| Description | Date | Identifier | |
| Potential engine damage from 8-cylinder period harmonics and the capabilities of torsional crankshaft dampers. | 19th Mar 1928 | Box 25 \ 3 Scan329 | |
| Competitor improvements and proposing progressive development changes. | 27th Mar 1928 | Box 25 \ 3 Scan330 | |
| Letter arranging an unofficial visit to a research student to discuss crankshaft torsional vibrations. | 17th Apr 1928 | Box 25 \ 3 Scan331 | |
| Letter detailing the methodology and results for crankshaft torsion tests. | 19th Apr 1928 | Box 25 \ 3 Scan332 | |
| Letter discussing ongoing tests on crankshaft stiffness and torsional frequency, including related calculations. | 19th Apr 1933 | Box 25 \ 3 Scan333 | |
| Blueprint detailing the method for measuring the twist in crankshafts. | 19th Apr 1933 | Box 25 \ 3 Scan334 | |
| Letter to Major Carter at the Royal Aircraft Establishment regarding crankshaft torsional vibrations and attached test information. | 23th Apr 1928 | Box 25 \ 3 Scan335 | |
| Crankshaft stiffness, calculations, and comparisons with other engine designs. | 23th Apr 1928 | Box 25 \ 3 Scan336 | |
| Letter discussing upcoming tests on experimental crankshafts and the F.X1 aero engine torsional period. | 25th Apr 1928 | Box 25 \ 3 Scan337 | |
| Letter from H. Constant at the Engineering Laboratory, Cambridge, to Mr. Tresilian arranging a meeting. | 25th Apr 1928 | Box 25 \ 3 Scan338 | |
| Letter from the Royal Aircraft Establishment concerning Crankshaft Torsion Tests. | 25th Apr 1928 | Box 25 \ 3 Scan339 | |
| Letter to H. Constant at the Engineering Laboratory, Cambridge, to arrange a visit for the following week. | 26th Apr 1928 | Box 25 \ 3 Scan340 | |
| Letter from the Royal Aircraft Establishment regarding crankshaft torsional vibrations and the stiffness of a new 20 HP shaft. | 30th Apr 1928 | Box 25 \ 3 Scan341 | |
| Letter to Major B.C. Carter of the Royal Aircraft Establishment regarding crankshaft torsional vibrations and bearing stiffness formulas. | 1st May 1928 | Box 25 \ 3 Scan342 | |
| Bearing stiffness measurements for different engine models and outlining a proposal for future experiments. | 3rd May 1928 | Box 25 \ 3 Scan343 | |
| Letter to the Engineering Laboratory in Cambridge regarding crankshaft dimensions, test results, and a formula for estimating torsional periods. | 3rd May 1928 | Box 25 \ 3 Scan344 | |
| Letter discussing modifications to Carter's formula for a 6-cylinder engine and related experiments. | 5th May 1928 | Box 25 \ 3 Scan345 | |
| Visit to Cambridge Engineering Laboratory regarding crankshaft research and torsional vibration testing. | 5th May 1928 | Box 25 \ 3 Scan346 | |
| Engine experiments with gas from oil and preparations for airship work. | 16th May 1928 | Box 25 \ 3 Scan347 | |
| Letter discussing torsion test results on a wide-web Phantom crankshaft and requesting data for a Curtiss D-12 crankshaft. | 16th May 1928 | Box 25 \ 3 Scan348 | |
| Alterations made to car 14-EX, including fitting a hypoid rear axle, and arranging its transport for testing. | 28th Jun 1928 | Box 25 \ 3 Scan349 | |
| Difficulties experienced with new crankshaft dampers on 20 HP and 40/50 HP cars. | 19th Jul 1928 | Box 25 \ 3 Scan350 | |
| The design and issues of damping springs, stops, and friction discs for a drive mechanism. | 19th Jul 1928 | Box 25 \ 3 Scan351 | |
| The slipper wheel and drive versus the 1-G-1 type, and the future requirement for a reduced inertia damper. | 25th Jul 1928 | Box 25 \ 3 Scan352 | |
| Road test report on a new type of spring drive fitted to a 12-EX, detailing weight reductions and performance improvements. | 25th Jul 1928 | Box 25 \ 3 Scan353 | |
| Request to fit up the 12-G-4 crankshaft damper with stronger driving springs and reduced damping friction. | 20th Aug 1928 | Box 25 \ 3 Scan354 | |
| Engine roughness at high speeds in 20 HP and 40/50 HP models, recommending a trial of the balanced crankshaft. | 13th Nov 1928 | Box 25 \ 3 Scan355 | |
| Report suggesting the re-introduction of counterweights on crankshafts to reduce high-speed roughness and vibrations. | 13th Nov 1928 | Box 25 \ 3 Scan356 | |
| Investigating the possible causes of high-speed engine roughness and vibration. | 13th Nov 1928 | Box 25 \ 3 Scan357 | |
| Analysis of engine vibration, resonance, and roughness at high speeds, mentioning the Eagle XVI and 20 HP models. | 13th Nov 1928 | Box 25 \ 3 Scan358 | |
