| Description | Date | Identifier | |
| Issues with automatic carburettors and suggestions for improving their design for easier fault diagnosis. | 25th Apr 1935 | Box 122 \ 4 scan0075 | |
| Inquiring about starting troubles, comparing the ease of starting American cars like Packard without warming up, in relation to automatic carburettors. | 1st May 1935 | Box 122 \ 4 scan0076 | |
| Letter to A. Blundell Esq. inquiring about a patented Air Silencer and Cleaner for a Stromberg carburetter. | 28th Jun 1935 | Box 122 \ 4 scan0077 | |
| Letter from A. Blundell requesting engine specifications in order to supply a sample air silencer. | 2nd Jul 1935 | Box 122 \ 4 scan0078 | |
| Letter from the Experimental Department responding to queries about engine specifications and intake noise. | 5th Jul 1935 | Box 122 \ 4 scan0079 | |
| Letter from A. Blundell confirming an air silencer is being made and will be dispatched. | 10th Jul 1935 | Box 122 \ 4 scan0080 | |
| Letter from Speedwell Gear Case Co. Ltd. regarding a sample Blundell Air Silencer sent for testing. | 24th Jul 1935 | Box 122 \ 4 scan0081 | |
| Letter from Speedwell Gear Case Co. regarding samples of a Blundell Air Silencer and a new one for a Double '6' Engine. | 13th Sep 1935 | Box 122 \ 4 scan0082 | |
| Letter to Mr. B.S. Winter of Humber Ltd. confirming a meeting arrangement. | 7th Feb 1936 | Box 122 \ 4 scan0083 | |
| Letter to W.E. Rootes proposing a meeting to discuss shared problems with downdraught carburetters. | 25th Feb 1936 | Box 122 \ 4 scan0084 | |
| Letter from R.C. Rootes to W.A. Robotham acknowledging correspondence and arranging a meeting in Coventry about carburettors. | 27th Feb 1936 | Box 122 \ 4 scan0085 | |
| Letter to R.C. Rootes regarding a factory visit. | 28th Feb 1936 | Box 122 \ 4 scan0086 | |
| Letter from Humber Ltd. to W.A. Robotham discussing potential collaboration on carburation and a new motor-driven hydraulic pump. | 28th Feb 1936 | Box 122 \ 4 scan0087 | |
| Letter to B.S. Winter of Messrs. Humber Ltd. arranging a meeting in Coventry to discuss carburettors. | 5th Mar 1936 | Box 122 \ 4 scan0088 | |
| Letter from Humber Ltd. arranging a lunch meeting with Mr. Rowbotham. | 6th Mar 1936 | Box 122 \ 4 scan0089 | |
| Letter to G. McClure of The Riley Motor Co. Ltd. confirming a meeting at the Riley Works. | 10th Mar 1936 | Box 122 \ 4 scan0090 | |
| Letter to B.S. Winter of Humber Ltd., thanking him for a pleasant day spent together. | 12th Mar 1936 | Box 122 \ 4 scan0091 | |
| Letter to R.C. Rootes following a visit to the Humber Factory and inviting him to Derby. | 12th Mar 1936 | Box 122 \ 4 scan0092 | |
| Letter to Amal Ltd. requesting a loan of six motorcycle carburetters for an experiment. | 13th Mar 1936 | Box 122 \ 4 scan0093 | |
| Return of loaned Amal T.T. type Carburetters to Rudge-Whitworth Ltd. | 16th Mar 1936 | Box 122 \ 4 scan0094 | |
| Letter to Messrs. Rudge-Whitworth Ltd. returning five loaned Amal Carburetters that were not large enough for their engine. | 17th Mar 1936 | Box 122 \ 4 scan0095 | |
| Letter from carburetter manufacturer AMAL Ltd. regarding the supply of TT35 type carburetters. | 17th Mar 1936 | Box 122 \ 4 scan0096 | |
| Letter from Amal Limited regarding the dispatch of six carburettors, one of which is faulty due to a crack. | 19th Mar 1936 | Box 122 \ 4 scan0097 | |
| Letter from carburetter manufacturer AMAL LTD. regarding a replacement part for a faulty carburetter body. | 27th Mar 1936 | Box 122 \ 4 scan0098 | |
| Letter to Amal Ltd. concerning a lost letter and damaged carburetter parts received. | 28th Mar 1936 | Box 122 \ 4 scan0099 | |
