| Description | Date | Identifier | |
| Superior quietness of Brown & Sharpe cut gears over generated gears for the 20HP chassis gearbox. | 1st Apr 1919 | Box 75 \ 1 scan0197 | |
| Modification to the front end of a gearbox for the 20 HP chassis to fit special Mitchelin wheels. | 9th Apr 1919 | Box 75 \ 1 scan0198 | |
| The manufacturing of special gears for the 20 HP Chassis Gear Box X356T. | 1st Apr 1919 | Box 75 \ 1 scan0199 | |
| Calculations for 20 HP chassis gears, including speeds, distances, and various gear ratios. | 12th Jun 1919 | Box 75 \ 1 scan0200 | |
| Table of gear ratios, engine revolutions, and dynamo revolutions at various speeds for the 20 HP chassis. | 13th Jun 1919 | Box 75 \ 1 scan0201 | |
| The receipt of various parts from different suppliers for specific experiments. | 17th May 1919 | Box 75 \ 1 scan0202 | |
| Confirming receipt of materials such as electrical steel, white metal, bulbs, and bearings from various suppliers. | 3rd Jun 1919 | Box 75 \ 1 scan0203 | |
| Sending two blueprints for the N.1345 L.O.P. 3-Speed Gear Box for a Goshawk chassis. | 20th Aug 1919 | Box 75 \ 1 scan0204 | |
| Engine and chassis development, covering the Condor, Goshawk, Vulture, and Buzzard, and a discussion on 6 versus 12-cylinder engines. | 15th Jan 1920 | Box 75 \ 1 scan0205 | |
| Alteration notice for an N.1 Gear Box, specifying the addition of a scrap section and metal to bosses. | 4th Mar 1920 | Box 75 \ 1 scan0206 | |
| Requesting an urgent alteration to the pattern for a Goshawk Gear Box casting for the Experimental Department. | 1st Mar 1920 | Box 75 \ 1 scan0207 | |
| Inspection notes and recommendations for various 20 HP chassis components. | 18th May 1920 | Box 75 \ 1 scan0208 | |
| Vibrations and gearbox noise experienced in the 'Goshawk' chassis. | 8th Jan 1921 | Box 75 \ 1 scan0209 | |
| Design proposals for a new small chassis, including engine and construction options. | 17th Nov 1920 | Box 75 \ 1 scan0210 | |
| Specifications for a small chassis, detailing the gearbox, back axle, and related components. | 17th Nov 1920 | Box 75 \ 1 scan0211 | |
| Modifications to the small R.R. chassis specification, including changes to the clutch, gearbox, and couplings. | 23th Nov 1920 | Box 75 \ 1 scan0212 | |
| Wear on plate clutches and gearboxes, referencing a Packard and proposing a new 'Goshawk' design. | 23th Nov 1920 | Box 75 \ 1 scan0213 | |
| Design and potential issues of the 'KITE' gearbox and clutch. | 14th Dec 1920 | Box 75 \ 1 scan0214 | |
| Design updates for the Goshawk II engine, including the gearbox, back axle, cylinder head, and ignition system. | 18th Jan 1921 | Box 75 \ 1 scan0215 | |
| Drawing LeC.1349 for additions to the 'Goshawk 11' gearbox hand brake mechanism. | 10th Dec 1930 | Box 75 \ 1 scan0216 | |
| Confirming the sending of blueprints for Goshawk 11 clutch, flywheel, and gearbox components. | 28th Feb 1921 | Box 75 \ 1 scan0217 | |
| The reduction ratios for the 'Goshawk II' gearbox. | 5th Mar 1921 | Box 75 \ 1 scan0218 | |
| Modifications to the Goshawk 11 gearbox, specifically concerning the motion shaft and a bolt. | 17th Mar 1921 | Box 75 \ 1 scan0219 | |
| Extract from a visit report concerning a trial on a Goshawk 11 gearbox. | 31th Mar 1921 | Box 75 \ 1 scan0220 | |
| Cost reduction proposals for the Goshawk II Gearbox control levers. | 19th Apr 1921 | Box 75 \ 1 scan0221 | |
