| Description | Date | Identifier | |
| Dimensions and clearances of piston ring grooves for 25/30 and Wraith models. | 19th Aug 1938 | Box 148 \ 3 scan0375 | |
| Letter discussing the tin plating of piston rings and cylinder blocks for testing and research purposes. | 20th Aug 1938 | Box 148 \ 3 scan0376 | |
| Letter discussing bad oil consumption and requesting an opinion on tin-plating. | 20th Aug 1938 | Box 148 \ 3 scan0377 | |
| Request to dispatch piston rings to Messrs. The Light Production Co. Ltd. | 22th Aug 1938 | Box 148 \ 3 scan0378 | |
| Internal order request for 32 pistons from The Light Production Co. Ltd. | 25th Aug 1938 | Box 148 \ 3 scan0379 | |
| Letter to Wellworthy Ltd. from the Experimental Department regarding a friction test for research on cylinder bore wear. | 25th Aug 1938 | Box 148 \ 3 scan0380 | |
| Letter to The Light Production Co. Ltd. concerning the dispatch, modification, and ordering of pistons. | 25th Aug 1938 | Box 148 \ 3 scan0381 | |
| Letter from The Light Production Co. Ltd. discussing the tin coating of piston rings and their composition. | 25th Aug 1938 | Box 148 \ 3 scan0382 | |
| Letter from The Light Production Co. Ltd. discussing the survivability of a coating exposed to flame. | 25th Aug 1938 | Box 148 \ 3 scan0383 | |
| Letter from The Light Production Co. Ltd. regarding the machining, dispatch, and further supply of pistons. | 29th Aug 1938 | Box 148 \ 3 scan0384 | |
| Letter from Wellworthy Piston Rings discussing the testing of cylinder and piston ring material wear. | 31th Aug 1938 | Box 148 \ 3 scan0385 | |
| Letter from Wellworthy Piston Rings discussing methods for testing the wear value of centrifugally cast piston ring material. | 31th Aug 1938 | Box 148 \ 3 scan0386 | |
| Letter from Hepworth & Grandage Ltd enclosing a synopsis on piston rings by Spitzglass & Zucrow. | 2nd Sep 1938 | Box 148 \ 3 scan0387 | |
| Letter to Wellworthy Ltd. regarding an enquiry for special test pieces made from piston ring material and a proposed meeting. | 2nd Sep 1938 | Box 148 \ 3 scan0388 | |
| Return and completion of twelve pistons by Light Production Co. | 6th Sep 1938 | Box 148 \ 3 scan0389 | |
| Letter to Hepworth & Grandage Ltd. regarding a synopsis on piston rings. | 12th Sep 1938 | Box 148 \ 3 scan0390 | |
| Requesting the machining of piston scraper rings to reduce bedding-in time. | 14th Sep 1938 | Box 148 \ 3 scan0391 | |
| Internal memorandum requesting an order to be sent for four special pistons. | 19th Sep 1938 | Box 148 \ 3 scan0392 | |
| Request to The Light Production Co. Ltd. to supply four unfinished pistons to drawing EB.2844. | 19th Sep 1938 | Box 148 \ 3 scan0393 | |
| Letter to a piston ring supplier about an investigation into over-oiling and oil consumption linked to uneven bedding on scraper rings. | 23th Sep 1938 | Box 148 \ 3 scan0394 | |
| Page 2 of a letter discussing unit loading, bedding in, and the temper of rings. | 23th Sep 1938 | Box 148 \ 3 scan0395 | |
| Letter from The Light Production Co. Ltd. regarding the dispatch of four piston castings for EB.2844. | 23th Sep 1938 | Box 148 \ 3 scan0396 | |
| Request to despatch a single piston ring to Wellworthy Piston Rings Ltd. | 23th Sep 1938 | Box 148 \ 3 scan0397 | |
| Letter from Wellworthy Piston Rings responding to concerns about a slotted oil control ring not bedding-in correctly. | 27th Sep 1938 | Box 148 \ 3 scan0398 | |
