| Description | Date | Identifier | |
| Letter to The Light Production Co. Ltd. regarding cracked pistons, gudgeon pins, and cam form testing. | 20th Mar 1935 | Box 87 \ 2 scan0024 | |
| The concluding page of a letter with a reference to an attached sketch. | 20th Mar 1935 | Box 87 \ 2 scan0025 | |
| The modified grinding of E.84546 semi-split pistons for Spectre. | 20th Mar 1935 | Box 87 \ 2 scan0026 | |
| Diagram showing the ovality of a piston contour for modified grinding. | 18th Mar 1936 | Box 87 \ 2 scan0027 | |
| To Roy regarding an attached invoice from the Light Production Co. for six light pistons, and the return of five of them. | 21th Mar 1935 | Box 87 \ 2 scan0028 | |
| Request for two sets of 3 1/4' bore pistons and a follow-up on previously returned cracked pistons. | 25th Mar 1935 | Box 87 \ 2 scan0029 | |
| Letter from The Light Production Co. Ltd. comparing piston specifications for a Bentley model against a C.140 model. | 26th Mar 1935 | Box 87 \ 2 scan0030 | |
| Letter from The Light Production Co. Ltd. regarding the supply and dimensions of pistons for a Bentley. | 28th Mar 1935 | Box 87 \ 2 scan0031 | |
| Letter to The Light Production Co. Ltd. discussing modifications to C.140 pistons for experimental runs. | 28th Mar 1935 | Box 87 \ 2 scan0032 | |
| Letter concerning the selective assembly of gudgeon pins in Aerolite pistons and an instance of a seized piston. | 30th Mar 1935 | Box 87 \ 2 scan0033 | |
| Letter discussing modifications to Piston No. C.140 for an experimental run. | 1st Apr 1935 | Box 87 \ 2 scan0034 | |
| Letter from The Light Production Co. Ltd. discussing piston proportions and comparing Aerolite and Bohlnalite materials. | 2nd Apr 1935 | Box 87 \ 2 scan0035 | |
| Order for modified pistons from the Light Production Co. Ltd. | 2nd Apr 1935 | Box 87 \ 2 scan0036 | |
| Letter from The Light Production Co. Ltd. regarding Aerolite Pistons and arranging a meeting. | 2nd Apr 1935 | Box 87 \ 2 scan0037 | |
| Piston seizure issues on Bentley vehicles and proposing lubrication-based solutions. | 4th Apr 1935 | Box 87 \ 2 scan0038 | |
| Blueprint detailing a modification to an engine connecting rod (con-rod). | 4th Apr 1935 | Box 87 \ 2 scan0039 | |
| Suggestion for extra piston lubrication to prevent seizures on the Bentley and 20/25's models. | 10th Apr 1935 | Box 87 \ 2 scan0040 | |
| The non-existence of piston seizures on the 3 1/2 / 25 Bentley, making increased cylinder wall lubrication unnecessary. | 11th Apr 1935 | Box 87 \ 2 scan0041 | |
| Letter despatching twelve semi-split pistons for grinding, along with a sketch and returned gudgeon pins. | 11th Apr 1935 | Box 87 \ 2 scan0042 | |
| Blueprint of a piston showing a side view with dimensional measurements. | 12th Apr 1935 | Box 87 \ 2 scan0043 | |
| Immediate modification to address piston seizure on Bentley models. | 12th Apr 1935 | Box 87 \ 2 scan0044 | |
| Causes of Bentley piston seizures and comparing lubrication systems across various chassis. | 12th Apr 1935 | Box 87 \ 2 scan0045 | |
| Sheet detailing proposals for oil supply additions and automatic mixture control. | 12th Apr 1935 | Box 87 \ 2 scan0046 | |
| Causes and potential solutions for Bentley piston seizures. | 11th Apr 1935 | Box 87 \ 2 scan0047 | |
| Different methods and issues related to cylinder wall lubrication. | 15th Apr 1935 | Box 87 \ 2 scan0048 | |
