| Description | Date | Identifier | |
| Letter to Alexander Duckham & Co.Ltd regarding a delay in comparative oil testing. | 26th Feb 1937 | Box 145 \ 3 scan0087 | |
| Letter to Alexander Duckham & Co. Ltd. providing comparative oil consumption figures for a Bentley test unit. | 16th Mar 1937 | Box 145 \ 3 scan0088 | |
| Requesting laboratory comparison of various shock damper oils and Jack fluid samples. | 3rd May 1937 | Box 145 \ 3 scan0089 | |
| Letter from Alexander Duckham & Co Ltd confirming a meeting to discuss lubrication matters. | 9th Jun 1937 | Box 145 \ 3 scan0090 | |
| Sg. to Rm. regarding correspondence with Mr. A. Duckham about Duckham's Oils. | 16th Jun 1937 | Box 145 \ 3 scan0091 | |
| Letter from A. Duckham to A.F. Sidgreaves of Bentley Motors regarding the testing of Duckhams oils. | 15th Jun 1937 | Box 145 \ 3 scan0092 | |
| Scheduling of bearing and oil tests for Duckham's Oils. | 17th Jun 1937 | Box 145 \ 3 scan0093 | |
| Letter from Alexander Duckham & Co Ltd regarding the examination of a 3¼ Bentley and enclosed correspondence. | 24th Jun 1937 | Box 145 \ 3 scan0094 | |
| Testimonial letter regarding the long-term use and performance of Duckham's oils. | 1st Nov 1936 | Box 145 \ 3 scan0095 | |
| Letter to A. F. Sidgreaves Esq. describing a successful engine oil test comparing Duckham's oil against a competitor's. | 6th Nov 1936 | Box 145 \ 3 scan0096 | |
| Final page of a letter from P. M. Stewart to A. F. Sidgreaves Esq. about future developments. | 6th Nov 1936 | Box 145 \ 3 scan0097 | |
| Proposed oil test using Duckham's Oils on either a Phantom III or 25/30 model car. | 18th Jun 1937 | Box 145 \ 3 scan0098 | |
| Letter to Alexander Duckham explaining a delay in oil testing due to issues with bearing tests. | 18th Jun 1937 | Box 145 \ 3 scan0099 | |
| Requesting an engine inspection on Alexander Duckham's Bentley, and to investigate a servo judder. | 28th Jun 1937 | Box 145 \ 3 scan0100 | |
| Letter discussing the cylinder bore wear of a 3 1/2 litre Bentley and arranging trials with 'Adcoids' and NP.3 oil. | 6th Jul 1937 | Box 145 \ 3 scan0101 | |
| Letter to W.A. Robotham regarding a proposed visit from Mr. Duckham to Derby. | 6th Jul 1937 | Box 145 \ 3 scan0102 | |
| Short typed message confirming Monday as a convenient day for Mr. Duckham. | 9th Jul 1937 | Box 145 \ 3 scan0103 | |
| Letter from Alexander Duckham & Co Ltd regarding tests on Adcoids lubricant and engine oils in Bentley cars. | 9th Jul 1937 | Box 145 \ 3 scan0104 | |
| Letter from Duckham House cancelling a visit to Derby due to Mr. Duckham's slight accident. | 10th Jul 1937 | Box 145 \ 3 scan0105 | |
| Letter concerning the testing of N.P.2 oil and requesting a supply of Adcoids be sent to Paris. | 12th Jul 1937 | Box 145 \ 3 scan0106 | |
| Letter from Duckham House to W.A. Robotham regarding experience with thinner oils. | 6th Jul 1937 | Box 145 \ 3 scan0107 | |
| Sg. to Rm. requesting an update regarding Duckham's Oils. | 14th Jul 1937 | Box 145 \ 3 scan0108 | |
| Results of testing Duckham's lubricating oils. | 15th Jul 1937 | Box 145 \ 3 scan0109 | |
| Letter replying to three queries about the effects of using thin lubricating oils in a vehicle. | 15th Jul 1937 | Box 145 \ 3 scan0110 | |
| Cylinder bore wear on a Bentley using Duckham's oil and Adcoid tablets. | 15th Jul 1937 | Box 145 \ 3 scan0111 | |