| Letter from supplier Wellworthy Piston Rings Ltd. regarding the specifications and supply of cell-faced rings for testing. | 28th Sep 1938 | Box 148 \ 3 scan0399 | |
| Order for 14 pistons to drawing EXS.928. | 28th Sep 1938 | Box 148 \ 3 scan0400 | |
| Request from the Experimental Department to Light Production Co. to produce 14 pistons. | 28th Sep 1938 | Box 148 \ 3 scan0401 | |
| Letter to Wellworthy Piston Rings Ltd. agreeing to trial a batch of 72 cell-faced rings. | 29th Sep 1938 | Box 148 \ 3 scan0402 | |
| Letter from Wellworthy Piston Rings Ltd. confirming a trial batch of normal and half cell-faced rings. | 3rd Oct 1938 | Box 148 \ 3 scan0403 | |
| Recommending piston modifications to prevent seizure. | 4th Oct 1938 | Box 148 \ 3 scan0404 | |
| Results of tests on various modified pistons for Wraith and Bentley models. | 4th Oct 1938 | Box 148 \ 3 scan0405 | |
| Photograph showing a comparison of three numbered engine pistons. | 28th May 1931 | Box 148 \ 3 scan0406 | |
| Requesting an order be placed with Wellworthy Piston Rings Ltd. for 72 piston rings. | 5th Oct 1938 | Box 148 \ 3 scan0407 | |
| Letter from Wellworthy Piston Rings clarifying an order for piston rings, part no. E.60821. | 10th Oct 1938 | Box 148 \ 3 scan0408 | |
| Request to dispatch four pistons to Light Production Co. for finishing to Drawing EB.2844. | 10th Oct 1938 | Box 148 \ 3 scan0409 | |
| Letter from the Experimental Dept. to The Light Production Co. Ltd. regarding the return of heat-treated pistons. | 10th Oct 1938 | Box 148 \ 3 scan0410 | |
| Letter from The Light Production Co. Ltd. regarding the 'Ferrox' treatment for piston rings. | 11th Oct 1938 | Box 148 \ 3 scan0411 | |
| Letter discussing laboratory research on an oxide treatment for Merlin engine rings and comparing them to American rings. | 12th Oct 1938 | Box 148 \ 3 scan0412 | |
| Letter to Wellworthy Piston Rings Ltd. clarifying a split batch order for two different types of piston ring finish. | 12th Oct 1938 | Box 148 \ 3 scan0413 | |
| Requesting an order for 15 trial rings modified to the 'Aero' multivent principle. | 13th Oct 1938 | Box 148 \ 3 scan0414 | |
| Letter to Wellworthy Piston Rings Ltd. requesting a pamphlet titled 'Points on Piston Rings'. | 13th Oct 1938 | Box 148 \ 3 scan0415 | |
| Letter from Wellworthy Piston Rings Ltd. confirming a quantity restriction on an order for 72 rings. | 13th Oct 1938 | Box 148 \ 3 scan0416 | |
| Letter to C.H. Brooks of Light Production Co., Ltd. acknowledging receipt of their letter and advising of a delay in response. | 12th Oct 1938 | Box 148 \ 3 scan0417 | |
| Order for piston rings from Wellworthy Ltd. and the subsequent supply, seeking confirmation on revised instructions. | 24th Oct 1938 | Box 148 \ 3 scan0418 | |
| Letter from The Light Production Co. Ltd. regarding the machining and marking of four pistons. | 24th Oct 1938 | Box 148 \ 3 scan0419 | |
| Clarifying an order for 72 rings and awaiting instructions for the return of an over-supplied batch from Messrs. Wellworthy. | 25th Oct 1938 | Box 148 \ 3 scan0420 | |
| Telegram to Brooks in London urgently requesting pistons part number EXS.928. | 26th Oct 1938 | Box 148 \ 3 scan0421 | |
| Letter from The Light Production Co. Ltd. confirming a new delivery date for pistons due to difficulty with the castings. | 28th Oct 1938 | Box 148 \ 3 scan0422 | |
| Stock transfer list for chassis engine pistons and piston rings. | 13th Sep 1943 | Box 148 \ 3 scan0423 | |
