th Dec 1933 | Box 86 \ 2 scan0176 | |
| Letter to The Automotive Engineering Co. Ltd. acknowledging receipt of pistons for testing. | 27th Dec 1933 | Box 86 \ 2 scan0177 | |
| Standardisation of parts for Bentley pistons, defining heat treatment and hardness to overcome previous failures. | 20th Dec 1933 | Box 86 \ 2 scan0178 | |
| Alternative piston designs and power increases for Bentley vehicles. | 24th Jan 1934 | Box 86 \ 2 scan0179 | |
| Letter from The Light Production Co. Ltd. requesting feedback on experimental Aerolite pistons made for test purposes in the Bentley engine. | 12th Mar 1934 | Box 86 \ 2 scan0180 | |
| Letter to The Light Production Co. Ltd. regarding the ongoing testing of Aerolite Pistons in experimental cars. | 13th Mar 1934 | Box 86 \ 2 scan0181 | |
| Letter to The Light Production Co. Ltd. regarding the testing and performance of different alloy pistons. | 19th Apr 1934 | Box 86 \ 2 scan0182 | |
| Piston technology, referencing Cadillac's use of alumilite treatment and proposing tests on aerolite pistons. | 19th Apr 1934 | Box 86 \ 2 scan0183 | |
| Results of a 10,000-mile test on Aerolite pistons and a proposal for standardisation. | 19th Apr 1934 | Box 86 \ 2 scan0184 | |
| Suggestion to test a set of parts on a car for ordinary running, distinct from test mileage. | 28th Apr 1934 | Box 86 \ 2 scan0185 | |
| The advantages and test results of Aerolite pistons. | 28th Apr 1934 | Box 86 \ 2 scan0186 | |
| Piston condition after testing and a summary of the advantages and future plans for Aerolite pistons. | 28th Apr 1934 | Box 86 \ 2 scan0187 | |
| Technical report on the advantages and testing of Aerolite pistons. | 30th Apr 1934 | Box 86 \ 2 scan0188 | |
| Letter from The Light Production Co. Ltd. regarding the production, testing, and treatment of piston sets. | 26th Apr 1934 | Box 86 \ 2 scan0189 | |
| Request to fit standard pistons to engine or component 4-B.IV. | 26th Apr 1934 | Box 86 \ 2 scan0190 | |
| To place an order for two sets of Aerolite Pistons from Light Production Co. Ltd., with one old set being returned for credit. | 27th Apr 1934 | Box 86 \ 2 scan0191 | |
| Urgent request to make a Piston Ring Gauge for checking Bentley Piston Rings to improve oil consumption. | 27th Apr 1934 | Box 86 \ 2 scan0192 | |
| Letter to The Light Production Co. Ltd. concerning drawings and the testing of Aerolite pistons in RR.53 alloy. | 2nd May 1934 | Box 86 \ 2 scan0193 | |
| Correspondence regarding an order for Aerolite Pistons for a Bentley engine, including the 'Alumilite' process and delivery schedule. | 4th May 1934 | Box 86 \ 2 scan0194 | |
| Letter to The Light Production Co. Ltd. regarding the despatch of 6 Bentley pistons for examination and proposed modifications. | 5th May 1934 | Box 86 \ 2 scan0195 | |
| Power output graph comparing two engine configurations for the 3½ Litre Bentley. | 12th Feb 1933 | Box 86 \ 2 scan0196 | |
| Experimental department report on the effect of reduced piston friction for Bentley, comparing split skirt and non-split skirt pistons. | 14th May 1934 | Box 86 \ 2 scan0197 | |
| Trial of semi-split pistons as an intermediate step to their own design, noting a preference for Aerolite pistons. | 12th May 1934 | Box 86 \ 2 scan0198 | |
| Power experiments investigating the effect of reduced piston friction by testing modified pistons. | 14th May 1934 | Box 86 \ 2 scan0199 | |
| Piston performance, discussing friction, expansion, clearances, and test results for semi-split and Aerolite pistons. | 14th May 1934 | Box 86 \ 2 scan0200 | |
| Letter from The Light Production Co. Ltd. to the Experimental Dept. regarding modifications to six pistons from a Bentley car. | 14th May 1934 | Box 86 \ 2 scan0201 | |
| Letter from The Light Production Co. Ltd. concerning the return or crediting of pistons. | 14th May 1934 | Box 86 \ 2 scan0202 | |
