| Description | Date | Identifier | |
| Letter to a supplier requesting the production of specific piston rings and detailing additional requirements for a previous order. | 14th Aug 1936 | Box 87 \ 2 scan0224 | |
| Letter discussing the increased weight of a standard Bentley production piston compared to its original specification. | 15th Aug 1936 | Box 87 \ 2 scan0225 | |
| Recommendations for Simplex ring fitments on Rolls-Royce and Rolls-Bentley pistons. | 15th Aug 1936 | Box 87 \ 2 scan0226 | |
| Order be placed for various types of rings. | 18th Aug 1936 | Box 87 \ 2 scan0227 | |
| Correct manufacturing process for 'L' shape piston rings. | 26th Aug 1936 | Box 87 \ 2 scan0228 | |
| Requesting a covering order for 72 scraper rings received from the Light Production Co. Ltd. | 4th Sep 1936 | Box 87 \ 2 scan0229 | |
| Letter to The Light Production Co. Ltd. ordering various rings and querying the wall pressure of a previously supplied batch. | 11th Sep 1936 | Box 87 \ 2 scan0230 | |
| Letter discussing issues with overweight pistons and returning scored cast rings with excessive gaps. | 11th Sep 1936 | Box 87 \ 2 scan0231 | |
| Official order be passed to The Light Production Co. Ltd. for piston rings. | 11th Sep 1936 | Box 87 \ 2 scan0232 | |
| Requesting the modification of ring grooves on a set of Aerolite Pistons to fit Sealed power Rings. | 11th Sep 1936 | Box 87 \ 2 scan0233 | |
| Clarifying the correct supply of rings ordered from the Light Production Co. Ltd. | 22th Sep 1936 | Box 87 \ 2 scan0234 | |
| Letter to The Light Production Co. Ltd requesting the supply of rings to various drawing specifications. | 24th Sep 1936 | Box 87 \ 2 scan0235 | |
| Requesting an official order be sent to the Light Production Co. Ltd. for rings. | 24th Sep 1936 | Box 87 \ 2 scan0236 | |
| The condition of cylinders for chassis B.34.BN, detailing measurements, modifications, and oil consumption. | 15th Oct 1936 | Box 87 \ 2 scan0237 | |
| Key sheet detailing the procedure for measuring cylinder bore dimensions. | 15th Oct 1936 | Box 87 \ 2 scan0238 | |
| Blueprint showing a cross-section and dimensions for Bentley Cylinder Bores. | 15th Oct 1936 | Box 87 \ 2 scan0239 | |
| The condition and dimensions of cylinder bores after a grind out. | 12th Oct 1936 | Box 87 \ 2 scan0240 | |
| Internal request to order various piston rings for the Paris service station. | 17th Oct 1936 | Box 87 \ 2 scan0241 | |
| Confirming the dispatch of a set of Aerolite pistons and explaining a delay in supplying the associated rings. | 17th Oct 1936 | Box 87 \ 2 scan0242 | |
| Requesting an official order for replacement rings from the Light Production Co. Ltd. | 22th Oct 1936 | Box 87 \ 2 scan0243 | |
| Patent application and modified designs for grooved scraper rings. | 16th Nov 1936 | Box 87 \ 2 scan0244 | |
| Oil consumption tests and the interchangeability of groove-type scraper rings for Bentley and 25/30 engines. | 17th Nov 1936 | Box 87 \ 2 scan0245 | |
| Standardisation report for an Aerolite piston detailing modifications following endurance test failures. | 22th Dec 1936 | Box 87 \ 2 scan0246 | |
| Statement confirming nil tool cost for production starting with the 'L' Series chassis. | 11th Mar 1937 | Box 87 \ 2 scan0247 | |
| Failure of heat-stressed piston rings in Bentley engines and their replacement. | 11th Mar 1937 | Box 87 \ 2 scan0248 | |
