| Description | Date | Identifier | |
| The heat treatment process for Peregrine Chassis cylinder liners. | 5th Jan 1933 | Box 2 \ 3 B002_X 116 117 119 120-page41 | |
| Blueprint for a new water distribution arrangement in the cylinder block for the Peregrine 3 chassis. | 17th Jan 1933 | Box 2 \ 3 B002_X 116 117 119 120-page42 | |
| Modification to the Peregrine Cylinder Head E.100940 to reduce the compression ratio. | 6th Feb 1933 | Box 2 \ 3 B002_X 116 117 119 120-page43 | |
| Completion of two types of Peregrine cylinder heads for research work. | 13th Jun 1933 | Box 2 \ 3 B002_X 116 117 119 120-page44 | |
| Experiments on turbulent and non-turbulent cylinder heads and their effect on maximum power output. | 21th Jun 1933 | Box 2 \ 3 B002_X 116 117 119 120-page45 | |
| Performance graph comparing different cylinder head configurations on a Peregrine engine with open exhaust. | 28th Jan 1941 | Box 2 \ 3 B002_X 116 117 119 120-page46 | |
| Maximum possible cylinder bore dimensions for the Peregrine engine. | 16th Nov 1935 | Box 2 \ 3 B002_X 116 117 119 120-page47 | |
| Blank page with the handwritten page number '120' in the top right corner. | 29th Jan 1933 | Box 2 \ 3 B002_X 116 117 119 120-page48 | |
| Confirming that following an inspection, the Peregrine car dashboard is sufficiently wide. | 29th Jan 1933 | Box 2 \ 3 B002_X 116 117 119 120-page49 | |
| The design and width of the Peregrine dashboard. | 13th Jan 1933 | Box 2 \ 3 B002_X 116 117 119 120-page50 | |
| Proposal to manufacture the Peregrine dashboard as a pressing for economic reasons. | 28th Dec 1932 | Box 2 \ 3 B002_X 116 117 119 120-page51 | |
| Modifications to the Peregrine dashboard, changing its manufacture from a casting to a pressing. | 3rd Mar 1933 | Box 2 \ 3 B002_X 116 117 119 120-page52 | |
| Modifications to the Peregrine frame's brake differential cross member and carrier brackets. | 10th Sep 1932 | Box 2 \ 4 B002_X 127 128-page01 | |
| Manufacturing process and cost of milling cold-pressed frames for the 'Peregrine' project. | 20th Dec 1932 | Box 2 \ 4 B002_X 127 128-page02 | |
| Parts list for a strengthened front support for the rear shock damper, related to scheme 307. | 30th Dec 1932 | Box 2 \ 4 B002_X 127 128-page03 | |
| Deflection tests conducted on a rear engine support crossmember. | 19th Jan 1933 | Box 2 \ 4 B002_X 127 128-page04 | |
| Graph showing the results of a deflection and permanent set test on a gearbox and engine rear cross-member. | 18th Jan 1933 | Box 2 \ 4 B002_X 127 128-page05 | |
| Blank page with the handwritten page number '128' in the top right corner. | 26th Sep 1931 | Box 2 \ 4 B002_X 127 128-page06 | |
| Success of a new 4-speed synchro-mesh gearbox and plans for its implementation. | 26th Sep 1931 | Box 2 \ 4 B002_X 127 128-page07 | |
| Technical discussion on gearbox design, focusing on the reverse pinion, gear engagement, and gear ratios. | 5th May 1932 | Box 2 \ 4 B002_X 127 128-page08 | |
| Design proposal for a cost and length-saving shaft for the Bensport & Peregrine gearbox reverse. | 20th May 1932 | Box 2 \ 4 B002_X 127 128-page09 | |
| Decision to retain a right-hand gear change for the Peregrine model. | 14th Jun 1932 | Box 2 \ 4 B002_X 127 128-page10 | |
| Modifications to rectify gear control heaviness and reverse stop spring load issues. | 25th Jun 1932 | Box 2 \ 4 B002_X 127 128-page11 | |
| Specifications and required alteration of a new gear lever reverse stop spring. | 19th Jul 1932 | Box 2 \ 4 B002_X 127 128-page12 | |
