| Description | Date | Identifier | |
| Faults and proposed solutions for wiring, starter motor pinions, and rocker cover fixings. | 28th Mar 1935 | Box 25 \ 1 Scan033 | |
| Order from the War Office for 50 20/25 HP engines and fittings for tanks. | 31th Oct 1932 | Box 25 \ 1 Scan034 | |
| Contract for 50 engines for a Light Tank and unresolved issues with the War Office regarding screening specifications. | 8th Dec 1932 | Box 25 \ 1 Scan035 | |
| Request for a contract to cover the immediate production of a modified set for parallel testing. | 8th Dec 1932 | Box 25 \ 1 Scan036 | |
| Tests conducted on an air intake silencer for a 25 HP car, including sketches of the modifications. | 2nd Jan 1933 | Box 25 \ 1 Scan037 | |
| Development and fitting of an air silencer, including a dimensioned sketch. | 3rd Jan 1933 | Box 25 \ 1 Scan038 | |
| Tests on the air silencer for the 20/25 HP, noting a power drop and suggesting a modification. | 3rd Jan 1933 | Box 25 \ 1 Scan039 | |
| Performance curves for a tank carburetter under various configurations. | 14th Feb 1932 | Box 25 \ 1 Scan040 | |
| Cover page with a 'Print Room' stamp. | 3rd Jan 1933 | Box 25 \ 1 Scan041 | |
| Crankshaft specifications for left-hand Phantom engines to be used in tanks. | 28th Aug 1933 | Box 25 \ 1 Scan042 | |
| Providing revised inertia and frequency figures for 40/50 engines used in tanks. | 1st Sep 1933 | Box 25 \ 1 Scan043 | |
| Water flow test results for the Phantom II Tank Engine. | 2nd Nov 1933 | Box 25 \ 1 Scan044 | |
| Blueprint detailing a water flow test for a PH. II L.H. Tank Engine. | 30th Oct 1933 | Box 25 \ 1 Scan045 | |
| Issues and proposed modifications for a tank engine's starting handle shaft and a sticking air valve. | 28th Mar 1935 | Box 25 \ 1 Scan046 | |
| Report card detailing the fitting and testing of extra bonnet clips. | 11th May 1912 | Box 25 \ 1 Scan047 | |
| Departmental memo discussing a modification from two to three spring clips on the bonnet to prevent rattling. | 20th Jun 1912 | Box 25 \ 1 Scan048 | |
| Instructions for fitting extra clips on experimental car bonnets. | 29th Jun 1912 | Box 25 \ 1 Scan049 | |
| Record card detailing the fitting of Bonnet Tongues, part number E 2720. | 26th Sep 1912 | Box 25 \ 1 Scan050 | |
| Bonnet clips, relaying a report from Hives recommending new standard parts and noting Mr. Royce's opinion. | 25th Sep 1912 | Box 25 \ 1 Scan051 | |
| Experiment regarding a bonnet clip, initiated by a suggestion to create and test a sample set. | 26th Aug 1913 | Box 25 \ 1 Scan052 | |
| Extract discussing an experiment with bonnet clips designed not to scratch frame strips, which has been incorporated into universal bonnets. | 31th Dec 1913 | Box 25 \ 1 Scan053 | |
| Request to produce designs for a sample bonnet clip set, referencing an attached suggestion. | 31th Dec 1913 | Box 25 \ 1 Scan054 | |
| Vibrating bonnets and the potential strengthening of spring clips. | 4th Feb 1914 | Box 25 \ 1 Scan055 | |
| Internal correspondence regarding the standardization of a new bonnet design due to closing difficulties. | 5th Feb 1914 | Box 25 \ 1 Scan056 | |
| Internal query asking for an opinion on the bonnet clips fitted to chassis 2704 compared to standard fittings. | 7th Feb 1914 | Box 25 \ 1 Scan057 | |
| Request for an opinion on the satisfaction of bonnet clips fitted to car 2704 compared to standard cars. | 9th Feb 1914 | Box 25 \ 1 Scan058 | |
| Follow-up request for a reply to a memo concerning bonnet clips on Chassis 2704. | 4th Feb 1914 | Box 25 \ 1 Scan059 | |
| Departmental memo regarding the urgency of experiments, requesting more information on a bonnet clip design. | 16th Feb 1914 | Box 25 \ 1 Scan060 | |
| To Mr Hives requesting an opinion on bonnet clips fitted to car 2704. | 17th Feb 1914 | Box 25 \ 1 Scan061 | |
| Delayed reply about bonnet clips caused by it being incorrectly addressed. | 17th Feb 1914 | Box 25 \ 1 Scan062 | |
| The correspondence history regarding a design for non-scratching bonnet clips. | 26th Jan 1914 | Box 25 \ 1 Scan063 | |
| Chasing an outstanding report on bonnet clips for model 2704. | 28th Feb 1914 | Box 25 \ 1 Scan064 | |
| Following up on a delayed report concerning bonnet clips fitted to vehicle 2704. | 5th Mar 1914 | Box 25 \ 1 Scan065 | |