| Letter from Alexander Duckham & Co Ltd confirming the dispatch of twelve 1-dozen boxes of Adcoids. | 15th Jul 1937 | Box 145 \ 3 scan0112 | |
| Letter from Duckham House acknowledging receipt of a letter from W. A. Robotham. | 17th Jul 1937 | Box 145 \ 3 scan0113 | |
| Letter from Alexander Duckham & Co Ltd confirming the dispatch of four 10-gallon drums of N.P.3 oil to France. | 21th Jul 1937 | Box 145 \ 3 scan0114 | |
| Request to obtain 50 gallons of Duckhams N.P.3 oil for experimental purposes. | 2nd Aug 1937 | Box 145 \ 3 scan0115 | |
| Letter from a lubrication company regarding the progress and results of oil testing in vehicles. | 18th Sep 1937 | Box 145 \ 3 scan0116 | |
| The concluding page of a letter asking for advice on an unresolved matter. | 17th Sep 1937 | Box 145 \ 3 scan0117 | |
| Engine lubrication record for a 4 1/4-litre Bentley, chassis CXB277. | 17th Sep 1937 | Box 145 \ 3 scan0118 | |
| Testimonial letter regarding the experience of using Duckham's oils in various vehicles and engines since 1904. | 6th Nov 1936 | Box 145 \ 3 scan0119 | |
| Letter detailing a comparative test between Duckham's oil and another brand to resolve engine carbonisation issues. | 6th Nov 1936 | Box 145 \ 3 scan0120 | |
| Concluding page of a letter from P. M. Stewart to A. F. Sidgreaves Esq. regarding a future discussion on cars. | 6th Nov 1938 | Box 145 \ 3 scan0121 | |
| Letter requesting details of S.A.E. 20 & 30 oils from A. Duckham & Co. Ltd. | 20th Sep 1937 | Box 145 \ 3 scan0122 | |
| Letter from Alexander Duckham & Co Ltd detailing the specifications of various lubricating oils. | 21th Sep 1937 | Box 145 \ 3 scan0123 | |
| Test report on the effect of Duckham's 'Sirrom' X.S. Press Oil on bearings. | 23th Feb 1937 | Box 145 \ 3 scan0124 | |
| Test report on Vacuum Gargoyle Hypoid Gear lubricant. | 3rd Mar 1937 | Box 145 \ 3 scan0125 | |
| Test report on Wakefield's Castrol Hi-press Excess Pressure Gear Lubricant. | 12th Mar 1937 | Box 145 \ 3 scan0126 | |
| Supplementary report on a test of Wakefield's Castrol Hi-press oil manufactured for use on American cars. | 12th Mar 1937 | Box 145 \ 3 scan0127 | |
| Running test of Wakefield's Hi-Press Excess Pressure Lubricant, including a laboratory analysis of the oil. | 16th Mar 1937 | Box 145 \ 3 scan0128 | |
| Test report on Henry Prichard & Co.'s 'BRISTOL' Excess Pressure Gear Lubricant. | 17th Mar 1937 | Box 145 \ 3 scan0129 | |
| Test report on the effects of 'Filtrate' extreme pressure gear oil on bearings. | 14th Apr 1937 | Box 145 \ 3 scan0130 | |
| Test report on Anglo-American Oil Co. Ltd. 'Expee 160 Compound' gear lubricant. | 6th May 1937 | Box 145 \ 3 scan0131 | |
| Test report on Shell Mex 'E.P. Spirax' Excess Pressure Gear Lubricant. | 6th May 1937 | Box 145 \ 3 scan0132 | |
| Test report on Wakefield's Special E.P. oil, specifically manufactured for use on American cars. | 15th Apr 1937 | Box 145 \ 3 scan0133 | |
| From Sg. to Rm. concerning Duckham's Oils, requesting a definitive answer. | 27th Sep 1937 | Box 145 \ 3 scan0134 | |
| Copy of a letter from Mr. A. Duckham to Mr. A.F. Sidgreaves regarding a stalled application for oil approval. | 21th Sep 1937 | Box 145 \ 3 scan0135 | |
| Letter to Alexander Duckham & Co. Ltd. confirming the recommendation of their oils in instruction books. | 24th Sep 1937 | Box 145 \ 3 scan0136 | |
| Letter from Alexander Duckham & Co Ltd confirming the recommendation of their N.P. Oils in instruction books. | 14th Oct 1937 | Box 145 \ 3 scan0137 | |