| Gearbox specifications and bearing modifications for Bensport and Peregrine models. | 8th Jul 1932 | Box 2 \ 4 B002_X 127 128-page13 | |
| List of notes on the design and manufacturing of gearbox components, page 2. | 28th Jul 1932 | Box 2 \ 4 B002_X 127 128-page14 | |
| Preliminary dynamometer test on the Peregrine gearbox. | 28th Jul 1932 | Box 2 \ 4 B002_X 127 128-page15 | |
| Gear control modifications for the 25HP model to prevent binding and reduce oil drag. | 13th Aug 1932 | Box 2 \ 4 B002_X 127 128-page16 | |
| And comparing the gearbox configurations for the Peregrine and Bensport models. | 27th Aug 1932 | Box 2 \ 4 B002_X 127 128-page17 | |
| Modifications to the clutch and gearbox for the Peregrine. | 30th Aug 1932 | Box 2 \ 4 B002_X 127 128-page18 | |
| Adjustment of ball bearing tolerances for the 25 HP & Peregrine gearbox motion shaft. | 9th Sep 1932 | Box 2 \ 4 B002_X 127 128-page19 | |
| Modification scheme for the Peregrine gearbox. | 9th Sep 1932 | Box 2 \ 4 B002_X 127 128-page20 | |
| Ball bearing fits and tolerances for 25 HP & Peregrine gearboxes. | 12th Sep 1932 | Box 2 \ 4 B002_X 127 128-page21 | |
| Positive interference fit for bearings and gears, and the challenges of production limits. | 12th Sep 1932 | Box 2 \ 4 B002_X 127 128-page22 | |
| Latest drawing for a silent second gear arrangement for the Peregrine chassis. | 14th Dec 1932 | Box 2 \ 4 B002_X 127 128-page23 | |
| Design memorandum for a helical second speed gear for the Peregrine engine. | 24th Dec 1932 | Box 2 \ 4 B002_X 127 128-page24 | |
| Clearance between engaging teeth for helical second-speed gears on various car models. | 14th Jan 1933 | Box 2 \ 4 B002_X 127 128-page25 | |
| Modifications to a universal coupling for helical second-speed gears for the Peregrine engine. | 19th Jan 1933 | Box 2 \ 4 B002_X 127 128-page26 | |
| Test report on the Peregrine gearbox's helical second speed loose pinion. | 1st Feb 1933 | Box 2 \ 4 B002_X 127 128-page27 | |
| Drawing showing the oil level in the Peregrine gearbox on various up gradients. | 16th Feb 1933 | Box 2 \ 4 B002_X 127 128-page28 | |
| Cross-section drawing, Section A-A, of a machined component with dimensions. | 25th Mar 1933 | Box 2 \ 4 B002_X 127 128-page29 | |
| Testing W.W. designs of silent helical second-speed gears on Peregrine, 20/25, and 40/50 chassis. | 25th Mar 1933 | Box 2 \ 4 B002_X 127 128-page30 | |
| Test results of the Peregrine gearbox in a Bentley chassis. | 23th Jan 1934 | Box 2 \ 4 B002_X 127 128-page31 | |
| Experiment to install a Peregrine Gearbox into a Bentley Chassis to save weight and cost. | 22th Jan 1934 | Box 2 \ 4 B002_X 127 128-page32 | |
| Cross-section drawing of a gearbox for Bensport. | 30th Jan 1934 | Box 2 \ 4 B002_X 127 128-page33 | |
| Road testing and modifications for the Peregrine Gearbox, including reducing the back coupling overhang. | 27th Jan 1934 | Box 2 \ 4 B002_X 127 128-page34 | |
| Schematic diagram of a helical gear gearbox arrangement for Isotta Fraschini. | 20th Oct 1936 | Box 2 \ 4 B002_X 127 128-page35 | |
| Blank page with a handwritten reference or page number in the top right corner. | 9th Jan 1933 | Box 2 \ 5 B002_X 131 135-page01 | |
| Design changes to differentiate the Peregrine model from the 25HP, focusing on coachwork and the instrument panel. | 9th Jan 1933 | Box 2 \ 5 B002_X 131 135-page02 | |
| Features and development of a new grouped instrument panel for the Peregrine. | 11th Jan 1933 | Box 2 \ 5 B002_X 131 135-page03 | |