| To Mr. Hives regarding a failure to reply to correspondence about 'Bonnet Clips'. | 17th Mar 1914 | Box 25 \ 1 Scan066 | |
| Testing a new type of bonnet and bonnet clips. | 17th Mar 1914 | Box 25 \ 1 Scan067 | |
| Opinion on new bonnet clips, with a handwritten reply. | 10th Feb 1914 | Box 25 \ 1 Scan068 | |
| Correspondence regarding the ineffectiveness of new bonnet clips to prevent vibration or ease opening. | 19th Mar 1914 | Box 25 \ 1 Scan069 | |
| The modification of the X695 bonnet clip for the latest 24° Universal Radiator and Bonnet. | 21th Mar 1914 | Box 25 \ 1 Scan070 | |
| Experiment to measure the load on bonnet catch springs to address difficulty in opening the bonnet. | 12th Jan 1915 | Box 25 \ 1 Scan071 | |
| Weight figures for bonnets to resolve issues with stiff bonnet springs. | 12th Jan 1915 | Box 25 \ 1 Scan072 | |
| Information about bonnet catch springs that may require modification. | 6th Feb 1915 | Box 25 \ 1 Scan073 | |
| Report on the weight capacity and quantity of bonnet catch springs. | 9th Feb 1915 | Box 25 \ 1 Scan074 | |
| The modification of bonnet catch springs for chassis 49 GB. | 11th Feb 1915 | Box 25 \ 1 Scan075 | |
| Inquiry about the readiness of bonnet catch springs for chassis 49 GB for inspection and trial. | 20th Feb 1915 | Box 25 \ 1 Scan076 | |
| Instruction note confirming the bonnet latch springs on chassis 49GB are ready for inspection after adjustment. | 23th Feb 1915 | Box 25 \ 1 Scan077 | |
| Requesting the weight of the altered universal bonnet springs. | 3rd Mar 1915 | Box 25 \ 1 Scan078 | |
| Requesting a reply regarding universal bonnet springs. | 15th Mar 1915 | Box 25 \ 1 Scan079 | |
| Positioning of bonnet clips and Mr. Royce's preference for testing a new catch before production changes. | 27th Aug 1919 | Box 25 \ 1 Scan080 | |
| Re-fitting bonnet fasteners closer together for improved usability and operation. | 28th Aug 1919 | Box 25 \ 1 Scan081 | |
| Sending two blueprints for a 40/50 Chassis rear bonnet fastener to have a model set made for approval. | 17th Oct 1919 | Box 25 \ 1 Scan082 | |
| Blue Prints and experimental numbers for bonnet fastener catches on various schemes. | 24th Oct 1919 | Box 25 \ 1 Scan083 | |
| Fitting of experimental parts to specific chassis. | 10th Dec 1919 | Box 25 \ 1 Scan084 | |
| Completion and supercedence of several experimental parts. | 23th Dec 1919 | Box 25 \ 1 Scan085 | |
| List of new parts fitted and modifications made to a car for a 10,000-mile run. | 1st Jan 1920 | Box 25 \ 1 Scan086 | |
| The 10,000-mile test of the 2EX chassis, detailing a battery issue and a list of parts for standardisation. | 9th Apr 1920 | Box 25 \ 1 Scan087 | |
| Suggested design changes for the bonnet lock, referencing a letter from America. | 13th Aug 1920 | Box 25 \ 1 Scan088 | |
| Letter suggesting design changes to the bonnet, including adding lifting handles and a lock. | 31th Jul 1920 | Box 25 \ 1 Scan089 | |
| Suitability of locks for American use and a proposal to standardize with Yale locks. | 19th Nov 1920 | Box 25 \ 1 Scan090 | |
| Testing of new suggestions for bonnet catches. | 19th Nov 1920 | Box 25 \ 1 Scan091 | |
| Letter from the American branch proposing a modification to the bonnet catches to prevent rattling and improve handling. | 29th Oct 1920 | Box 25 \ 1 Scan092 | |
| Springfield's insistence on having handles for bonnets on cars for America. | 6th Jul 1921 | Box 25 \ 1 Scan093 | |
| Extract regarding bonnet handles for American cars, noting the issue has been raised with Mr. Royce. | 6th Jul 1921 | Box 25 \ 1 Scan094 | |
| Letter confirming the dispatch of 'BIM' bonnet fasteners, an invoice, and fitting pamphlets. | 30th Aug 1924 | Box 25 \ 1 Scan095 | |
| Assembly instructions for the BIM bonnet fastener, in French. | 28th Aug 1924 | Box 25 \ 1 Scan096 | |
| French language advertisement leaflet for a 'BIM' bonnet latch, complete with illustrations. | 8th Jan 1927 | Box 25 \ 1 Scan097 | |
| Design and necessary improvements for bonnet fittings, clips, and locks on various car models. | 8th Jan 1927 | Box 25 \ 1 Scan098 | |