| Specifications and production updates for Bentley pistons and scraper rings. | 15th Jun 1937 | Box 87 \ 2 scan0249 | |
| Request to machine six Aerolite pistons for Bentley engines to drawing Rm.216 to fit American piston rings. | 12th Jul 1937 | Box 87 \ 2 scan0250 | |
| Letter from The Light Production Co. Ltd. confirming the dispatch of urgently requested High Pressure Bentley Compression Rings. | 6th Sep 1937 | Box 87 \ 2 scan0251 | |
| Depot sheet memo regarding the fitting of replacement Bentley pistons for the K-series chassis. | 2nd Nov 1937 | Box 87 \ 2 scan0252 | |
| Piston supply issues for a 4.5 Litre Bentley, following an engine seizure. | 24th Nov 1937 | Box 87 \ 2 scan0253 | |
| The correct type of pistons to be fitted to 4¼ Litre Bentley vehicles. | 16th Oct 1937 | Box 87 \ 2 scan0254 | |
| Requesting the sawcutting and drilling of Aerolite pistons for Bentley. | 16th Aug 1938 | Box 87 \ 2 scan0255 | |
| Requesting average bore wear figures for Bentley pistons for comparison with previous pistons. | 23th Jan 1939 | Box 87 \ 2 scan0256 | |
| Requesting sets of raised crown pistons for 4 1/4-litre Bentleys to improve performance and gain experience. | 31th Mar 1939 | Box 87 \ 2 scan0257 | |
| Potential lightening of the propeller shaft on the Bensport chassis. | 12th May 1933 | Box 87 \ 3 scan0001 | |
| Use of Hardy Spicer universal joints with needle roller bearings for the Bentley chassis. | 1st Jun 1933 | Box 87 \ 3 scan0002 | |
| Arrangement and testing of a new 3' diameter Hardy Spicer shaft for a Bentley. | 23th Aug 1933 | Box 87 \ 3 scan0003 | |
| Seizing issues with Bensport Universal Joints and proposing potential solutions. | 13th Sep 1933 | Box 87 \ 3 scan0004 | |
| Adapting needle bearings for the Bensport propeller shaft's universal joints. | 19th Sep 1933 | Box 87 \ 3 scan0005 | |
| Reduction in the circumferential clearance for Bensport Needle Bearing Universal Joints. | 20th Sep 1933 | Box 87 \ 3 scan0006 | |
| Production issues with a spring-damped clutch centre and proposing the use of a slipper wheel type propeller shaft damper for the Bentley. | 11th Dec 1933 | Box 87 \ 3 scan0007 | |
| Arrangement of damper flywheels on a Bentley transmission. | 19th Dec 1933 | Box 87 \ 3 scan0008 | |
| Requesting the return of a faulty Hardy Spicer Propellor Shaft that was removed from vehicle 3-B-IV. | 2nd Jan 1934 | Box 87 \ 3 scan0009 | |
| Standardisation of filling propeller shaft joints with Mobilgrease No. 2. | 3rd Jan 1934 | Box 87 \ 3 scan0010 | |
| Trialing an experimental roller bearing sliding joint for a Bentley Universal Joint. | 1st Mar 1934 | Box 87 \ 3 scan0011 | |
| Testing and potential standardization of propeller shaft dampers. | 1st Jun 1934 | Box 87 \ 3 scan0012 | |
| Request to fit a roller propeller shaft sliding joint and adjust the 3rd motion shaft to measure the increase in float. | 3rd Jul 1934 | Box 87 \ 3 scan0013 | |
| The performance of a Bentley propeller shaft's roller bearing sliding joint. | 31th Oct 1934 | Box 87 \ 3 scan0014 | |
| Graph showing the results of a Bentley propeller shaft torsion test. | 30th Oct 1934 | Box 87 \ 3 scan0015 | |
| Standardisation proposal for a propellor shaft damping device to prevent over-run rattle. | 7th Sep 1934 | Box 87 \ 3 scan0016 | |
| Note on the production cost and implementation for a standard part on the 'D' series chassis. | 20th Sep 1934 | Box 87 \ 3 scan0017 | |