| Parts list for various engine components including bearings, bushes, and cylinder liners. | 13th Sep 1943 | Box 148 \ 3 scan0424 | |
| Parts list for various types of Vandervell bearings and washers. | 13th Sep 1943 | Box 148 \ 3 scan0425 | |
| Confirmation of a phone message about propeller shaft whirl, proposing to shorten the universal joint distance to solve vibration issues. | 24th Aug 1932 | Box 148 \ 4 scan0001 | |
| Whirling speed of propeller shafts and a potential reason for calculation failures. | 24th Aug 1932 | Box 148 \ 4 scan0002 | |
| Confirmation of a telegram regarding permanent designs for a propeller shaft. | 25th Aug 1932 | Box 148 \ 4 scan0003 | |
| Whirling of propeller shafts and the formula used for its calculation. | 15th Aug 1932 | Box 148 \ 4 scan0004 | |
| Unexpected propeller shaft thrust and potential engineering solutions. | 4th Sep 1932 | Box 148 \ 4 scan0005 | |
| Tests on binding propeller shaft splines, discussing failures and proposing solutions. | 20th Sep 1932 | Box 148 \ 4 scan0006 | |
| Propeller shaft thrust and whirling speed, detailing test results and future plans. | 26th Sep 1932 | Box 148 \ 4 scan0007 | |
| Propeller shaft thrust tests and material considerations. | 26th Sep 1932 | Box 148 \ 4 scan0008 | |
| Material variation in propeller shaft tubes received from a supplier and a request for testing. | 6th Oct 1932 | Box 148 \ 4 scan0009 | |
| Results of tests on hardened and white metal propeller shaft splines for the Peregrine engine. | 24th Oct 1932 | Box 148 \ 4 scan0010 | |
| Graph plotting sliding effort against torque for a Peregrine propeller shaft with hardened splines. | 8th Oct 1932 | Box 148 \ 4 scan0011 | |
| Graph of sliding effort versus torque for a Peregrine propeller shaft with white-metalled splines. | 18th Oct 1932 | Box 148 \ 4 scan0012 | |
| Balancing propeller shafts to eliminate vibration, detailing tests and the effectiveness of a Trebel machine. | 3rd Nov 1932 | Box 148 \ 4 scan0013 | |
| Continuation of a document discussing methods for balancing propeller shafts and other components using a Trebel machine. | 3rd Nov 1932 | Box 148 \ 4 scan0014 | |
| The results of tests on propeller shaft splines sheaving. | 23th Nov 1932 | Box 148 \ 4 scan0015 | |
| Graph plotting sliding effort versus torque for various types of Peregrine propeller shaft splines. | 18th Nov 1932 | Box 148 \ 4 scan0016 | |
| Work in progress report discussing methods to reduce friction in a sliding joint on a propeller shaft. | 6th Dec 1932 | Box 148 \ 4 scan0017 | |
| Suggestion for a roller bearing sliding joint on the propeller shaft, designed for the Peregrine car. | 28th Jan 1933 | Box 148 \ 4 scan0018 | |
| Letter requesting a suitable propeller shaft for a Bentley car and detailing issues with the existing component. | 26th Apr 1933 | Box 148 \ 4 scan0019 | |
| Letter from a supplier requesting further data to determine the most suitable size of Mechanics Universal Joints. | 3rd May 1933 | Box 148 \ 4 scan0020 | |
| Letter responding to a request for data sheets regarding universal joints. | 8th May 1933 | Box 148 \ 4 scan0021 | |
| Completed data sheet for universal joints from the Mechanics Universal Joint Company. | 2nd Dec 1929 | Box 148 \ 4 scan0022 | |
| Letter from Benjamin Whittaker Ltd. regarding the appropriate size of a Mechanics Universal Joint for a Bentley car. | 12th May 1933 | Box 148 \ 4 scan0023 | |
| Adoption of universal joints with needle bearings from Hardy Spicer. | 25th May 1933 | Box 148 \ 4 scan0024 | |