| Internal order request for various types of oil and grease. | 2nd Nov 1937 | Box 145 \ 3 scan0138 | |
| Letter from A. Duckham offering his 4¼ Bentley for inspection and testing after running over 12,000 miles on ADCOIDS. | 16th Nov 1937 | Box 145 \ 3 scan0139 | |
| Letter to Mr. Duckham postponing the inspection of his 4 1/4-litre Bentley until it has reached 30,000 miles. | 18th Nov 1937 | Box 145 \ 3 scan0140 | |
| Letter regarding the overhaul of a 4.5-litre Bentley and an inquiry about the trial of ADCOIDS in Paris. | 19th Nov 1937 | Box 145 \ 3 scan0141 | |
| Letter to S. Bowrey of Alexander Duckham & Co., Ltd. regarding information on adcoids being used in Paris. | 27th Nov 1937 | Box 145 \ 3 scan0142 | |
| Letter from a lubrication technologist discussing a special engine oil with twice the normal load-carrying capacity. | 29th Nov 1937 | Box 145 \ 3 scan0143 | |
| The problems of recommending specific oil brands and suggesting a move to S.A.E. specifications instead. | 6th Dec 1937 | Box 145 \ 3 scan0144 | |
| Reprint from 'Motor Transport' magazine describing the 'Luber-finer' apparatus for continuous oil refining. | 13th Feb 1937 | Box 145 \ 3 scan0145 | |
| Advertisement for the 'Luber-finer' oil refinery system with customer testimonials. | 20th May 1936 | Box 145 \ 3 scan0146 | |
| Advertisement for the Luber-finer oil refiner, detailing its operation and benefits. | 1st Jan 1936 | Box 145 \ 3 scan0147 | |
| Patent specification for improvements to upper cylinder lubricants. | 3rd Apr 1936 | Box 145 \ 3 scan0148 | |
| Patent specification for an improved solid or semi-solid upper cylinder lubricant. | 3rd Apr 1936 | Box 145 \ 3 scan0149 | |
| Proposal to improve the visibility of the oil level indicator for the Wraith III and Bentley 111 engines. | 24th Dec 1937 | Box 145 \ 3 scan0150 | |
| Starting difficulties of 4¼-litre Bentleys and the effect of oil viscosity in cold weather. | 6th Jan 1938 | Box 145 \ 3 scan0151 | |
| Letter to E.G. Acheson Ltd. requesting a quantity of 'running in' compound for testing purposes. | 10th Jan 1937 | Box 145 \ 3 scan0152 | |
| Letter to E.G. Acheson Ltd. postponing the use of their 'running in' compound as the proposed job has fallen through. | 17th Jan 1938 | Box 145 \ 3 scan0153 | |
| Letter confirming the postponement of a proposed test with Running-in Compound containing Acheson Colloidal Graphite. | 18th Jan 1938 | Box 145 \ 3 scan0154 | |
| Letter to A. Duckham & Co. Ltd. inquiring about the differences and suitability of Keenol grease KG.20 and Z.9907 for chassis parts. | 3rd Feb 1938 | Box 145 \ 3 scan0155 | |
| Requesting an official order be sent to Messrs. Sanderson & Holmes for 1 quart of Lovejoy shock damper oil. | 3rd Feb 1938 | Box 145 \ 3 scan0156 | |
| Letter from Alexander Duckham & Co Ltd describing the composition and suitability of various lubricant grades. | 4th Feb 1938 | Box 145 \ 3 scan0157 | |
| Clarifying the correct Duckham's grease for Wraith brakes and chassis lubrication to avoid mix-ups. | 5th Feb 1938 | Box 145 \ 3 scan0158 | |
| Letter from the Anglo-American Oil Company chasing the approval of Essolube oil. | 11th Feb 1938 | Box 145 \ 3 scan0159 | |
| Letter to the Anglo-American Oil Company regarding a delayed response due to Mr. Robotham's absence. | 14th Feb 1938 | Box 145 \ 3 scan0160 | |
| Letter to the Anglo-American Oil Company regarding oil recommendations for Instruction Books. | 21th Feb 1938 | Box 145 \ 3 scan0161 | |
