| Description | Date | Identifier | |
| Technical letter discussing fuel gauge variations due to liquid surge and potential pipe obstructions. | 19th Oct 1928 | Box 44 \ 3 Scan037 | |
| Letter from H.M. Hobson, Ltd. regarding the slow reading of a gauge upon filling and plans for bench testing. | 19th Oct 1928 | Box 44 \ 3 Scan038 | |
| Letter from H.M. Hobson Ltd. regarding the calibration of a tank unit and dashboard gauge supplied for chassis GFN-6. | 19th Oct 1928 | Box 44 \ 3 Scan039 | |
| Letter from H.M. Hobson Ltd. regarding the calibration of a tank unit for chassis GFN-6. | 19th Oct 1928 | Box 44 \ 3 Scan040 | |
| Outlining two tests to be performed on a K-S petrol gauge. | 20th Oct 1928 | Box 44 \ 3 Scan041 | |
| Internal request to order one K-S Telegage unit for engine 14G-4. | 22th Oct 1928 | Box 44 \ 3 Scan042 | |
| Letter to Messrs. H.M. Hobson Ltd. regarding the slow action of a gauge and further testing. | 22th Oct 1928 | Box 44 \ 3 Scan043 | |
| Letter to supplier H.M. Hobson Ltd. concerning tank and dashboard units for chassis GFN-6 and an experimental car. | 22th Oct 1928 | Box 44 \ 3 Scan044 | |
| Urgent request to alter the position of a petrol gauge on car 10g-4. | 22th Oct 1928 | Box 44 \ 3 Scan045 | |
| Request to complete an 'SS' tank to allow for petrol gauge calibration and fitting. | 22th Oct 1928 | Box 44 \ 3 Scan046 | |
| Order for two Telegage units from Messrs. H.M. Hobson Ltd. | 24th Oct 1928 | Box 44 \ 3 Scan047 | |
| Letter to Messrs. H.M. Hobson Ltd. confirming an impending official order for two gauges. | 24th Oct 1928 | Box 44 \ 3 Scan048 | |
| Correspondence with H.M. Hobson Ltd. regarding the availability of tanks and the calibration of dashboard units for Mr. Royce. | 25th Oct 1928 | Box 44 \ 3 Scan049 | |
| Letter regarding the return and retention of Telegauges and Tank Units from H.M. Hobson Ltd. | 25th Oct 1928 | Box 44 \ 3 Scan050 | |
| Letter from H.M. Hobson Ltd. regarding the calibration of a tank to drawing F.55744. | 26th Oct 1928 | Box 44 \ 3 Scan051 | |
| Page 2 of a letter from H.M. Hobson Ltd. regarding the calibration and development of fuel gauges. | 26th Oct 1928 | Box 44 \ 3 Scan052 | |
| Authorising payment for a gauge brought by Major Searight. | 26th Oct 1928 | Box 44 \ 3 Scan053 | |
| Request for an India-4 petrol tank to be sent to Claudel Hobsons for petrol gauge calibration. | 26th Oct 1928 | Box 44 \ 3 Scan054 | |
| Letter to H.M. Hobson Ltd. regarding tank calibration, fuel gauge positions for 40/50 HP and 20 HP models, and issues with a balanced gauge. | 27th Oct 1928 | Box 44 \ 3 Scan055 | |
| Letter from H.M. Hobson Ltd. acknowledging a letter and arranging a meeting to discuss calibrating new tank designs. | 30th Oct 1928 | Box 44 \ 3 Scan056 | |
| Letter to H.M. Hobson Ltd. concerning the design of a petrol gauge and tank unit for a 40/50 HP car. | 31th Oct 1928 | Box 44 \ 3 Scan057 | |
| Letter from H.M. Hobson, Ltd. regarding the supply of liquid capsules and air lines for Telegages. | 2nd Nov 1928 | Box 44 \ 3 Scan058 | |
| Page 2 of a letter from H.M. Hobson, Ltd. discussing petrol tank gauge fittings and testing. | 2nd Nov 1928 | Box 44 \ 3 Scan059 | |
| Letter from H.M. Hobson Ltd. detailing test results for a dash head instrument and fuel tank unit. | 5th Nov 1928 | Box 44 \ 3 Scan060 | |
| Page 2 of a test report diagnosing a faulty fuel gauge, concluding the issue is likely an obstruction in the gauge, capillary, or its connections. | 5th Nov 1928 | Box 44 \ 3 Scan061 | |
| Letter from H.M. Hobson, Ltd. regarding a trial for a gauge on a 40/50 HP experimental car. | 5th Nov 1928 | Box 44 \ 3 Scan062 | |
| Letter to H.M. Hobson Ltd. detailing issues with a balanced 40/50 unit's fuel tank, pump, and gauge. | 8th Nov 1928 | Box 44 \ 3 Scan063 | |
| Letter discussing tests with Swan spirit and an invitation to a carburetter meeting. | 9th Nov 1928 | Box 44 \ 3 Scan064 | |
| Letter from H.M. Hobson, Ltd. regarding fuel tank tests and calibration on a 40/50 HP unit. | 9th Nov 1928 | Box 44 \ 3 Scan065 | |
| Technical discussion on the positioning and installation difficulties of a pumping unit within a tank. | 9th Nov 1928 | Box 44 \ 3 Scan066 | |
| Calibration and installation issues of a fuel tank unit. | 9th Nov 1928 | Box 44 \ 3 Scan067 | |
| Letter from H.M. