| Description | Date | Identifier | |
| Letter discussing issues with glass tube holders in sand-cast bodies and proposed modifications to prevent strain and breakage. | 23th Apr 1929 | Box 44 \ 4 Scan044 | |
| Page 3 of a letter from H.M. Hobson, Ltd. discussing a potential instrument installation issue. | 23th Apr 1929 | Box 44 \ 4 Scan045 | |
| Invoice from H. M. Hobson, Ltd. and the need to issue a covering order for payment. | 24th Apr 1929 | Box 44 \ 4 Scan046 | |
| Letter to H.M. Hobson Ltd. regarding the specifications for a K.S. gauge destined for India. | 24th Apr 1929 | Box 44 \ 4 Scan047 | |
| A gauge required for chassis 17-EX for the Maharajah of Kashmir. | 25th Apr 1929 | Box 44 \ 4 Scan048 | |
| Instructing the stores to despatch a dashboard petrol gauge fitting to Messrs. H.M. Hobson for examination. | 25th Apr 1929 | Box 44 \ 4 Scan049 | |
| Letter from H.M. Hobson Ltd. regarding the supply and specification of K-S Telegages. | 25th Apr 1929 | Box 44 \ 4 Scan050 | |
| Letter from H.M. Hobson Ltd., regarding orders with a dual air line. | 25th Apr 1929 | Box 44 \ 4 Scan051 | |
| Letter to H.M. Hobson Ltd. regarding a gauge that failed during recent tests in France. | 25th Apr 1929 | Box 44 \ 4 Scan052 | |
| Letter to Dunlop Rubber Co. Ltd. requesting 8 sample tyres for testing, focusing on rolling circumference and steering effect. | 25th Apr 1929 | Box 44 \ 4 Scan053 | |
| Letter from H.M. Hobson Ltd. clarifying an order for Telegages, regarding a discrepancy between using triple or double air lines. | 26th Apr 1929 | Box 44 \ 4 Scan054 | |
| Letter from H.M. Hobson Ltd. regarding the examination of a faulty gauge with a broken glass tube. | 27th Apr 1929 | Box 44 \ 4 Scan055 | |
| Issues with Hobson Telegages and a recommendation for replacement with a triple air line unit. | 27th Apr 1929 | Box 44 \ 4 Scan056 | |
| Change from double to triple air line petrol gauges due to issues in hot climates. | 29th Apr 1929 | Box 44 \ 4 Scan057 | |
| Letter to H.M. Hobson Ltd. regarding variations in the speed of hand air pump units for K-S gauges. | 29th Apr 1929 | Box 44 \ 4 Scan058 | |
| Experiments and comparisons between the K.S., Nivex, and Hobson petrol gauges. | 29th Apr 1929 | Box 44 \ 4 Scan059 | |
| Confirming the correct testing of a petrol gauge for chassis 17-EX. | 30th Apr 1929 | Box 44 \ 4 Scan060 | |
| The dispatch of a replacement telegage for chassis 17-EX and an additional dashboard unit. | 5th May 1929 | Box 44 \ 4 Scan061 | |
| Letter from H.M. Hobson Ltd. discussing a faulty gauge returned from a French car. | 1st May 1929 | Box 44 \ 4 Scan062 | |
| Communication about required clearances for glass tube holders and rubber support rings within a body casting to prevent strain. | 1st May 1929 | Box 44 \ 4 Scan063 | |
| Letter from H.M. Hobson, Ltd. promising further correspondence regarding the speed of correction when pumping. | 1st May 1929 | Box 44 \ 4 Scan064 | |
| Letter to H.M. Hobson Ltd. about the unsatisfactory performance of a gauge in a 40/50 HP car, requesting a replacement tank unit. | 1st May 1929 | Box 44 \ 4 Scan065 | |
| Letter from H.M. Hobson Ltd. regarding the replacement of a K.S.100 installation with a pump type gauge. | 2nd May 1929 | Box 44 \ 4 Scan066 | |
| Letter discussing the supply and compatibility of a tank unit top, referencing specific part numbers and installation precautions. | 2nd May 1929 | Box 44 \ 4 Scan067 | |