| Telegram urgently requesting the delivery of larger Bentley pistons. | 15th Apr 1935 | Box 87 \ 2 scan0049 | |
| Telegram regarding the dispatch of larger Bentley pistons. | 15th Apr 1935 | Box 87 \ 2 scan0050 | |
| Unsuccessful attempts to reproduce piston seizures on a B-23-AE Bentley Chassis. | 15th Apr 1935 | Box 87 \ 2 scan0051 | |
| Investigation into Bentley piston seizures, detailing boiling tests and subsequent modifications to address cooling issues. | 17th Apr 1935 | Box 87 \ 2 scan0052 | |
| Engine seizure tests under cold starting and rich mixture conditions. | 17th Apr 1935 | Box 87 \ 2 scan0053 | |
| Piston seizure tests, comparing standard E.B.1299 pistons with Aerolite pistons. | 17th Apr 1935 | Box 87 \ 2 scan0054 | |
| Analysis of piston seizure causes, including engine boiling and rich fuel mixtures. | 17th Apr 1935 | Box 87 \ 2 scan0055 | |
| Engine running-in procedures and tests to investigate and prevent piston seizure. | 17th Apr 1935 | Box 87 \ 2 scan0056 | |
| Confirming an agreement to introduce a small hole in the connecting rod on Bentley models to prevent piston seizure. | 17th Apr 1935 | Box 87 \ 2 scan0057 | |
| Handover of a set of Aerolite Pistons for a Large Bore Bentley Unit. | 18th Apr 1935 | Box 87 \ 2 scan0058 | |
| Depot sheet detailing a modification to address piston seizures on the Bentley. | 18th Apr 1935 | Box 87 \ 2 scan0059 | |
| Blueprint for a modification to a connecting rod (con-rod). | 18th Apr 1935 | Box 87 \ 2 scan0060 | |
| Weights of piston components for the 3.500 ball engine. | 2nd May 1935 | Box 87 \ 2 scan0061 | |
| Letter to a supplier requesting a dozen modified pistons and enquiring about the delivery timeframe. | 29th May 1935 | Box 87 \ 2 scan0062 | |
| To Roy requesting an order for a dozen more pistons from the Light Production Co. Ltd. | 29th May 1935 | Box 87 \ 2 scan0063 | |
| To Roy requesting an order for 3 sets of pistons from Light Production Co. Ltd. | 27th Jun 1935 | Box 87 \ 2 scan0064 | |
| Letter to The Light Production Co. Ltd. requesting three further sets of pistons with specific dimensions. | 27th Jun 1935 | Box 87 \ 2 scan0065 | |
| Letter from The Light Production Co. Ltd. regarding an order for 3 1/2 inch bore pistons. | 28th Jun 1935 | Box 87 \ 2 scan0066 | |
| Letter to The Light Production Co. Ltd. requesting the supply of 3¼' bore pistons. | 5th Jul 1935 | Box 87 \ 2 scan0067 | |
| Request to order two sets of 3 1/2 inch bore pistons from Light Production Co. Ltd. | 6th Jul 1935 | Box 87 \ 2 scan0068 | |
| Letter to Light Production Co. concerning the progress of standard pistons and a proposal for a new design with a larger gudgeon pin. | 31th Jul 1935 | Box 87 \ 2 scan0069 | |
| Letter from The Light Production Co. Ltd. to Mr. W.A. Robotham regarding a delay in response due to a colleague's annual holiday. | 2nd Aug 1935 | Box 87 \ 2 scan0070 | |
| Letter to The Light Production Co. Ltd. regarding cracked 3 1/4' bore Bentley pistons for examination. | 31th Aug 1935 | Box 87 \ 2 scan0071 | |
| Advice note from The Light Production Co. Ltd. for the dispatch of 32 Mark V Aerolite Pistons. | 3rd Sep 1935 | Box 87 \ 2 scan0072 | |
| Telegram requesting strengthened pistons for an upcoming continental test of a 3 ½' bore engine. | 6th Sep 1935 | Box 87 \ 2 scan0073 | |
| Telegram received by telephone concerning strengthened pistons. | 9th Sep 1935 | Box 87 \ 2 scan0074 | |