| Analysis of crankshaft torsional periods and distortion of moving parts as causes of high-speed engine vibration. | 13th Nov 1928 | Box 25 \ 3 Scan359 | |
| Engine vibrations, crankshaft distortion, and possible cures such as counter-weights and stiffening the crankcase. | 13th Nov 1928 | Box 25 \ 3 Scan360 | |
| Technical discussion on crankshafts, counterweights, and the properties of materials like cast iron and steel for crankcases. | 13th Nov 1928 | Box 25 \ 3 Scan361 | |
| Reducing high-speed engine roughness, comparing the effects of adding counterweights versus using a stiffer crankcase. | 13th Nov 1928 | Box 25 \ 3 Scan362 | |
| Crankshaft design, counterweights, and a comparison of engine smoothness in various cars. | 13th Nov 1928 | Box 25 \ 3 Scan363 | |
| Engine vibrations and periods, referencing opinions on crankshaft counterweights and balance. | 13th Nov 1928 | Box 25 \ 3 Scan364 | |
| Crankshaft balancing methods and vibration experiments on a 20 HP engine. | 13th Nov 1928 | Box 25 \ 3 Scan365 | |
| Investigation and analysis of engine vibration at various speeds. | 13th Nov 1928 | Box 25 \ 3 Scan366 | |
| Analysis of crankshaft vibration issues, such as 'hogging' and 'sagging', leading to a suggested new crankshaft design for the 20 HP engine. | 13th Nov 1928 | Box 25 \ 3 Scan367 | |
| Crankshaft design improvements, including pin length, disc-web shafts, and testing procedures. | 13th Nov 1928 | Box 25 \ 3 Scan368 | |
| Longitudinal section diagram of a Packard Standard Eight engine. | 16th Nov 1928 | Box 25 \ 3 Scan369 | |
| The reverse side of a document showing a Print Room stamp from Derby. | 16th Nov 1928 | Box 25 \ 3 Scan370 | |
| Diagram showing the inertia loads acting on the crankshaft for a 20 HP engine at 3500 RPM. | 28th Sep 1928 | Box 25 \ 3 Scan371 | |
| Blank document page with a 'Print Room, Derby' date stamp. | 13th Nov 1928 | Box 25 \ 3 Scan372 | |
| Blueprint showing types of counterweights employed in some cars. | 6th Nov 1928 | Box 25 \ 3 Scan373 | |
| Diagram showing the arrangement of counterweights on crankshafts for various competitor engines. | 13th Nov 1928 | Box 25 \ 3 Scan374 | |
| Blueprint for a counterweighted crankshaft for a 20 HP engine, detailing its expected benefits. | 29th Oct 1928 | Box 25 \ 3 Scan375 | |
| Engine dampers, engine mounting, crankshaft balance, and the use of balance weights on the 20 HP model. | 17th Nov 1928 | Box 25 \ 3 Scan376 | |
| Views on crankshaft design, engine vibrations, and the use of balance weights for 6-cylinder engines. | 9th Jan 1929 | Box 25 \ 3 Scan377 | |
| Shaft distortions, vibrations, and how engine components resist dynamic forces. | 9th Jan 1929 | Box 25 \ 3 Scan378 | |
| Methods to reduce engine vibration by using heavy crankshafts, balance-weights, and providing more support to main bearings. | 9th Jan 1929 | Box 25 \ 3 Scan379 | |
| Technical discussion on engine smoothness and vibration, comparing the 20 HP engine with competitor models and considering improvements like counter-weights. | 9th Jan 1929 | Box 25 \ 3 Scan380 | |
| Report page detailing crankshaft design modifications and performance considerations for a 20 HP engine. | 26th Nov 1928 | Box 25 \ 3 Scan381 | |
| Drawing of a counterweighted crankshaft for a 20 HP engine. | 26th Nov 1928 | Box 25 \ 3 Scan382 | |
| Blueprint showing three views of a connecting rod assembly. | 29th Nov 1928 | Box 25 \ 3 Scan383 | |
| Departmental memo regarding an oversight in arranging insurance for a car. | 24th Feb 1911 | Box 25 \ 4 Scan001 | |
| Instruction regarding the insurance logging procedure for any car brought to the Works. | 24th Feb 1911 | Box 25 \ 4 Scan002 | |
| Letter to Mr. Barrington regarding the procedure of telegraphing the works before bringing a car in to be entered into the log book. | 25th Feb 1911 | Box 25 \ 4 Scan003 | |
| Instruction regarding two experimental cars being away from the works for a fortnight and a query about insurance. | 26th Jul 1913 | Box 25 \ 4 Scan004 | |
| Letter confirming personal insurance against death and accidents for drivers of the express car. | 25th Apr 1922 | Box 25 \ 4 Scan005 | |
| Brief typed memo from Hs. to D. forwarding a note received from R. | 14th Aug 1922 | Box 25 \ 4 Scan006 | |
| Request to ensure cars sent for personal use are insured so that visitors can drive them. | 12th Aug 1922 | Box 25 \ 4 Scan007 | |
| Requesting a reply regarding insurance for the Goshawk car (Chassis 7/G/II) which has proceeded to France. | 6th Oct 1922 | Box 25 \ 4 Scan008 | |