| Test report on a roller propellor shaft sliding joint, detailing wear issues and proposing a change in material. | 15th Nov 1934 | Box 87 \ 3 scan0018 | |
| The loading adjustment for the Bentley propellor shaft damper on 'D' Series Chassis. | 25th Jan 1935 | Box 87 \ 3 scan0019 | |
| Request to reassemble and despatch two Hardy Spicer Bentley propellor shafts to their makers. | 5th Mar 1935 | Box 87 \ 3 scan0020 | |
| Letter to Hardy Spicer Ltd. regarding the return and modification of two Bentley propeller shafts. | 11th Mar 1935 | Box 87 \ 3 scan0021 | |
| Requesting an official order be passed to Messrs. Hardy Spicer Ltd. | 13th Mar 1935 | Box 87 \ 3 scan0022 | |
| Correspondence from Hardy Spicer & Co. enclosing a print for a Bentley Propeller Shaft flange yoke. | 15th Mar 1935 | Box 87 \ 3 scan0023 | |
| Technical drawing of a flange yoke. | 14th Mar 1935 | Box 87 \ 3 scan0024 | |
| Letter from Hardy Spicer & Co. regarding a print for a special propeller shaft against order number 79965. | 19th Mar 1935 | Box 87 \ 3 scan0025 | |
| Technical drawing for a tubular shaft assembly with special joints, manufactured by Hardy Spicer & Co Ltd. | 19th Mar 1935 | Box 87 \ 3 scan0026 | |
| Letter to Messrs. Hardy Spicer & Co. Ltd. confirming agreement on drawing number 35/0375. | 20th Mar 1935 | Box 87 \ 3 scan0027 | |
| Telegram to Autojoints, Birmingham, requesting the delivery date for a propeller shaft order. | 25th Mar 1935 | Box 87 \ 3 scan0028 | |
| Letter from Hardy Spicer & Co. confirming a telegram and promising delivery of a shaft. | 25th Mar 1935 | Box 87 \ 3 scan0029 | |
| Letter to Hardy Spicer & Co. Ltd. about the weight of a propellor shaft fitted to a Bentley. | 8th Apr 1935 | Box 87 \ 3 scan0030 | |
| Letter from Hardy Spicer & Co. Ltd. discussing weight reduction options for a sample shaft. | 10th Apr 1935 | Box 87 \ 3 scan0031 | |
| Payment for a propeller shaft, with handwritten notes questioning the expenditure and suggesting an alternative design. | 24th Apr 1935 | Box 87 \ 3 scan0032 | |
| Recommending payment for an account from Messrs. Hardy Spicer & Co's that includes the cost of certain dies. | 27th Apr 1935 | Box 87 \ 3 scan0033 | |
| Blueprint of propeller shafts with No 50x1' patent 'Layrub' joints. | 24th Jul 1933 | Box 87 \ 3 scan0034 | |
| Letter to Hardy Spicer & Co. Ltd. regarding a propeller shaft for a Bentley chassis and a request to lighten it. | 7th Aug 1935 | Box 87 \ 3 scan0035 | |
| Letter from Hardy Spicer & Co. Ltd. regarding the re-machining of a shaft. | 13th Aug 1935 | Box 87 \ 3 scan0036 | |
| Letter to Hardy Spicer & Co. Ltd. regarding a shaft that ran 12,000 miles in France. | 14th Aug 1935 | Box 87 \ 3 scan0037 | |
| Request to despatch a Hardy Spicer propeller shaft to the makers for examination and lightening. | 14th Aug 1935 | Box 87 \ 3 scan0038 | |
| Letter to Hardy Spicer & Co. Ltd. regarding alterations to a propeller shaft for a 10,000 miles test. | 22th Aug 1935 | Box 87 \ 3 scan0039 | |
| The return of a Hardy Spicer Propeller Shaft to the makers for examination and lightening. | 23th Aug 1935 | Box 87 \ 3 scan0040 | |
| Letter from Hardy Spicer & Co. enclosing correspondence regarding a recent quotation for propeller shafts. | 11th Dec 1935 | Box 87 \ 3 scan0041 | |
| Letter detailing the source of steel and quality control for Hardy Spicer Propeller Shafts. | 27th Nov 1935 | Box 87 \ 3 scan0042 | |
