| Description | Date | Identifier | |
| Cablegram to Mr. Hives about the performance of a new Pilot Jet and vaporising scheme. | 27th Oct 1921 | Box 50 \ 3 Scan199 | |
| Cablegram reporting the results of testing modified vaporiser pipes and a pilot jet for cold starting. | 27th Oct 1921 | Box 50 \ 3 Scan200 | |
| Blueprint for a 40/50 model exhaust heated throttle for use in existing induction pipes. | 19th Oct 1921 | Box 50 \ 3 Scan201 | |
| Modifications for the 40/50 HP Winter Carburation system, particularly regarding performance at full throttle when cold. | 3rd Nov 1921 | Box 50 \ 3 Scan202 | |
| Design control and coordination issues between the Derby and Springfield plants for cars in America. | 9th Nov 1921 | Box 50 \ 3 Scan203 | |
| And agreeing upon suggestions for winter starting in America. | 14th Nov 1921 | Box 50 \ 3 Scan204 | |
| Design improvements for a starting carburetter and throttle mechanism for the 40/50 model. | 1st Dec 1921 | Box 50 \ 3 Scan205 | |
| 'Dorris' petrol draining scheme for induction pipes and comparing it with other engine designs. | 16th Dec 1921 | Box 50 \ 3 Scan206 | |
| Testing and improvements for the 40/50 model, including cold starts with paraffin mixture. | 16th Dec 1921 | Box 50 \ 3 Scan207 | |
| Test report on engine power and fuel consumption using various percentages of paraffin mixtures. | 19th Dec 1921 | Box 50 \ 3 Scan208 | |
| Performance data tables showing RPM, Pounds, and Consumption at 35% and 40% settings. | 22th Dec 1921 | Box 50 \ 3 Scan209 | |
| Design points for an exhaust heated throttle and starting carburettor on a 40/50 chassis. | 22th Dec 1921 | Box 50 \ 3 Scan210 | |
| Modification to the exhaust heated throttle connection for easier assembly. | 28th Dec 1921 | Box 50 \ 3 Scan211 | |
| Modifications to an exhaust heated throttle, pilot jet, and the Goshawk 11 magneto control. | 29th Dec 1921 | Box 50 \ 3 Scan212 | |
| Magneto advance range for a 40/50 HP car and the finding of a Bendix Pinion. | 29th Dec 1921 | Box 50 \ 3 Scan213 | |
| Fitting an exhaust heated throttle to the 6.EX car and a meeting about a Goshawk chassis. | 9th Jan 1922 | Box 50 \ 3 Scan214 | |
| Inter-office correspondence regarding the use of vaporizer pipes without collector rings for induction. | 10th Jan 1922 | Box 50 \ 3 Scan215 | |
| Exhaust heated throttle, pilot jet, and associated controls for the 40/50 chassis. | 10th Jan 1922 | Box 50 \ 3 Scan216 | |
| Performance of a new starting equipment scheme and Exide batteries for Springfield production. | 10th Feb 1922 | Box 50 \ 3 Scan217 | |
| Letter regarding the difficulties of testing an exhaust-heated throttle on cars destined for Canada. | 4th Apr 1922 | Box 50 \ 3 Scan218 | |
| Fitting a new induction pipe arrangement on a 40/50 HP engine on the test bench. | 6th Jul 1922 | Box 50 \ 3 Scan219 | |
| Inter-office letter discussing the performance of a 'Hot Throttle' and the car's induction system. | 6th Jul 1922 | Box 50 \ 3 Scan220 | |
| Trial of an exhaust-heated throttle and potential issues with engine lubrication in cold conditions. | 25th Jul 1922 | Box 50 \ 3 Scan221 | |
| Carburation 'strong spot' issue caused by crude petrol congregating in cylinder inlet ports. | 25th Jul 1922 | Box 50 \ 3 Scan222 | |
| Potential carburation troubles due to crude petrol congregation in cylinder inlet port holes. | 26th Jul 1922 | Box 50 \ 3 Scan223 | |
| Bench tests of 40/50 induction pipes, detailing poor performance and proposed modifications. | 26th Jul 1922 | Box 50 \ 3 Scan224 | |
| Carburetter placement to mitigate fire risk, proposing a new scheme for the Hawk Northcliffe engine. | 27th Jul 1922 | Box 50 \ 3 Scan225 | |
| Letter discussing a carburation issue causing black smoke and seeking a solution for petrol pooling in inlet port holes. | 27th Jul 1922 | Box 50 \ 3 Scan226 | |
| Experimental carburetion schemes for Goshawk engines, with sketches of two arrangements. | 28th Jul 1922 | Box 50 \ 3 Scan227 | |
| Copy of a cable received from Mr. Platford at Springfield regarding car performance and travel arrangements. | 31th Jul 1922 | Box 50 \ 3 Scan228 | |
| Carburation issues, the 'Hot Spot' scheme, and related modifications at the American Factory. | 2nd Aug 1922 | Box 50 \ 3 Scan229 | |
| The Vaporiser Scheme and Pilot Jet used on American-made cars. | 18th Aug 1922 | Box 50 \ 3 Scan230 | |
| Carburation issues, comparing the Doris and Derby schemes, and recommending the adoption of a proven American pilot jet system. | 8th Aug 1922 | Box 50 \ 3 Scan231 | |
| Standardization of carburation features across English and American cars. | 1st Sep 1922 | Box 50 \ 3 Scan232 | |
| Standardisation of a vaporizer scheme on the induction pipe to avoid crankcase dilution. | 8th Sep 1922 | Box 50 \ 3 Scan233 | |
| Standardisation of an exhaust heated throttle and the value of superseded parts. | 14th Sep 1922 | Box 50 \ 3 Scan234 | |
| Test report on the 'Dorris scheme' hot spot throttle for car 49-GB to assess 'piling up'. | 3rd Oct 1922 | Box 50 \ 3 Scan235 | |
| Engine tests on a 49-GB car, focusing on induction pipe modifications and spark plug performance. | 5th Oct 1922 | Box 50 \ 3 Scan236 | |
| Standardisation of an exhaust heated throttle to improve running on low-grade petrol. | 8th Sep 1922 | Box 50 \ 3 Scan237 | |
| Disadvantages of the vaporiser scheme for the 40/50 chassis. | 1st Oct 1922 | Box 50 \ 3 Scan238 | |
| Limitations of an exhaust heated throttle and considerations for a vaporiser scheme. | 5th Oct 1922 | Box 50 \ 3 Scan239 | |
| Experiments and recommendations for modifying the engine's induction pipe and fuel distribution system. | 5th Oct 1922 | Box 50 \ 3 Scan240 | |
| Issues with a boiler, a vaporiser scheme, and adjustments to the pilot jet for cold starts. | 5th Oct 1922 | Box 50 \ 3 Scan241 | |
| Recommendation to continue with the exhaust heated throttle and not fit the vapouriser scheme until demand is proven. | 10th Oct 1922 | Box 50 \ 3 Scan242 | |
| Modifications to the 6-EX and other 40/50 models, specifically avoiding a vapouriser scheme. | 10th Oct 1922 | Box 50 \ 3 Scan243 | |
| Completion of a standardisation sheet for a vapouriser scheme on induction pipes. | 12th Oct 1922 | Box 50 \ 3 Scan244 | |
| The cost of a repair job to fit a vapouriser scheme to induction pipes. | 13th Oct 1922 | Box 50 \ 3 Scan245 | |
| Query regarding the application of a standardisation sheet for a Vaporiser on an Induction Pipe. | 20th Oct 1922 | Box 50 \ 3 Scan246 | |
| Standardisation of a vaporiser scheme for the induction pipe. | 25th Oct 1922 | Box 50 \ 3 Scan247 | |
| Instructions for conducting throttle distortion tests, detailing measurements taken before and after engine operation. | 12th Apr 1922 | Box 50 \ 3 Scan248 | |
| Instruction sheet recording multiple sets of measurements taken under hot and cold conditions. | 12th Nov 1922 | Box 50 \ 3 Scan249 | |
| Instruction sheet detailing measurements of throttle distortion under hot and cold conditions. | 13th Nov 1922 | Box 50 \ 3 Scan250 | |