| Responding to design suggestions for the Goshawk 11 Gear Box. | 25th Apr 1921 | Box 75 \ 1 scan0222 | |
| The design and testing of a stud arrangement for fixing the Goshawk II gear box brake quadrant. | 27th Apr 1921 | Box 75 \ 1 scan0223 | |
| Discrepancy and subsequent alteration to the 'Goshawk II' transmission line, requiring new blueprints to be issued. | 10th May 1921 | Box 75 \ 1 scan0224 | |
| The lack of a method to check the oil level in the Goshawk 11 gear box. | 21th Jul 1921 | Box 75 \ 1 scan0225 | |
| The initial test run impressions of the 'Goshawk 11' engine and gear units. | 22th Jul 1921 | Box 75 \ 1 scan0226 | |
| The inspection and filler plugs for the Goshawk 11 Gear Box. | 4th Aug 1921 | Box 75 \ 1 scan0227 | |
| Telegram from Royce regarding a meeting and trial of Goshawk engine gears for Rowledge and Olliver. | 31th Aug 1932 | Box 75 \ 1 scan0228 | |
| Use of 20° versus 14½° angle teeth in the Goshawk 11 gearbox. | 3rd Sep 1921 | Box 75 \ 1 scan0229 | |
| Gear design for the Goshawk 11 gearbox, discussing tooth obliquity, interference, and noise. | 7th Sep 1921 | Box 75 \ 1 scan0230 | |
| Failed valve spring washer and excessive engine gear noise on the Goshawk 11 engine, recommending an oil system modification. | 13th Sep 1921 | Box 75 \ 1 scan0231 | |
| Testing a Goshawk engine and gearbox to investigate clutch jaggering issues. | 13th Sep 1921 | Box 75 \ 1 scan0232 | |
| Investigating noise from a Goshawk 11 gearbox, questioning the reverse pinion or ball bearings as the cause. | 9th Sep 1921 | Box 75 \ 1 scan0233 | |
| Test report on Goshawk 11 and Gear Box X.4247, identifying a noisy Hyatt roll bearing as the cause of a fault. | 20th Sep 1921 | Box 75 \ 1 scan0234 | |
| Extract about gearbox noise and the results of replacing a Hyatt Bearing with a plain bush. | 23th Sep 1921 | Box 75 \ 1 scan0235 | |
| 20 HP gearbox retaining bolt failure during test bench trials. | 13th Oct 1921 | Box 75 \ 1 scan0236 | |
| Test report on a gearbox bolt failure, steering rigidity, and causes of induction roar. | 13th Oct 1921 | Box 75 \ 1 scan0237 | |
| Broken bolt on the Goshawk 11 gearbox and proposed solutions. | 17th Oct 1921 | Box 75 \ 1 scan0238 | |
| Extract concerning a noisy Hyatt roller bearing on a gearbox and the implications of bearing fit. | 17th Oct 1921 | Box 75 \ 1 scan0239 | |
| Failure of a 2.BA bolt in the Goshawk 11 gearbox, which could lead to the selector tube sliding into the clutch. | 26th Oct 1931 | Box 75 \ 1 scan0240 | |
| The use of Hoffmann roller bearings in a Goshawk II gearbox and a proposed test for a broken side shaft bolt. | 27th Oct 1921 | Box 75 \ 1 scan0241 | |
| Goshawk Gear Box drain plug dimensions and a request for a new drawing sheet. | 11th Nov 1921 | Box 75 \ 1 scan0242 | |
| Drawing for a strengthened method of holding the slider guides for the Goshawk 11 Gear Box. | 11th Nov 1921 | Box 75 \ 1 scan0243 | |
| The arrival and planned testing of special roller bearings for the Goshawk 11 gearbox. | 18th Nov 1921 | Box 75 \ 1 scan0244 | |
| Note on gearbox faults, including a double note sound and top gear slipping. | 30th Nov 1921 | Box 75 \ 1 scan0245 | |
| Cause and solution for oil leaks from the Goshawk gearbox. | 14th Dec 1921 | Box 75 \ 1 scan0246 | |