| Page 3 of a letter from H.M. Hobson, Ltd. regarding a gauge complaint, attributing the issue to over-night loss and promising new installation diagrams. | 2nd May 1929 | Box 44 \ 4 Scan068 | |
| Letter from H.M. Hobson, Ltd. regarding the replacement of a K.S.100 installation with a K.S.100 A.P. installation, enclosing a blueprint. | 3rd May 1929 | Box 44 \ 4 Scan069 | |
| Letter from H.M. Hobson, Ltd. concerning variations in the speed of an air pump. | 3rd May 1929 | Box 44 \ 4 Scan070 | |
| Technical letter about rectifying a fuel gauge issue by modifying the petrol exit hole on a bell plate. | 3rd May 1929 | Box 44 \ 4 Scan071 | |
| Technical analysis of a pump and gauge mechanism, focusing on the function of the bell plate under shock conditions. | 3rd May 1929 | Box 44 \ 4 Scan072 | |
| Page 4 of a letter from H.M. Hobson, Ltd. concerning modifications to a petrol pump unit. | 3rd May 1929 | Box 44 \ 4 Scan073 | |
| Incorrect K.S. Petrol Gauge received for chassis 17-EX, requesting a new order for the correct part and managing the return of the redundant unit. | 5th May 1929 | Box 44 \ 4 Scan074 | |
| Letter to H.M. Hobson Ltd. regarding issues with an instrument installation, enamelling quality, and clarifying a component order. | 3rd May 1929 | Box 44 \ 4 Scan075 | |
| Letter apologising for the failure to cross-reference official orders with prior correspondence from the Experimental Department. | 6th May 1929 | Box 44 \ 4 Scan076 | |
| Updated procedure for connecting the K.S. petrol gauge using a hand pump. | 6th May 1929 | Box 44 \ 4 Scan077 | |
| Letter from H.M. Hobson, Ltd. confirming receipt of an order for a K-S.100 A.P. tank unit. | 6th May 1929 | Box 44 \ 4 Scan078 | |
| Letter discussing the manufacturing process and black finish for instrument frames, comparing sand castings to die-cast frames. | 6th May 1929 | Box 44 \ 4 Scan079 | |
| Page 3 of a letter from H.M. Hobson, Ltd. discussing production arrangements and duplication. | 6th May 1929 | Box 44 \ 4 Scan080 | |
| Letter to H.M. Hobson Ltd. discussing the performance and potential modifications of a fuel gauge system after testing in France. | 6th May 1929 | Box 44 \ 4 Scan081 | |
| Replacement of obsolete tank units and air lines with new parts. | 7th May 1929 | Box 44 \ 4 Scan082 | |
| Instruction to send obsolete petrol gauge parts to Messrs. Hobson for despatch. | 7th May 1929 | Box 44 \ 4 Scan083 | |
| Request to make three sets of aluminium back plates with lugs for adapting instruments to a new board. | 8th May 1929 | Box 44 \ 4 Scan084 | |
| Letter from H.M. Hobson Ltd. regarding fuel vaporization and overnight loss issues with the K.S.180 installation in France. | 8th May 1929 | Box 44 \ 4 Scan085 | |
| Letter from H.M. Hobson Ltd. discussing excessive vaporization, gauges, and enclosing a replacement drawing. | 8th May 1929 | Box 44 \ 4 Scan086 | |
| Standardisation of chassis parts for the Hobson K&S distance petrol gauge. | 7th Jun 1928 | Box 44 \ 4 Scan087 | |
| Standardisation document for a Phantom Junior chassis front cross-tube. | 21th Feb 1929 | Box 44 \ 4 Scan088 | |
| Standardisation of the Hobson K-S Distance Reading Petrol Gauge as fitted on F.78040. | 7th Jun 1928 | Box 44 \ 4 Scan089 | |
| Standardisation form for a new chassis part, detailing its introduction series, test date, and tooling costs. | 28th Jan 1929 | Box 44 \ 4 Scan090 | |
| Query regarding errors on standardisation sheets for the Hobson Gauge on 40/50 HP and 20 HP models. | 10th May 1929 | Box 44 \ 4 Scan091 | |
| The postponement and revised implementation plan for standard K.S. petrol gauges on the 40/50 HP and 20 HP models. | 11th May 1929 | Box 44 \ 4 Scan092 | |