| Test report on a stainless steel throttle piston's fit and dimensions under thermal stress. | 13th Nov 1922 | Box 50 \ 3 Scan251 | |
| Results of cold starting tests on a Derby Hot Throttle system. | 7th Dec 1922 | Box 50 \ 3 Scan252 | |
| Page 2 of a test report on the Derby Hot Throttle system, detailing performance on a Springfield car and comparing boiler capacities. | 27th Dec 1922 | Box 50 \ 3 Scan253 | |
| Procedure for standardizing the American chassis to be identical to the English chassis, including specific component concerns. | 27th Dec 1922 | Box 50 \ 3 Scan254 | |
| Ignition improvements, exhaust-heated throttles for cold weather, and modifications to induction pipes and carburetters. | 27th Dec 1922 | Box 50 \ 3 Scan255 | |
| Page discussing the patentability of a main throttle valve feature for its safety value. | 27th Dec 1922 | Box 50 \ 3 Scan256 | |
| Behaviour of the Hawk-Northcliffe induction pipe and proposing a simpler design for the Seagull engine. | 27th Dec 1922 | Box 50 \ 3 Scan257 | |
| Test report on two heat-treated 'Hot Spot Throttles' checking for distortion and sticking after a test run. | 29th Dec 1922 | Box 50 \ 3 Scan258 | |
| The implementation of a hot spot throttle for American procedures. | 13th Jan 1923 | Box 50 \ 3 Scan259 | |
| Technical memo discussing modifications to the exhaust choke valve control for the 40/50 chassis. | 22th Feb 1923 | Box 50 \ 3 Scan260 | |
| From GWH to Mr. Hives regarding testing on a diaphragm in hot spot throttles. | 23th Mar 1923 | Box 50 \ 3 Scan261 | |
| Test on a 49-GB car to prove the Dorris scheme with a hot-spot throttle. | 27th Mar 1923 | Box 50 \ 3 Scan262 | |
| Test report on the Dorris Scheme and hot-spot throttle for the 49-GB car. | 26th Mar 1923 | Box 50 \ 3 Scan263 | |
| Test results for the 49-GB car regarding the Dorris scheme and hot-spot throttle. | 10th Apr 1923 | Box 50 \ 3 Scan264 | |
| Tests on a 49-GB car to determine if the Dorris scheme is required with a hot-spot throttle by measuring collected petrol. | 11th Apr 1923 | Box 50 \ 3 Scan265 | |
| From Mr. Caswell to Mr. Olley concerning testing of the Derby Hot Throttle system on car 102-CE. | 22th May 1923 | Box 50 \ 3 Scan266 | |
| Letter discussing engine loading issues caused by vaporiser inlet pipes and the solution of fitting return pipes. | 22th May 1923 | Box 50 \ 3 Scan267 | |
| Report comparing an exhaust heated throttle with a draining scheme against the current induction system for performance. | 1st Sep 1921 | Box 50 \ 3 Scan268 | |
| Letter regarding the Springfield Vaporizer Scheme for induction pipes on the 40/50 Chassis, enclosing related drawings and reports. | 22th Jun 1923 | Box 50 \ 3 Scan269 | |
| Dynamometer tests of a hot throttle system for gas consumption, horsepower, and temperature. | 15th Jan 1924 | Box 50 \ 3 Scan270 | |
| Test report page detailing engine performance issues and potential improvements related to the throttle and induction pipe. | 15th Jan 1924 | Box 50 \ 3 Scan271 | |
| Performance test results table for a standard chassis, detailing horsepower, consumption, and temperatures at various RPMs. | 14th Jan 1924 | Box 50 \ 3 Scan272 | |
| Graph of Brake Horsepower at full throttle measured on a Springfield Traction Dynamometer, comparing three different exhaust configurations. | 14th Jan 1924 | Box 50 \ 3 Scan273 | |
| Graph comparing fuel consumption (pints per HP hour) against engine RPM under three different throttle and exhaust test conditions. | 14th Jan 1924 | Box 50 \ 3 Scan274 | |