| Letter from AMAL Ltd. clarifying that a complimentary sample push-pull control is unrelated to carburettors. | 30th Mar 1936 | Box 122 \ 4 scan0100 | |
| Letter from Gladwell & Kell Ltd. introducing their new G.U.C. updraught carburettor. | 14th Apr 1936 | Box 122 \ 4 scan0101 | |
| Letter to Gladwell & Kell Ltd. declining to test their Gladwell Updraught Carburetter. | 17th Apr 1936 | Box 122 \ 4 scan0102 | |
| The front cover of a promotional brochure for a patented product called 'CUC'. | 17th Apr 1936 | Box 122 \ 4 scan0103 | |
| Promotional leaflet for the GUC (Patent) Gladwell Updraught Carburettor, featuring a cross-sectional diagram and photograph. | 17th Apr 1936 | Box 122 \ 4 scan0104 | |
| Promotional and descriptive leaflet for the G.U.C. (Gladwell Patent) Updraught Carburettor, including user testimonials and diagrams. | 17th Apr 1936 | Box 122 \ 4 scan0105 | |
| Detailed explanation of the function and benefits of the G. U. C. Patent Sprayer Nozzle in a carburettor. | 17th Apr 1936 | Box 122 \ 4 scan0106 | |
| The features and benefits of the G. U. C. automatic infinitely variable choke carburettor. | 17th Apr 1936 | Box 122 \ 4 scan0107 | |
| The features and performance benefits of the G.U.C. carburettor. | 17th Apr 1936 | Box 122 \ 4 scan0108 | |
| Informational leaflet for the G.U.C. part, detailing prices, guarantees, and a thirty-day trial offer. | 25th Apr 1936 | Box 122 \ 4 scan0109 | |
| Requesting an official order for Amal carburettors to be retained for experimental purposes. | 25th Apr 1936 | Box 122 \ 4 scan0110 | |
| Letter to Messrs. Amal Ltd. inquiring about the availability of a flame trap. | 23th Jun 1936 | Box 122 \ 4 scan0111 | |
| Internal request to place an official order for 'BLUNDELL' exhaust silencer tubing for experimental tests. | 24th Jun 1936 | Box 122 \ 4 scan0112 | |
| Letter from AMAL Ltd. regarding the supply of a Flame Trap with associated blueprints and specifications. | 25th Jun 1936 | Box 122 \ 4 scan0113 | |
| Delivery note from The Speedwell Gear Case Co. Ltd. for perforated tubes and metallic elements. | 27th Jun 1936 | Box 122 \ 4 scan0114 | |
| Letter to Amal Ltd. cancelling a previous letter and order for a flame trap. | 4th Jul 1936 | Box 122 \ 4 scan0115 | |
| Letter from Amal Ltd. confirming the cancellation of an enquiry for a Flame Trap. | 6th Jul 1936 | Box 122 \ 4 scan0116 | |
| Letter discussing a draft report on modifications, a car test with faults, and another motor failure. | 10th Nov 1936 | Box 122 \ 4 scan0117 | |
| Letter from Delco-Remy & Hyatt Ltd. discussing a vehicle demonstration, an intake manifold issue, and the forwarding of A.C. sparking plugs. | 25th May 1936 | Box 122 \ 4 scan0118 | |
| Letter from AMAL Ltd. regarding the dispatch of six Carburetters, one of which has a crack. | 19th Mar 1936 | Box 122 \ 4 scan0119 | |
| Cost file detailing the prices of various carburettors for different car models. | 4th Jan 1938 | Box 122 \ 4 scan0120 | |
| Authorising the fitting of altered idling speed and tilted carburetter modifications to four Phantom Trials cars. | 18th Jan 1938 | Box 122 \ 4 scan0121 | |
| Letter from Zenith Carburetter Co. Ltd regarding the dispatch of idle jets and providing supplier information for a blowing plant and flow meters. | 5th Apr 1938 | Box 122 \ 4 scan0122 | |
| Page 2 of a letter from Zenith Carburetter Co. regarding information on the blowing of carburetters. | 5th Apr 1938 | Box 122 \ 4 scan0123 | |
| Letter to Zenith Carburettor Co. Ltd. requesting detailed drawings of their blowing plant. | 11th Apr 1938 | Box 122 \ 4 scan0124 | |
| Letter to Vauxhall Motors requesting assistance with the design of a flow rig for carburettors. | 3rd May 1938 | Box 122 \ 4 scan0125 | |