| Modifications to address oil leaks from a COS gearbox, referencing drawings LeC.1508 and LeC.1509. | 22th Dec 1921 | Box 75 \ 1 scan0247 | |
| Production startup points for the Goshawk 11 chassis, focusing on the gearbox casting, dashboard supports, brake shaft stress, and pedal stops. | 30th Dec 1921 | Box 75 \ 1 scan0248 | |
| Suggested gearbox breather for the Goshawk 11, intended to fix oil leaks and rust issues. | 8th May 1922 | Box 75 \ 1 scan0249 | |
| Modification to the Goshawk 11 gearbox cover bolts. | 5th May 1922 | Box 75 \ 1 scan0250 | |
| Drawing No. Lec.1586 for an improved ventilation system for the Goshawk 11 gearbox. | 23th May 1922 | Box 75 \ 1 scan0251 | |
| Alteration of the second speed gear ratio for the Goshawk II gearbox. | 31th May 1922 | Box 75 \ 1 scan0252 | |
| Lubrication of a Goshawk limousine due to a noisy second speed caused by low gearbox oil. | 1st Jun 1922 | Box 75 \ 1 scan0253 | |
| Testing the Goshawk 11 gearbox vent, which resulted in oil leakage from tubes due to emulsion. | 9th Jun 1922 | Box 75 \ 1 scan0254 | |
| Tests conducted to investigate the cause of an elusive engine gear rattle. | 9th Sep 1922 | Box 75 \ 1 scan0255 | |
| Investigation into the cause of Goshawk II engine gear and dynamo rattles. | 16th Sep 1922 | Box 75 \ 1 scan0256 | |
| Continued note regarding an agreement from the Drawing Office about a Goshawk-11 plate modification. | 23th Nov 1922 | Box 75 \ 1 scan0257 | |
| Letter discussing gear levers on the 20 HP model, loss of sales due to left-hand control, and potential improvements for colonial markets. | 23th Nov 1922 | Box 75 \ 1 scan0258 | |
| Request for a Goshawk engine and gearbox unit to be returned in good repair before the handover of a 6-Goshawk-ll car. | 24th Nov 1922 | Box 75 \ 1 scan0259 | |
| Proposed new fan drive arrangement for the Goshawk engine and its potential consequences. | 1st Dec 1922 | Box 75 \ 1 scan0260 | |
| Proposal for a friction drive system using bevelled rings to ensure quiet engine gear operation. | 12th Dec 1922 | Box 75 \ 1 scan0261 | |
| Continued page discussing the implications of using tight gears and thick oil. | 10th Jan 1923 | Box 75 \ 1 scan0262 | |
| The standardisation of the Goshawk Gearbox. | 10th Jan 1923 | Box 75 \ 1 scan0263 | |
| Drawing of a Goshawk II gearbox with speed ratio calculations. | 9th Mar 1923 | Box 75 \ 1 scan0264 | |
| Test report detailing transmission loss on direct and indirect gears due to oil churning and inefficiency. | 15th Mar 1923 | Box 75 \ 1 scan0265 | |
| Continued list of conclusions drawn from apparatus tests, detailing issues with sensitivity, gearbox performance, and brake measurement errors. | 26th Mar 1923 | Box 75 \ 1 scan0266 | |
| Issues with the top gear and bonnet fit, attributing past occurrences to faulty workmanship. | 26th Mar 1923 | Box 75 \ 1 scan0267 | |
| Concerning a potential design or workmanship fault causing the top gear to slip on Goshawk models. | 28th Mar 1923 | Box 75 \ 1 scan0268 | |
| Official order for work to be carried out on a 7-Goshawk-11 car. | 17th Apr 1923 | Box 75 \ 1 scan0269 | |
| Request for an official order to dismantle a gearbox and fit a trunnion ball race on a 20 HP Experimental chassis. | 9th Apr 1923 | Box 75 \ 1 scan0270 | |
| Table of engine revolutions at various road speeds for different axle types, with a secondary table for Goshawk 11 gear reduction ratios. | 4th May 1923 | Box 75 \ 1 scan0271 | |