| Blueprint graph of full throttle Brake Horsepower curves measured on a Springfield traction dynamometer. | 14th Jan 1924 | Box 50 \ 3 Scan275 | |
| Experiments with induction pipe heating on Phantom engines, comparing a standard hot spot choke valve with a pre-heated intake air system. | 26th Jun 1926 | Box 50 \ 3 Scan276 | |
| Comparison report on standard hot spot and preheated intake air engine systems. | 26th Jun 1926 | Box 50 \ 3 Scan277 | |
| Report page analyzing engine torque variation with intake air temperature, featuring a graph and test results. | 26th Jun 1926 | Box 50 \ 3 Scan278 | |
| Report analyzing the influence of fuel mixture strength on Mean Effective Pressure (M.E.P.), comparing standard hot spot heating with hot air only systems. | 26th Jun 1926 | Box 50 \ 3 Scan279 | |
| Analysis of the effects of high air temperature on engine power, economy, and consumption. | 26th Jun 1926 | Box 50 \ 3 Scan280 | |
| Graph showing the effect of different preheating methods on the power and efficiency of a Standard Phantom engine with a 4.1:1 compression ratio. | 26th Jun 1926 | Box 50 \ 3 Scan281 | |
| Report page detailing tests on heating engine intake air, its effect on performance and detonation, and comparing it to heating the induction bend. | 26th Jun 1926 | Box 50 \ 3 Scan282 | |
| The effects of hot air intake and compression ratios on engine performance and detonation. | 26th Jun 1926 | Box 50 \ 3 Scan283 | |
| Letter from Bleriot Limited offering their Beriot cutout and A.T. Speedometer for testing, with details on discounts and customisation. | 30th Dec 1920 | Box 50 \ 4 Scan001 | |
| Suggesting an experimental trial order of an A.T. Speedometer from Bleriot for the 'Kite' chassis. | 6th Jan 1922 | Box 50 \ 4 Scan002 | |
| Supply and required specifications for an A.T. Speedometer from Bleriot Ltd. for testing. | 6th Jan 1921 | Box 50 \ 4 Scan003 | |
| Request for information from Bleriot Ltd. on fitting a sample A.T. Speedometer to a Goshawk II chassis. | 17th Jan 1921 | Box 50 \ 4 Scan004 | |
| Letter from Bleriot Ltd. confirming a sample A.T. Speedometer has been sent for testing. | 28th Jan 1921 | Box 50 \ 4 Scan005 | |
| Letter from Blériot Limited chasing a previous request for information on speedometers. | 5th Feb 1921 | Box 50 \ 4 Scan006 | |
| Internal request for information regarding the test of a Bleriot A.T. Speedometer. | 6th Apr 1921 | Box 50 \ 4 Scan007 | |
| Quoting a follow-up letter from Bleriot Ltd. regarding a sample A.T. Speedometer sent for testing. | 25th May 1921 | Box 50 \ 4 Scan008 | |
| Follow-up letter regarding the testing of a Bleriot A.T. Speedometer. | 24th Jun 1921 | Box 50 \ 4 Scan009 | |
| Proposing the return of an unsuitable Bleriot A.T. speedometer that could not be tested. | 13th Jul 1921 | Box 50 \ 4 Scan010 | |
| Letter from Blériot Limited to Rolls-Royce Ltd concerning an A.T. Speedometer inquiry. | 26th Jul 1921 | Box 50 \ 4 Scan011 | |
| Letter to A.T. Speedometer Co. Ltd requesting prices for speedometers and specifying design requirements. | 21th Jul 1921 | Box 50 \ 4 Scan012 | |
| Inquiry regarding the test results for an A-T Speedometer forwarded by Messrs. Bleriot. | 1st Sep 1921 | Box 50 \ 4 Scan013 | |
| Follow-up letter requesting an opinion on A.T. Speedometers before accepting customer orders. | 10th Sep 1921 | Box 50 \ 4 Scan014 | |
| Inspection and potential use of an A.T. Speedometer for the 40/50 chassis. | 12th Sep 1921 | Box 50 \ 4 Scan015 | |
| | | | |