| Follow-up letter to Zenith Carburettor Co. Ltd. requesting assistance with designing a flow rig for carburettors. | 3rd May 1938 | Box 122 \ 4 scan0126 | |
| Letter from Zenith Carburetter Co. regarding a flow rig for testing carburetters, enclosing relevant drawings. | 6th May 1938 | Box 122 \ 4 scan0127 | |
| Letter from The Zenith Carburetter Co. regarding a carburettor test setup using an orifice box and associated drawings. | 6th May 1938 | Box 122 \ 4 scan0128 | |
| Covering letter from Zenith Carburetter Co. confirming that supplementary information is being prepared. | 6th May 1938 | Box 122 \ 4 scan0129 | |
| Letter of thanks to Zenith Carburettor Co. Ltd. for information and drawings of a flow rig for testing carburettors. | 9th May 1938 | Box 122 \ 4 scan0130 | |
| Inquiry to Messrs. Trost Bros. Ltd. about the general construction, cost, and manufacturing time for a 'Rotameter' flowmeter. | 12th May 1938 | Box 122 \ 4 scan0131 | |
| Quotation from Trost Brothers Ltd. for two Rotameters for the Experimental Department. | 13th May 1938 | Box 122 \ 4 scan0132 | |
| The second and concluding page of a letter from Trost Brothers, Ltd. | 13th May 1938 | Box 122 \ 4 scan0133 | |
| Brochure for Rota-Throttle-Meters and Rotameters for measuring the flow of gases and liquids. | 13th May 1938 | Box 122 \ 4 scan0134 | |
| Catalogue page detailing various models of Main flow and Orifice-Rotameters with their specifications. | 13th May 1938 | Box 122 \ 4 scan0135 | |
| Catalogue page illustrating various special types of Rotameters and models with magnetic indication and recording. | 13th May 1938 | Box 122 \ 4 scan0136 | |
| Catalogue page detailing different models of all-glass and point-guided float Rotameters for laboratory and industrial use. | 12th May 1938 | Box 122 \ 4 scan0137 | |
| Letter from the Experimental Department inquiring about the details and cost of a blower for a carburettor. | 12th May 1938 | Box 122 \ 4 scan0138 | |
| Letter from Norman Engineering Company regarding a quote for a 'Nash Hytor' Compressor for a carburettor blower application. | 13th May 1938 | Box 122 \ 4 scan0139 | |
| Bulletin No. 270 detailing dimensions and specifications for the Nash Hytor Vacuum Pump and Compressor, Conical Type L. | 13th May 1938 | Box 122 \ 4 scan0140 | |
| Brochure from Nash Engineering Co. detailing the simplicity and performance of Nash Hytor pumps and compressors. | 13th May 1938 | Box 122 \ 4 scan0141 | |
| The features and principle of operation for Cone Type Hytor vacuum pumps and compressors. | 13th May 1938 | Box 122 \ 4 scan0142 | |
| Descriptive leaflet for the Nash Engineering Co. 'Hytor' pump, detailing its construction and advantages. | 18th May 1938 | Box 122 \ 4 scan0143 | |
| Letter from Norman Engineering Company regarding an inquiry for a blower. | 18th May 1938 | Box 122 \ 4 scan0144 | |
| Inquiry to Ferodo Ltd. about supplying a heat and petrol resistant insulating taper packing for a carburettor. | 20th May 1938 | Box 122 \ 4 scan0145 | |
| Letter from Vauxhall Motors Ltd. regarding a mishap with letters about a 'flow-box' and offering to share drawings and data. | 25th May 1938 | Box 122 \ 4 scan0146 | |
| Complaint regarding sticking chokes on 30 HP D.C.42 carburetters and details of the required modifications. | 26th May 1938 | Box 122 \ 4 scan0147 | |
| Letter to The Normal Engineering Company detailing the requirements for a vacuum pump for a carburetter rig. | 8th Jun 1938 | Box 122 \ 4 scan0148 | |
| Proposal from Norman Engineering Company for a 'Nash Hytor' vacuum pump for a carburettor testing plant. | 9th Jun 1938 | Box 122 \ 4 scan0149 | |