| Letter to The Light Production Co. Ltd. providing grinding specifications for E.86632 pistons. | 11th Sep 1935 | Box 87 \ 2 scan0075 | |
| Letter from The Light Production Co. Ltd. concerning the grinding of E.86632 pistons and the posting of a further set of 3 1/2' Bentley Pistons. | 16th Sep 1935 | Box 87 \ 2 scan0076 | |
| Letter acknowledging receipt of strengthened pistons for testing. | 17th Sep 1935 | Box 87 \ 2 scan0077 | |
| Letter from The Light Production Co. Ltd. analysing the reasons for returned pistons. | 20th Sep 1935 | Box 87 \ 2 scan0078 | |
| Letter from a supplier discussing the return of a large quantity of pistons and associated quality issues. | 20th Sep 1935 | Box 87 \ 2 scan0079 | |
| Letter to The Light Production Co. Ltd. requesting a drawing of a 3 1/4' bore piston. | 15th Oct 1935 | Box 87 \ 2 scan0080 | |
| Order be placed for 24 scraper rings for a 3 1/4' bore Bentley. | 28th Oct 1935 | Box 87 \ 2 scan0081 | |
| Requesting an order for 36 scraper rings for 3 1/4' bore Bentley pistons from the Light Production Co. Ltd. | 28th Oct 1935 | Box 87 \ 2 scan0082 | |
| Requesting an order for 48 scraper rings for 3 1/2' bore Bentley pistons. | 29th Oct 1935 | Box 87 \ 2 scan0083 | |
| Complaints of excessive oil consumption in Bentley chassis and proposed piston ring solutions. | 29th Oct 1935 | Box 87 \ 2 scan0084 | |
| Request to prepare a set of longer connecting rods with Spectre size small ends for testing in a Bentley. | 2nd Nov 1935 | Box 87 \ 2 scan0085 | |
| Complaints of excessive oil consumption on Bentley chassis and the proposed trial of more effective piston rings. | 5th Nov 1935 | Box 87 \ 2 scan0086 | |
| Letter to The Light Production Co. Ltd. requesting a specification for 3 1/4' Bore Bentley Pistons. | 5th Nov 1935 | Box 87 \ 2 scan0087 | |
| Letter from The Light Production Co. Ltd. to the Experimental Department confirming a visit to finalise details for the 3 1/2' Bentley Piston. | 6th Nov 1935 | Box 87 \ 2 scan0088 | |
| File note detailing the specifications for a Mark V piston for a Large Bore Bentley. | 6th Nov 1935 | Box 87 \ 2 scan0089 | |
| Instruction to modify a set of E.B.2124 Scraper Rings to drawing E.B.514. | 12th Nov 1935 | Box 87 \ 2 scan0090 | |
| Request to send an official order to the Light Production Co. for piston rings for a 3 1/2' bore Bentley. | 14th Nov 1935 | Box 87 \ 2 scan0091 | |
| Letter to The Light Production Co. Ltd. requesting the supply of compression and scraper rings with a turned finish. | 14th Nov 1935 | Box 87 \ 2 scan0092 | |
| Order for 36 Piston Rings from the Light Production Company. | 25th Nov 1935 | Box 87 \ 2 scan0093 | |
| Advice note from The Light Production Co. Ltd. for the dispatch of six Mark V Aerolite pistons. | 25th Nov 1935 | Box 87 \ 2 scan0094 | |
| Request to order 15 Scraper Rings with increased width from the Light Production Co. Ltd. | 26th Nov 1935 | Box 87 \ 2 scan0095 | |
| Handover of Aerolite pistons for chartmaking and fitting to a B-14 unit. | 26th Nov 1935 | Box 87 \ 2 scan0096 | |
| Attached invoices from the Light Production Co. Ltd. for experimental pistons. | 28th Nov 1935 | Box 87 \ 2 scan0097 | |
| Letter regarding the return of a cracked piston to The Light Production Co. Ltd. and a request for a replacement. | 28th Nov 1935 | Box 87 \ 2 scan0098 | |
| Requesting a covering order for piston rings from the Light Production Co. | 28th Nov 1935 | Box 87 \ 2 scan0099 | |