| Technical drawing of an Aerolite Mark V compensating piston. | 16th May 1934 | Box 86 \ 2 scan0203 | |
| Letter confirming collection arrangements for a set of Aerolite Pistons in R.R.53, with a contingency for potential casting defects. | 16th May 1934 | Box 86 \ 2 scan0204 | |
| Letter to The Light Production Co. Ltd. requesting a set of Aerolite Pistons without alumiliting. | 14th May 1934 | Box 86 \ 2 scan0205 | |
| Letter to The Light Production Co. Ltd. concerning piston grinding dimensions and the replacement of pistons. | 15th May 1934 | Box 86 \ 2 scan0206 | |
| Telegram confirming arrangements to collect pistons at Greencoat Place. | 18th May 1934 | Box 86 \ 2 scan0207 | |
| Letter from The Light Production Co. Ltd. regarding the despatch of an order for Aerolite Pistons. | 16th May 1934 | Box 86 \ 2 scan0208 | |
| Request to order two sets of Scraper Rings with a specific width for Aerolite Pistons. | 30th May 1934 | Box 86 \ 2 scan0209 | |
| Request to The Light Production Co. Ltd. for two sets of scraper rings for Aerolite Pistons. | 30th May 1934 | Box 86 \ 2 scan0210 | |
| Request to obtain a cost figure for a dozen sets of Aerolite pistons from the Light Production Co. | 31th May 1934 | Box 86 \ 2 scan0211 | |
| Letter to The Light Production Co. Ltd. regarding disappointment with Aluminited Piston castings in RR.50 alloy. | 31th May 1934 | Box 86 \ 2 scan0212 | |
| Poor quality of Aerolite Pistons and arrangements for new castings. | 6th Jun 1934 | Box 86 \ 2 scan0213 | |
| Letter from The Light Production Co. Ltd. regarding the dispatch of an Aerolite Piston in L22 alloy for testing. | 7th Jun 1934 | Box 86 \ 2 scan0214 | |
| Advice note from The Light Production Co. Ltd. regarding an Aerolite Piston. | 7th Jun 1934 | Box 86 \ 2 scan0215 | |
| Letter to The Light Production Co. Ltd. concerning a preliminary run and dimension comparison of new pistons. | 16th Jun 1934 | Box 86 \ 2 scan0216 | |
| Communication regarding piston dimensions and the production of new castings. | 16th Jun 1934 | Box 86 \ 2 scan0217 | |
| Measurement data for Aerolite pistons and cylinder bores after a 12-hour conning process for a Bentley No. 7 engine. | 16th Jun 1934 | Box 86 \ 2 scan0218 | |
| New design for Bentley piston pin buttons for chassis B.126-AH. | 21th Jun 1934 | Box 86 \ 2 scan0219 | |
| Letter from The Light Production Co. Ltd. regarding piston design, clearances, and performance characteristics. | 21th Jun 1934 | Box 86 \ 2 scan0220 | |
| Letter from a supplier discussing piston dimensions, casting production, and pricing. | 22th Jun 1934 | Box 86 \ 2 scan0221 | |
| Letter to The Light Production Co. Ltd. regarding the slow progress of a job concerning aluminiting. | 22th Jun 1934 | Box 86 \ 2 scan0222 | |
| Power comparison chart for modified Aerolite pistons and various honed bore dimensions. | 4th Jun 1934 | Box 86 \ 2 scan0223 | |
| Letter to The Light Production Co. Ltd. requesting the urgent production of three sets of Bentley Aerolite pistons. | 25th Jun 1934 | Box 86 \ 2 scan0224 | |
| Order be placed for three sets of Aerolite Pistons. | 25th Jun 1934 | Box 86 \ 2 scan0225 | |
| Letter to The Aerolite Piston Co. Ltd. regarding the aluminiting, testing, and despatch of RR.53 pistons. | 3rd Jul 1934 | Box 86 \ 2 scan0226 | |
| Brief communication to Aerolite Piston Co. anxiously awaiting news on pistons. | 3rd Jul 1934 | Box 86 \ 2 scan0227 | |
| Telegram from Robotham to Brookes requesting an update on Aerolite pistons. | 4th Jul 1934 | Box 86 \ 2 scan0228 | |
| Letter from The Light Production Co. Ltd. regarding the unsuitability of L22 alloy castings and the dispatch of replacement pistons in RR.53. | 4th Jul 1934 | Box 86 \ 2 scan0229 | |
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