| The top gear disengaging while running on 20-HP chassis models. | 24th May 1923 | Box 75 \ 1 scan0272 | |
| Increasing the strength of the locking spring for the 20HP chassis gearbox change gear mechanism. | 25th May 1923 | Box 75 \ 1 scan0273 | |
| Investigation into the top gear disengaging on a 20-HP chassis, citing faulty gearbox alignment. | 29th May 1923 | Box 75 \ 1 scan0274 | |
| Gearbox alignment issue on the 20HP chassis and a proposed solution. | 1st Jun 1923 | Box 75 \ 1 scan0275 | |
| 20-HP engine gear failures caused by insufficient flywheel clearance on experimental and new cars. | 7th Jun 1923 | Box 75 \ 1 scan0276 | |
| 20-HP engine gear failure caused by an unlocked nut on the front camshaft bearing housing. | 2nd Jul 1923 | Box 75 \ 1 scan0277 | |
| Sending drawing No.Lec.1751 for the Goshawk side change gearbox casing and requesting a print. | 25th Aug 1923 | Box 75 \ 1 scan0278 | |
| Sending drawing No. LeC.1755, which shows an improved type of outside lever on a Goshawk clutch operating shaft. | 30th Aug 1923 | Box 75 \ 1 scan0279 | |
| The improved Goshawk 11 clutch operating gear to suit a side change gearbox. | 30th Sep 1923 | Box 75 \ 1 scan0280 | |
| Gearbox design for the Goshawk model to support side levers and 4-wheel brakes. | 16th Oct 1923 | Box 75 \ 1 scan0281 | |
| Urgent need to introduce a new gearbox with side levers for the 20HP Chassis. | 18th Dec 1923 | Box 75 \ 1 scan0282 | |
| Private memo regarding the urgent need to proceed with the new Gear Box for the 20HP chassis. | 18th Dec 1923 | Box 75 \ 1 scan0283 | |
| Extract discussing considerations for a 3-speed versus 4-speed gearbox design for the Goshawks model. | 1st Jan 1924 | Box 75 \ 1 scan0284 | |
| Meeting notes from the design committee regarding the EAC.3 chassis steering lock and front springs. | 8th Jan 1924 | Box 75 \ 1 scan0285 | |
| Decisions on 20 HP model brakes, frame length, gearbox, and patents. | 16th Jan 1924 | Box 75 \ 1 scan0286 | |
| Secret memo outlining progress at West Wittering and clarifying the nomenclature for various 'EAC' chassis designs. | 16th Jan 1924 | Box 75 \ 1 scan0287 | |
| Status report on various experimental car models, gearboxes, and component issues. | 22th Jan 1924 | Box 75 \ 1 scan0288 | |
| Estimate of the extra weight and cost for a four-speed Goshawk gearbox compared to a three-speed version. | 22th Jan 1924 | Box 75 \ 1 scan0289 | |
| 20 HP right-hand change gearbox, noting noise issues and a problem with the selector rod bushes. | 28th Feb 1924 | Box 75 \ 1 scan0290 | |
| On the performance and silence of a 20 HP gearbox with right-hand brake and change speed levers. | 2nd Feb 1924 | Box 75 \ 1 scan0291 | |
| Forwarding a telegram from Mr. Royce with suggestions for a new gearbox scheme. | 11th Feb 1924 | Box 75 \ 1 scan0292 | |
| Decision to postpone the manufacture of a four-speed gearbox for the 20 HP chassis due to cost. | 1st May 1924 | Box 75 \ 1 scan0293 | |
| 20 HP gearbox with right-hand levers. | 10th Mar 1924 | Box 75 \ 1 scan0294 | |
| Continuation of a note regarding modifications to the gate and springs on a Hawk gearbox. | 21th Mar 1924 | Box 75 \ 1 scan0295 | |
| Draught from the 40/50 HP gearbox freezing the driver's right leg. | 21th Mar 1924 | Box 75 \ 1 scan0296 | |
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