| Suggestion to use the same improved scheme on both the Peregrine and 20/25 car models. | 11th Jan 1933 | Box 2 \ 5 B002_X 131 135-page04 | |
| Suggestions and requirements for a new instrument board panel design for both RR and Bentley cars. | 18th Feb 1933 | Box 2 \ 5 B002_X 131 135-page05 | |
| Review of design points concerning an outer frame, switchgear, and switchbox, with suggestions for improvement. | 18th Feb 1933 | Box 2 \ 5 B002_X 131 135-page06 | |
| Letter discussing a new design for a combined speedometer and tachometer with glass edge illumination. | 18th Feb 1933 | Box 2 \ 5 B002_X 131 135-page07 | |
| Blank page with the handwritten page number 135. | 1st Feb 1932 | Box 2 \ 5 B002_X 131 135-page08 | |
| Modifications to the Peregrine 2 accelerator pedal and related bodywork concerns. | 1st Feb 1932 | Box 2 \ 5 B002_X 131 135-page09 | |
| Technical memorandum regarding the addition of a spring washer to prevent clutch pedal oscillation on J.III and Peregrine models. | 15th Jul 1932 | Box 2 \ 5 B002_X 131 135-page10 | |
| Blueprint for a proposed fixed pedal support for the Peregrine. | 20th Jan 1933 | Box 2 \ 5 B002_X 131 135-page11 | |
| Suggestion to fit a felt washer to the circular stem for the Peregrine foot and clutch pedals. | 30th Dec 1932 | Box 2 \ 5 B002_X 131 135-page12 | |
| Confirming instructions for a felt washer to be fitted to the Peregrine pedal stem. | 2nd Jan 1933 | Box 2 \ 5 B002_X 131 135-page13 | |
| Method of removing rear axle taper nut. | 4th Feb 1912 | Box 2 \ 6 B002_X 140 141 157-page001 | |
| Sample report card demonstrating the filing system's common hole. | 4th Feb 1912 | Box 2 \ 6 B002_X 140 141 157-page002 | |
| Proposed experiment to measure the deflection of a bevel rear axle and its pinion under twist. | 4th Feb 1912 | Box 2 \ 6 B002_X 140 141 157-page003 | |
| With a diagram explaining how to carry out tests on bevel axles. | 4th Feb 1912 | Box 2 \ 6 B002_X 140 141 157-page004 | |
| From Mr. Royce detailing experiments for a quieter rear axle using different gear configurations. | 12th Feb 1912 | Box 2 \ 6 B002_X 140 141 157-page005 | |
| Rear axle gear ratios and a quote from Mr. Royce regarding a suggested alteration. | 1st Dec 1928 | Box 2 \ 6 B002_X 140 141 157-page006 | |
| The fitting of wider, coarser pitch gears to an axle for Mr. Royce's car, including his direct input. | 21th Feb 1912 | Box 2 \ 6 B002_X 140 141 157-page007 | |
| Record card for oil from a filter, noting aero ratio, coated components, and a 16-tooth pinion. | 18th Feb 1932 | Box 2 \ 6 B002_X 140 141 157-page008 | |
| Log report detailing issues with supports and engine behaviour under load. | 21th Feb 1912 | Box 2 \ 6 B002_X 140 141 157-page009 | |
| Choice of wider and coarser pitch gears to be fitted to an axle for Mr Royce's car. | 21th Feb 1912 | Box 2 \ 6 B002_X 140 141 157-page010 | |
| Instructions for rear axle gear ratios and pitch. | 21th Feb 1912 | Box 2 \ 6 B002_X 140 141 157-page011 | |
| To the Technical Committee regarding axle weight reduction and design improvements. | 5th Mar 1912 | Box 2 \ 6 B002_X 140 141 157-page012 | |
| From Mr. Royce detailing instructions to reduce the weight of axles. | 5th Mar 1912 | Box 2 \ 6 B002_X 140 141 157-page013 | |
| Directive from Mr. Royce to design an axle with a smaller bevel wheel to decrease its weight. | 5th Mar 1912 | Box 2 \ 6 B002_X 140 141 157-page014 | |
| Continued development and experimentation of axles to improve silence. | 7th Mar 1912 | Box 2 \ 6 B002_X 140 141 157-page015 | |
| Axle design focusing on strength, weight reduction, and competitor analysis. | 21th May 1923 | Box 2 \ 6 B002_X 140 141 157-page016 | |