| Drawing of a tubular shaft assembly with associated joints and dimensions. | 12th Apr 1933 | Box 148 \ 4 scan0025 | |
| Specifications for the Bensport propeller shaft. | 27th May 1933 | Box 148 \ 4 scan0026 | |
| Urgent memo concerning an incorrectly sized propeller shaft received from a supplier, Hardy Spicer. | 3rd Jul 1933 | Box 148 \ 4 scan0027 | |
| Mistake made on the length of a Hardy Spicer propeller shaft for a Bentley. | 3rd Jul 1933 | Box 148 \ 4 scan0028 | |
| Letter from Benjamin Whittaker Ltd. submitting a print of a proposed shaft with new roller-bearing joints. | 26th Sep 1933 | Box 148 \ 4 scan0029 | |
| Letter to Benjamin Whittaker Ltd. requesting another print of a drawing for a proposed propeller shaft. | 27th Sep 1933 | Box 148 \ 4 scan0030 | |
| Letter from Benjamin Whittaker Ltd. regarding Mechanics Roller Bearing Universal Joints, drawings, and pricing. | 28th Sep 1933 | Box 148 \ 4 scan0031 | |
| Blueprint for a #3 C. Double Universal Joint Assembly, proposed for a Bentley Sports car. | 15th Feb 1933 | Box 148 \ 4 scan0032 | |
| Letter to Benjamin Whittaker Ltd. regarding a propeller shaft design for a Bentley chassis, questioning the swaged ends. | 29th Sep 1933 | Box 148 \ 4 scan0033 | |
| Letter from Benjamin Whittaker Ltd. discussing the design and manufacture of universal joints with swaged tubing. | 3rd Oct 1933 | Box 148 \ 4 scan0034 | |
| Continuation page of a letter from Benjamin Whittaker, Ltd. | 6th Oct 1933 | Box 148 \ 4 scan0035 | |
| Letter from the Experimental Dept. to Benjamin Whittaker Ltd. regarding tests on parallel tube propeller shafts. | 6th Oct 1933 | Box 148 \ 4 scan0036 | |
| Features and benefits of the Layrub Flexible Propeller Shaft Coupling. | 28th Sep 1934 | Box 148 \ 4 scan0037 | |
| Design proposal to eliminate certain transmission and clutch components. | 28th Sep 1934 | Box 148 \ 4 scan0038 | |
| Technical memo discussing the design, fitting, and adjustment of a propeller shaft with a Layrub joint. | 15th Nov 1934 | Box 148 \ 4 scan0039 | |
| Supply, manufacture, and testing of a Layrub joint and propeller shaft by Laycock Engineering Co. | 15th Nov 1934 | Box 148 \ 4 scan0040 | |
| Assembly clearance for a Bentley propeller shaft with a Layrub joint. | 15th Nov 1934 | Box 148 \ 4 scan0041 | |
| Requesting data and figures for the Hamilton Propeller Blade to finalize the hub design. | 7th Feb 1935 | Box 148 \ 4 scan0042 | |
| Modified Hardy Spicer propellor shaft and a request for comparative prices. | 18th Nov 1935 | Box 148 \ 4 scan0043 | |
| New rubber mountings for petrol pumps on the 25-30 and Phantom III models to reduce noise. | 21th Feb 1936 | Box 148 \ 4 scan0044 | |
| Letter from Benjamin Whittaker Ltd. proposing options for supplying propeller shaft components for an experimental chassis. | 3rd Nov 1936 | Box 148 \ 4 scan0045 | |
| Blueprint of a Type No 4 C. 'Mechanics' Universal Propeller Shaft. | 12th Oct 1938 | Box 148 \ 4 scan0046 | |
| Letter to Benjamin Whittaker Ltd. regarding the supply and dynamic balancing of propeller shafts. | 4th Nov 1936 | Box 148 \ 4 scan0047 | |
| Sourcing of electrically welded carbon steel tubes from Tube Products Ltd for propeller shafts. | 1st Dec 1936 | Box 148 \ 4 scan0048 | |
| Manufacturing methods for chassis propeller shafts, comparing butt welded tubes to drawn tubes. | 14th Dec 1936 | Box 148 \ 4 scan0049 | |
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