| Order to be placed for pistons with the Light Production Co. | 29th Nov 1935 | Box 87 \ 2 scan0100 | |
| Letter to The Light Production Co. Ltd. requesting a replacement of 2 pistons due to a failure and a set of final production pistons. | 3rd Dec 1935 | Box 87 \ 2 scan0101 | |
| Telegram requesting two sets of 3 1/2' bore pistons for testing purposes. | 9th Dec 1935 | Box 87 \ 2 scan0102 | |
| Invoice discrepancy for Aerolite Pistons from the Light Production Co. Ltd. | 16th Dec 1935 | Box 87 \ 2 scan0103 | |
| Official order for an Aerolite piston. | 19th Dec 1935 | Box 87 \ 2 scan0104 | |
| Request to place an order for 12 Aerolite Pistons, Mark V, from the Light Production Co. | 19th Dec 1935 | Box 87 \ 2 scan0105 | |
| Telegram regarding the awaited delivery of 3 1/2' Bentley pistons for experimental testing. | 20th Dec 1935 | Box 87 \ 2 scan0106 | |
| Letter from a supplier confirming the specification of twelve delivered pistons and explaining the process for weight adjustment. | 20th Dec 1935 | Box 87 \ 2 scan0107 | |
| Letter from The Light Production Co. Ltd. to Messrs. Rolls Royce Ltd, this is page 2 of the letter. | 31th Dec 1935 | Box 87 \ 2 scan0108 | |
| Order for a set of Bentley Pistons. | 31th Dec 1935 | Box 87 \ 2 scan0109 | |
| Letter to The Light Production Co.Ltd. requesting a set of pistons for an undersized cylinder block. | 31th Dec 1935 | Box 87 \ 2 scan0110 | |
| Advice note for the dispatch of six Mark V Aerolite Pistons to the Experimental Department. | 8th Jan 1935 | Box 87 \ 2 scan0111 | |
| Advice note for the dispatch of piston rings and slotted screws to the Experimental Department. | 9th Jan 1936 | Box 87 \ 2 scan0112 | |
| Request to send an official order for three sets of Aerolite Pistons for a 3½ inch bore Bentley. | 10th Jan 1936 | Box 87 \ 2 scan0113 | |
| Letter to The Light Production Co. Ltd. requesting three sets of 3½' bore Bentley pistons and discussing their performance during endurance testing. | 10th Jan 1936 | Box 87 \ 2 scan0114 | |
| Letter to The Light Production Co. Ltd. regarding the procurement of experimental pistons. | 15th Jan 1936 | Box 87 \ 2 scan0115 | |
| Requesting a detailed drawing of a modified piston for the Large Bore Bentley Chassis. | 15th Jan 1936 | Box 87 \ 2 scan0116 | |
| Request to place an official order for piston and slotted scraper rings from the Light Production Co. | 16th Jan 1936 | Box 87 \ 2 scan0117 | |
| Referencing a drawing for large bore pistons which have been standardised with a new part and casting number. | 17th Jan 1936 | Box 87 \ 2 scan0118 | |
| Letter to The Light Production Co. Ltd. regarding the production of an experimental set of pistons as a sand casting. | 22th Jan 1936 | Box 87 \ 2 scan0119 | |
| Letter from The Light Production Co. Ltd. regarding the production of experimental 3 3/4' pistons. | 17th Jan 1936 | Box 87 \ 2 scan0120 | |
| Letter from The Light Production Co. Ltd. regarding proposed piston changes for a 3 3/4' bore engine. | 17th Jan 1936 | Box 87 \ 2 scan0121 | |
| Letter to The Light Production Co. Ltd. requesting a price for three sets of experimental pistons. | 24th Jan 1936 | Box 87 \ 2 scan0122 | |
| Letter from The Light Production Co. Ltd. to the Experimental Department regarding a quotation for three sets and recuperation of Mr. Brooks. | 25th Jan 1936 | Box 87 \ 2 scan0123 | |
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