| Follow-up memo regarding an overdue K.S. Telegage tank unit for the 17-EX car. | 14th May 1929 | Box 44 \ 4 Scan093 | |
| Short letter to Messrs. H.M. Hobson Ltd. confirming a meeting for the attention of Major Searight. | 14th May 1929 | Box 44 \ 4 Scan094 | |
| Proposing to instruct for a change to lever and cam specifications for the J.2 series chassis from the 51st unit onwards. | 16th May 1929 | Box 44 \ 4 Scan095 | |
| Letter from H.M. Hobson, Ltd. to W.A. Robotham confirming an afternoon meeting. | 30th Apr 1930 | Box 44 \ 4 Scan096 | |
| Letter from H.M. Hobson, Ltd. regarding faulty Telegage heads. | 27th Aug 1929 | Box 44 \ 4 Scan097 | |
| Page 2 of a letter from H. M. Hobson, Ltd. regarding clearance for a glass tube and capillaries. | 27th Aug 1929 | Box 44 \ 4 Scan098 | |
| Invoice from H.M. Hobson Ltd. for parts dispatched to Sevres. | 1st Aug 1929 | Box 44 \ 4 Scan099 | |
| Requesting an update on Telegage parts sent to France, in order to clear an outstanding invoice from H.M. Hobson Ltd. | 4th Oct 1929 | Box 44 \ 4 Scan100 | |
| Outstanding invoice from H.M. Hobson Ltd. for Telegage parts sent to France. | 5th Nov 1929 | Box 44 \ 4 Scan101 | |
| Letter from H. M. Hobson, Ltd. about the procedure for handling gauges on chassis delivered to coachbuilders. | 18th Jul 1929 | Box 44 \ 4 Scan102 | |
| Letter regarding the installation procedure for Hobson K-S Telegage sets on a chassis. | 18th Jul 1929 | Box 44 \ 4 Scan103 | |
| Letter to H.M. Hobson Ltd. regarding the advantages of the Nivex petrol gauge over the K.S. gauge. | 12th Mar 1930 | Box 44 \ 4 Scan104 | |
| Correction sheet with installation checks and tests for a faulty Hobson K-S Telegage. | 1st Feb 1930 | Box 44 \ 4 Scan105 | |
| Diagram sheet explaining the components and operation of the Hobson K-S Telegage fuel gauge. | 1st Feb 1930 | Box 44 \ 4 Scan106 | |
| Operation sheet for the Hobson K-S Telegage fuel gauge system. | 1st Feb 1930 | Box 44 \ 4 Scan107 | |
| Correction sheet for the Hobson K-S Telegage system. | 1st Feb 1930 | Box 44 \ 4 Scan108 | |
| Diagram sheet for the Hobson K-S Telegage fuel gauge, showing its components and operation. | 1st Feb 1930 | Box 44 \ 4 Scan109 | |
| Operation sheet for the Hobson K-S Telegage fuel gauge system. | 13th Mar 1930 | Box 44 \ 4 Scan110 | |
| Letter from H.M. Hobson, Ltd. concerning the operation of Nivex petrol gauges. | 13th Mar 1930 | Box 44 \ 4 Scan111 | |
| The design and issues of gauges, and planned communication with the King-Seeley Corporation. | 13th Mar 1930 | Box 44 \ 4 Scan112 | |
| Letter from H.M. Hobson, Ltd. requesting information regarding the air replacement method for a gauge tank unit. | 13th Mar 1930 | Box 44 \ 4 Scan113 | |
| Letter from H.M. Hobson, Ltd. regarding the design and production of gauges. | 14th Mar 1930 | Box 44 \ 4 Scan114 | |
| Letter discussing the market position and customer preference for red liquid column type petrol gauges. | 14th Mar 1930 | Box 44 \ 4 Scan115 | |
| Letter arguing for a distinct, red liquid column type petrol gauge over a standard needle dial. | 14th Mar 1930 | Box 44 \ 4 Scan116 | |
| Letter from H.M. Hobson, Ltd. discussing their investigation into suitable Bourdon tube and diaphragm type pressure gauges. | 29th Mar 1930 | Box 44 \ 4 Scan117 | |
| Page 2 of a letter from H.M. Hobson Ltd. regarding awaiting results from the King Seeley Corporation. | 29th Mar 1930 | Box 44 \ 4 Scan118 | |