| Alternative schemes and design details for a bonnet lock for the 40/50 and 20 HP models. | 3rd Jan 1927 | Box 25 \ 1 Scan099 | |
| Design details for a gear wheel, pin connections, and bonnet fasteners, referencing associated sketches. | 6th Jan 1927 | Box 25 \ 1 Scan100 | |
| Design improvements for bonnet clips and overall bonnet aesthetics, weighing style against practical constraints. | 6th Jan 1927 | Box 25 \ 1 Scan101 | |
| Trials for a novel bonnet fastener and a new lock. | 22th Mar 1927 | Box 25 \ 1 Scan102 | |
| Decision to proceed with detailing a new Phantom bonnet lock design. | 28th Mar 1927 | Box 25 \ 1 Scan103 | |
| The detailing of Phantom bonnet locks. | 1st Apr 1927 | Box 25 \ 1 Scan104 | |
| Modifications to the Phantom bonnet catch and a query about a missing polished strip on the 20 HP model. | 10th Sep 1927 | Box 25 \ 1 Scan105 | |
| Addition of a polished strip to the 20 HP bonnet for improved appearance. | 12th Sep 1927 | Box 25 \ 1 Scan106 | |
| Querying the status and suitability of a new design for 'SS' and G.4. bonnet fasteners and locks. | 6th Nov 1928 | Box 25 \ 1 Scan107 | |
| Loss of knobs from push-type bonnet catches during tests, proposing a new locking device. | 13th Aug 1929 | Box 25 \ 1 Scan108 | |
| Introduction of an improved bonnet lock and the deletion of the standard version. | 28th May 1930 | Box 25 \ 1 Scan109 | |
| Standardisation of an improved type of bonnet lock to overcome complaints. | 17th Dec 1929 | Box 25 \ 1 Scan110 | |
| Requesting the production of 8 spring plates to prevent rattles on bar type bonnet locks. | 3rd Nov 1931 | Box 25 \ 1 Scan111 | |
| Bonnet movement issues and the performance of Vaughan bonnet locks, suggesting an improved bar type lock. | 5th Nov 1931 | Box 25 \ 1 Scan112 | |
| Issues with bonnet locks and fastenings and suggesting a modification. | 23th Nov 1931 | Box 25 \ 1 Scan113 | |
| Complaint of battered and worn aluminium edges on the bonnet locks of several cars. | 24th Nov 1931 | Box 25 \ 1 Scan114 | |
| Complaints of bonnet lock wear on the Phantom II, discussing various lock types and solutions. | 26th Nov 1931 | Box 25 \ 1 Scan115 | |
| Bonnets for the 129-GN London Trials 40/50 HP vehicle. | 27th Nov 1931 | Box 25 \ 1 Scan116 | |
| Potential issue with 40/50 HP bonnets and a proposed modification to the locks. | 26th Nov 1931 | Box 25 \ 1 Scan117 | |
| Proposal to change from the standard Yale bonnet lock to an R's Bar type lock on the 40/50 HP chassis. | 9th Dec 1931 | Box 25 \ 1 Scan118 | |
| Whether to fit new bar type bonnet locks or retain Yale locks on 40/50 HP chassis. | 15th Jan 1932 | Box 25 \ 1 Scan119 | |
| Enquiries be made to potential suppliers of bonnet fasteners. | 1st Jan 1932 | Box 25 \ 1 Scan120 | |
| Suitability and issues with different bonnet locks, comparing the Vaughan lock to a bar-type lock for P.2. chassis. | 19th Jan 1932 | Box 25 \ 1 Scan121 | |
| Query regarding a price discrepancy for Phantom II bonnet locks. | 21th Jan 1932 | Box 25 \ 1 Scan122 | |
| Internal memorandum regarding confusion over cost figures for bonnet locks. | 23th Jan 1932 | Box 25 \ 1 Scan123 | |
| Feedback on various types of bonnet fasteners from different suppliers. | 5th Feb 1932 | Box 25 \ 1 Scan124 | |
| Request for confirmation of verbally quoted costs for bonnet fasteners, which seem high. | 20th Feb 1932 | Box 25 \ 1 Scan125 | |
| Suitability of Vaughan locks versus bar type locks for the bonnet on the 20/25 chassis. | 22th Feb 1932 | Box 25 \ 1 Scan126 | |
| Confirming the factory costs and savings related to bonnet fasteners for the Phantom II and 20/25 HP models. | 23th Feb 1932 | Box 25 \ 1 Scan127 | |
| The decision not to standardise the Bar Type bonnet lock for the 25 HP model. | 26th Feb 1932 | Box 25 \ 1 Scan128 | |
| Dispatching one pair of bonnet locks to Mr. Bellringer for car 19-G4. | 25th Jul 1932 | Box 25 \ 1 Scan129 | |
| Cost, manufacturing process, and standardization of bonnet fasteners. | 2nd Sep 1932 | Box 25 \ 1 Scan130 | |
| Urgent internal memo requesting instructions for fitting bonnet locks to J.3. | 3rd Sep 1932 | Box 25 \ 1 Scan131 | |
| Internal request to obtain a sample of Amal bonnet fasteners. | 6th Sep 1932 | Box 25 \ 1 Scan132 | |
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