| Letter to an oil company regarding the labeling of oil cans with S.A.E. viscosity numbers. | 9th Mar 1938 | Box 145 \ 3 scan0162 | |
| Letter from Alexander Duckham & Co. Ltd regarding the labelling of oil packages with S.A.E. viscosity numbers. | 11th Mar 1938 | Box 145 \ 3 scan0163 | |
| The difficulties of recommending oils by name and proposing a switch to listing the oil company and viscosity number. | 28th Mar 1938 | Box 145 \ 3 scan0164 | |
| Switch from oil trade names to SAE viscosity numbers in instruction books. | 24th Mar 1938 | Box 145 \ 3 scan0165 | |
| Changes to oil specifications and availability from various suppliers. | 24th Mar 1938 | Box 145 \ 3 scan0166 | |
| List of required modifications and points of attention for the Wraith III Oil Level Indicator. | 8th Mar 1938 | Box 145 \ 3 scan0167 | |
| Log of oil sample mileage for two vehicles, 26.G.VI - 25/30 and O.B.IV - BENTLEY, noting oil filter performance. | 7th Apr 1938 | Box 145 \ 3 scan0168 | |
| Piston scuffing trouble in relation to standardizing different grades of S.A.E. oil. | 8th Apr 1938 | Box 145 \ 3 scan0169 | |
| The causes of and solutions for piston scuffing on experimental Wraith engines. | 5th Apr 1938 | Box 145 \ 3 scan0170 | |
| Test method for producing scuffed pistons and comparing the effectiveness of different engine oils. | 5th Apr 1938 | Box 145 \ 3 scan0171 | |
| Photograph of a standard piston after undergoing scuffing tests. | 5th Apr 1938 | Box 145 \ 3 scan0172 | |
| Photograph and report on piston scuffing tests, showing a scuffed piston after testing. | 5th Apr 1938 | Box 145 \ 3 scan0173 | |
| Photograph showing a tin-plated piston and rings after scuffing tests. | 5th Apr 1938 | Box 145 \ 3 scan0174 | |
| Photograph of a piston after a scuffing test, with a typed descriptive label. | 5th Apr 1938 | Box 145 \ 3 scan0175 | |
| Photograph showing a piston after a scuffing test with no signs of scuffing. | 12th Apr 1938 | Box 145 \ 3 scan0176 | |
| Recommendations on the use of S.A.E. 20 and S.A.E. 30 oils in cars, discussing consumption and starting advantages. | 12th Apr 1938 | Box 145 \ 3 scan0177 | |
| Recommended oils and lubricants for the Bentley M. Series. | 2nd Apr 1938 | Box 145 \ 3 scan0178 | |
| Inclusion of oil viscosity numbers on cans and in the Instruction Book. | 20th Apr 1938 | Box 145 \ 3 scan0179 | |
| The use of thin oils on Bentley cars to reduce cylinder bore wear after a re-bore. | 6th May 1938 | Box 145 \ 3 scan0180 | |
| Letter from Alexander Duckham & Co Ltd regarding a mistake in printed slips for instruction manuals and S.A.E. reference numbers for their oils. | 9th May 1938 | Box 145 \ 3 scan0181 | |
| Letter to Alexander Duckham & Co. Ltd. inquiring about their range of oils. | 11th May 1938 | Box 145 \ 3 scan0182 | |
| The use of specific viscosity oils for 'M' series Bentley cars and Phantom III gearboxes. | 24th May 1938 | Box 145 \ 3 scan0183 | |
| Recommending specific viscosity 50 oils for the Phantom III 'D' series gearbox. | 24th May 1938 | Box 145 \ 3 scan0184 | |
| Sending two blueprints for a crankshaft rear end oil retainer and crankcase end cover. | 1st Jun 1938 | Box 145 \ 3 scan0185 | |
| Complaint that outside inspectors show bias in their recommendations for chassis lubricants. | 27th Jun 1938 | Box 145 \ 3 scan0186 | |
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