| Insurance for Goshawk drivers and the final endurance tests for a Goshawk car in France. | 11th Oct 1922 | Box 25 \ 4 Scan009 | |
| The insurance for the 7-Goshawk-11 car. | 10th May 1923 | Box 25 \ 4 Scan010 | |
| Outlining the insurance policy for company cars used for private purposes. | 1st Feb 1924 | Box 25 \ 4 Scan011 | |
| Clarifying the insurance policy for company cars and specifying who is authorised to drive them. | 7th Feb 1924 | Box 25 \ 4 Scan012 | |
| The dispatch of one brass token to a Mr. Bagley in France. | 28th May 1924 | Box 25 \ 4 Scan013 | |
| Letter regarding a brass medal to be kept in a car and instructions for insurance purposes in case of an accident. | 28th May 1924 | Box 25 \ 4 Scan014 | |
| Car testing in Chateauroux, France, including vehicle modifications and insurance arrangements. | 28th May 1924 | Box 25 \ 4 Scan015 | |
| Note about car 98-NK leaving for France with an insurance disc. | 1st Jun 1924 | Box 25 \ 4 Scan016 | |
| Letter regarding insurance identification tickets and tokens for three cars in France. | 5th Jul 1924 | Box 25 \ 4 Scan017 | |
| Letter discussing insurance and legal arrangements following two separate car accidents. | 7th Jul 1924 | Box 25 \ 4 Scan018 | |
| Letter concerning an insurance identification ticket for a vehicle that will remain in France. | 5th Jul 1924 | Box 25 \ 4 Scan019 | |
| Expiring accident insurance policy for three cars at Chateauroux. | 23th Jul 1924 | Box 25 \ 4 Scan020 | |
| The renewal of car insurance for vehicles at Chateauroux for one month. | 24th Jul 1924 | Box 25 \ 4 Scan021 | |
| The transfer of an insurance identification ticket and arranging for insurance company authority for repairs. | 19th Aug 1924 | Box 25 \ 4 Scan022 | |
| The impending expiration of motor car insurance in France. | 28th Aug 1924 | Box 25 \ 4 Scan023 | |
| Requesting the renewal of insurance for three cars in France. | 29th Aug 1924 | Box 25 \ 4 Scan024 | |
| Return of a Provincial Token related to motor car insurance in France. | 16th Sep 1924 | Box 25 \ 4 Scan025 | |
| Recommendation for compensating an employee injured in an accident in France and a discussion on driver insurance. | 1st Sep 1924 | Box 25 \ 4 Scan026 | |
| Recommendation to insure drivers in the future due to above-average risk. | 26th Sep 1924 | Box 25 \ 4 Scan027 | |
| Recommending a 12-month insurance policy for the Chateauroux Garage. | 26th Sep 1924 | Box 25 \ 4 Scan028 | |
| Request to renew motorcar accident insurance for cars operating in France. | 1st Oct 1924 | Box 25 \ 4 Scan029 | |
| Recommending insurance coverage for drivers and assistants taking cars to France for testing. | 3rd Oct 1924 | Box 25 \ 4 Scan030 | |
| Notification regarding expired licences for chassis 9-PK and 98-NK and an enquiry about their renewal. | 6th Oct 1924 | Box 25 \ 4 Scan031 | |
| Listing drivers who require insurance for travel in France. | 7th Oct 1924 | Box 25 \ 4 Scan032 | |
| Listing names and addresses of men to be insured in France. | 7th Oct 1924 | Box 25 \ 4 Scan033 | |
| Motor car insurance in France involving a lost brass token. | 22th Oct 1924 | Box 25 \ 4 Scan034 | |
| Letter confirming a telegram about testing car springs and sending a brass token. | 29th Oct 1924 | Box 25 \ 4 Scan035 | |
| Found insurance disc for a car being sent to France. | 29th Oct 1924 | Box 25 \ 4 Scan036 | |
| Communication confirming the arrangement of insurance for two cars in France for one month. | 1st Nov 1924 | Box 25 \ 4 Scan037 | |
| Return of two insurance documents that were with car 98-NK. | 28th Nov 1924 | Box 25 \ 4 Scan038 | |
| The expiration and extension of motor car insurance in France. | 5th Dec 1924 | Box 25 \ 4 Scan039 | |
| Inquiry regarding the return of a car from France in order to cancel its insurance. | 12th Dec 1924 | Box 25 \ 4 Scan040 | |
| Return and dispatch of cars to France and the associated insurance arrangements. | 15th Dec 1924 | Box 25 \ 4 Scan041 | |
| The lack of accident insurance for cars in France and the process to arrange cover. | 6th Jan 1925 | Box 25 \ 4 Scan042 | |
| Requesting insurance policies for a list of drivers in France and a separate policy for the author. | 2nd Feb 1925 | Box 25 \ 4 Scan043 | |
| The insurance of cars in France, specifically car 98-NK. | 2nd Feb 1925 | Box 25 \ 4 Scan044 | |
| Letter regarding the insurance of cars being sent to France. | 5th Mar 1925 | Box 25 \ 4 Scan045 | |
| | | | |