| Letter discussing a revised quotation for a lighter Propeller Shaft using a standard flange yoke. | 27th Nov 1935 | Box 87 \ 3 scan0043 | |
| Letter to Hardy Spicer & Co. Ltd. regarding a 4 lbs. weight saving on a lightened propellor shaft. | 12th Dec 1935 | Box 87 \ 3 scan0044 | |
| Cost reduction on a Bentley by using a Hardy Spicer propeller shaft. | 13th Dec 1935 | Box 87 \ 3 scan0045 | |
| Cost reduction of using a Borg & Beck clutch on the 20/25 model, similar to the Bentley. | 13th Dec 1935 | Box 87 \ 3 scan0046 | |
| Cover letter from Hardy Spicer & Co. for drawing 35/0375 showing the layout of an original Propeller Shaft supplied for testing. | 17th Dec 1935 | Box 87 \ 3 scan0047 | |
| Letter from Laycock Engineering Co enquiring about the testing of a sample Layrub Propeller Shaft. | 21th Dec 1935 | Box 87 \ 3 scan0048 | |
| Request to send a covering order to Hardy Spicer Co. Ltd. for two Bentley propeller shafts. | 2nd Jan 1936 | Box 87 \ 3 scan0049 | |
| Letter to a supplier confirming an order for two lightened type propellor shafts with different finishes. | 2nd Jan 1936 | Box 87 \ 3 scan0050 | |
| Requesting the production of 2 car sets of flanges for Bentley Hardy Spicer propeller shafts. | 2nd Jan 1936 | Box 87 \ 3 scan0051 | |
| Letter from Hardy Spicer & Co. Ltd. enclosing blueprint 36-0005 and discussing the manufacturing of two parts with different finishes. | 4th Jan 1936 | Box 87 \ 3 scan0052 | |
| Letter to Hardy Spicer & Co. Ltd. confirming a drawing is satisfactory and requesting the production of 2 propeller shafts. | 7th Jan 1936 | Box 87 \ 3 scan0053 | |
| Letter to Laycock Engineering Co. regarding the trial of a Layrub Propeller Shaft on an experimental chassis. | 9th Jan 1936 | Box 87 \ 3 scan0054 | |
| Letter from Laycock Engineering Co. in response to a report regarding 'Layrub' Propeller Shafts. | 13th Jan 1936 | Box 87 \ 3 scan0055 | |
| Seeking authorization to pay invoices for two different types of Bentley propeller shafts. | 14th Feb 1936 | Box 87 \ 3 scan0056 | |
| Authorising payment for two Bentley Propellor Shafts. | 2nd Mar 1936 | Box 87 \ 3 scan0057 | |
| Letter to supplier Hardy Spicer & Co. Ltd. requesting modification of a propellor shaft for experimental testing on a Phantom III chassis. | 8th May 1936 | Box 87 \ 3 scan0058 | |
| The return of a Hardy Spicer Propellor Shaft to the manufacturer for modification. | 9th May 1936 | Box 87 \ 3 scan0059 | |
| Letter to Hardy Spicer & Co. Ltd. enclosing an arrangement drawing for a Phantom III propellor shaft. | 11th May 1936 | Box 87 \ 3 scan0060 | |
| Invoice from Hardy Spicer & Co. Ltd for fitting new parts to a shaft. | 19th Jun 1936 | Box 87 \ 3 scan0061 | |
| Requesting to pass an order for modifications carried out on a shaft for which an invoice has been received. | 22th Jun 1936 | Box 87 \ 3 scan0062 | |
| Test report comparing the frictional torque of a Phantom III R.R. propeller shaft against a Bentley Hardy Spicer shaft. | 7th Jul 1936 | Box 87 \ 3 scan0063 | |
| Graph from a prop shaft spline test comparing the thrust load vs torque for a Bentley Hardy-Spicer type and an R.R. Type. | 6th Jul 1936 | Box 87 \ 3 scan0064 | |
| Propshaft spline test report comparing load and torque for a Phantom III and a Bentley (Hardy-Spicer type) propshaft. | 6th Jul 1936 | Box 87 \ 3 scan0065 | |
| Use of proprietary versus externally sourced components and the strategic choice of materials. | 26th Nov 1936 | Box 87 \ 3 scan0066 | |
| | | | |