| Cover letter from Norman Engineering Company enclosing data for 'Nash Hytor' Conical Vacuum Pumps. | 9th Jun 1938 | Box 122 \ 4 scan0150 | |
| Performance data for Nash Hytor Conical Type Lowvac vacuum pumps. | 15th Mar 1938 | Box 122 \ 4 scan0151 | |
| Dimensional drawing and assembly diagrams for Nash Engineering pumps. | 1st May 1937 | Box 122 \ 4 scan0152 | |
| Letter from the Experimental Department to The Zenith Carburetter Co. Ltd. chasing information on a flow bench for carburetters. | 8th Jun 1938 | Box 122 \ 4 scan0153 | |
| Letter from The Zenith Carburetter Co. Ltd. regarding a new arrangement drawing. | 14th Jun 1938 | Box 122 \ 4 scan0154 | |
| Letter from Zenith Carburetter Co. Ltd. regarding a test plant for carburetters. | 15th Jun 1938 | Box 122 \ 4 scan0155 | |
| Procedure from Zenith Carburetter Co. for setting carburettor throttle conditions. | 15th Jun 1938 | Box 122 \ 4 scan0156 | |
| Letter from Zenith Carburetter Co. detailing the procedure for measuring air flow through a carburetter using orifices and a draught gauge. | 15th Jun 1938 | Box 122 \ 4 scan0157 | |
| Letter from Zenith Carburetter Co. explaining a compressed air petrol supply system and referencing a book on air flow measurement. | 15th Jun 1938 | Box 122 \ 4 scan0158 | |
| Letter of inquiry to Beeker Ltd. regarding the manufacture of custom graduated bottles for fuel flow measurement. | 17th Jun 1938 | Box 122 \ 4 scan0159 | |
| Inquiry to Jas Powell & Sons (Whitefriars) Ltd. about manufacturing graduated bottles for fuel flow measurement. | 17th Jun 1938 | Box 122 \ 4 scan0160 | |
| Letter from W. & J. GEORGE LTD. acknowledging an enquiry and advising on future correspondence. | 20th Jun 1938 | Box 122 \ 4 scan0161 | |
| Letter from James Powell & Sons (Whitefriars) Ltd requesting a sketch to clarify a bottle order. | 20th Jun 1938 | Box 122 \ 4 scan0162 | |
| Letter to the Zenith Carburetter Co. Ltd. regarding missing information on carburetter flooding and air flows. | 22th Jun 1938 | Box 122 \ 4 scan0163 | |
| Letter to Messrs. James Powell & Sons clarifying a previous enquiry for graduated bottles to measure fuel flow. | 22th Jun 1938 | Box 122 \ 4 scan0164 | |
| Letter from a laboratory supplier requesting more details for a quote on fuel flow measurement apparatus. | 25th Jun 1938 | Box 122 \ 4 scan0165 | |
| Letter to Ferodo Ltd. regarding a sample of VM.20 taper packing for carburetter insulation. | 28th Jun 1938 | Box 122 \ 4 scan0166 | |
| Cover letter to Messrs. W. & J. George Ltd. enclosing a rough sketch of apparatus for fuel flow measurement. | 28th Jun 1938 | Box 122 \ 4 scan0167 | |
| Letter from a laboratory supplier acknowledging a request for an apparatus to measure fuel flow. | 29th Jun 1938 | Box 122 \ 4 scan0168 | |
| Price quotation from James Powell & Sons for a graduated bottle. | 29th Jun 1938 | Box 122 \ 4 scan0169 | |
| Need to install a carburetter rig in the Experimental Department to compete with rivals like Vauxhall. | 29th Jun 1938 | Box 122 \ 4 scan0170 | |
| Components and methods for a carburetter flow bench, specifically concerning fuel and air flow measurement. | 30th Jun 1938 | Box 122 \ 4 scan0171 | |
| Carburetter flow bench equipment, discussing orifices, vacuum pumps, and separator tanks, with comparisons to Vauxhall's methods. | 30th Jun 1938 | Box 122 \ 4 scan0172 | |
| The testing methods for Vauxhall 10 HP and 14 HP carburetters, including the use of a flow bench. | 30th Jun 1938 | Box 122 \ 4 scan0173 | |
| Choke flow testing procedures and the justification for using a dedicated flow rig. | 30th Jun 1938 | Box 122 \ 4 scan0174 | |
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