| Gear design for back axles, focusing on over-run, and proposing experimental gear cutting methods. | 21th May 1923 | Box 2 \ 6 B002_X 140 141 157-page017 | |
| Modifications to an axle test rig to improve testing procedures and accuracy. | 28th Feb 1913 | Box 2 \ 6 B002_X 140 141 157-page018 | |
| The method of removing the rear axle tube nut. | 28th Feb 1913 | Box 2 \ 6 B002_X 140 141 157-page019 | |
| Experiment to find out why 20 pitch Axle is quieter than 5's. | 22th Jan 1912 | Box 2 \ 6 B002_X 140 141 157-page020 | |
| Log of reports and tests on 16+52 Axles with d's pitch. | 2nd Sep 1912 | Box 2 \ 6 B002_X 140 141 157-page021 | |
| Report card for an 18+50 Bevel Axle with 4'0 pitch, and axle teeth the same length as a 6'3 pitch. | 3rd Jul 1913 | Box 2 \ 6 B002_X 140 141 157-page022 | |
| Report card for an 18 x 52 axle with long addenda gear. | 24th Jun 1912 | Box 2 \ 6 B002_X 140 141 157-page023 | |
| Staffing for a lighter rear axle project. | 15th Apr 1912 | Box 2 \ 6 B002_X 140 141 157-page024 | |
| Details on a new, lighter back axle design, its adjustments, and strength compared to the 1906 pattern. | 18th Jun 1912 | Box 2 \ 6 B002_X 140 141 157-page025 | |
| Testing of a lighter rear axle and a delay in tackling the design of a new one. | 3rd May 1912 | Box 2 \ 6 B002_X 140 141 157-page026 | |
| Test results on standard and prototype rear axles to develop a lighter version. | 20th May 1912 | Box 2 \ 6 B002_X 140 141 157-page027 | |
| Departmental memo regarding a delay with rear axle driving dogs for the 2002 chassis. | 24th Jul 1912 | Box 2 \ 6 B002_X 140 141 157-page028 | |
| Index card detailing an adjusting rig for the rear axle support. | 14th Jun 1912 | Box 2 \ 6 B002_X 140 141 157-page029 | |
| Report from Mr Hives on the stiffness of new axle shafts with extra castleations. | 23th Sep 1912 | Box 2 \ 6 B002_X 140 141 157-page030 | |
| Mr Royce's impressions on the strength of a new experimental axle design. | 20th Sep 1912 | Box 2 \ 6 B002_X 140 141 157-page031 | |
| Mr. Royce's suggestions for the rear axle, instructing the replacement of 5/16' bolts with 3/8' bolts. | 3rd Oct 1912 | Box 2 \ 6 B002_X 140 141 157-page032 | |
| To Mr. Royce clarifying the design of special long nuts for axles. | 5th Nov 1912 | Box 2 \ 6 B002_X 140 141 157-page033 | |
| Departmental memo requesting an opinion on the new design for the adjustment of the pinion on the light rear axle for Chassis 2100E. | 2nd Dec 1912 | Box 2 \ 6 B002_X 140 141 157-page034 | |
| Self-light axle adjusting jig, noting it is an improvement on the present method. | 2nd Dec 1912 | Box 2 \ 6 B002_X 140 141 157-page035 | |
| Instruction note regarding a final setting process that can be done faster without measurement or a grinder. | 4th Dec 1912 | Box 2 \ 6 B002_X 140 141 157-page036 | |
| Special parts fitted to Chassis 2100E, focusing on the new lighter rear axle design and an adjusting jig. | 4th Dec 1912 | Box 2 \ 6 B002_X 140 141 157-page037 | |
| Weight comparison of a new design axle against the standard axle, noting a saving of 32 lbs. | 5th Dec 1912 | Box 2 \ 6 B002_X 140 141 157-page038 | |
| Response regarding steps to overcome rear axle vibration by developing a new axle with two sets of rear brakes. | 5th Dec 1912 | Box 2 \ 6 B002_X 140 141 157-page039 | |
| 'jaggering brake' issue on Series 2500 and 2600 vehicles. | 17th Jul 1925 | Box 2 \ 6 B002_X 140 141 157-page040 | |
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