| Letter from H.M. Hobson, Ltd. to the Experimental Department to arrange a meeting. | 29th Apr 1930 | Box 44 \ 4 Scan119 | |
| Letter from H.M. Hobson Ltd. discussing a suggestion for supporting an armoured casing and a triple air line. | 19th Jul 1929 | Box 44 \ 4 Scan120 | |
| Letter from H.M. Hobson, Ltd. regarding the shipment of a K.S.180.P tank unit and a second 'red unit' to France. | 19th Jul 1929 | Box 44 \ 4 Scan121 | |
| Modifications to a tank unit and air line to resolve an issue with petrol leakage. | 19th Jul 1929 | Box 44 \ 4 Scan122 | |
| Letter from T.P. Searight to W.A. Robotham discussing a car part and instructions for testing. | 19th Jul 1929 | Box 44 \ 4 Scan123 | |
| Instructions for testing a pressure balance air line by fitting a standard and then a red topped unit. | 20th Jul 1929 | Box 44 \ 4 Scan124 | |
| Letter from H.M. Hobson Ltd. regarding a solution for a broken air/pressure balance line. | 25th Jul 1929 | Box 44 \ 4 Scan125 | |
| Letter from H.M. Hobson Ltd. discussing a 'mock-up' suggestion for an armoured hose installation. | 25th Jul 1929 | Box 44 \ 4 Scan126 | |
| Letter from H.M. Hobson Ltd. regarding a leaking dash instrument and the procurement of better rubber rings. | 15th Aug 1929 | Box 44 \ 4 Scan127 | |
| Page 2 of a letter from H.M. Hobson, Ltd. | 15th Aug 1929 | Box 44 \ 4 Scan128 | |
| Correspondence from H.M. Hobson Ltd. regarding a failed dash unit and its replacement. | 16th Aug 1929 | Box 44 \ 4 Scan129 | |
| Procedure for handling and rectifying issues with K.S. Pressure Gauges. | 6th Dec 1929 | Box 44 \ 4 Scan130 | |
| The return of two Hobson K.S. tank units and two hand pumps to Stores. | 10th Dec 1929 | Box 44 \ 4 Scan131 | |
| Letter to H.M. Hobson Ltd. regarding feedback on gauges, including testing, fitting, and material composition. | 10th Dec 1929 | Box 44 \ 4 Scan132 | |
| Letter from H.M. Hobson, Ltd. regarding the testing and modification of a component model. | 11th Dec 1929 | Box 44 \ 4 Scan133 | |
| The material and construction of a gauge, considering the use of gun-metal versus aluminium and its interaction with Acetylene Tetrabromide. | 11th Dec 1929 | Box 44 \ 4 Scan134 | |
| Letter from H.M. Hobson, Ltd. regarding the practice of replacing a body. | 11th Dec 1929 | Box 44 \ 4 Scan135 | |
| Letter to H.M. Hobson Ltd. regarding a gauge head model, spring attachments, and material considerations. | 12th Dec 1929 | Box 44 \ 4 Scan136 | |
| Letter from H.M. Hobson Ltd. regarding the retention of a gauge head for testing and the preparation of a new casting. | 16th Dec 1929 | Box 44 \ 4 Scan137 | |
| Letter from H.M. Hobson, Ltd. regarding the dispatch of a sample body casting for gauges. | 27th Dec 1929 | Box 44 \ 4 Scan138 | |
| Letter to H.M. Hobson Ltd. regarding a modification for fixing a K.S. telegauge head and a proposal for a new gauge. | 2nd Jan 1930 | Box 44 \ 4 Scan139 | |
| Recommendation to fit the Hobson Telegauge with a bevelled glass to match other instruments. | 30th Nov 1929 | Box 44 \ 4 Scan140 | |
| Letter from H. M. Hobson, Ltd. regarding the fixing of a Telegage head and incorporating a fused glass tube seal for a 10,000-mile car test. | 6th Jan 1930 | Box 44 \ 4 Scan141 | |
| Changing gauge manufacturing from a Bakelite cemented joint to a fused glass seal to improve reliability. | 6th Jan 1930 | Box 44 \ 4 Scan142 | |
| Letter from H.M. Hobson Ltd. regarding the supply and modification of gauges. | 6th Jan 1930 | Box 44 \ 4 Scan143 | |
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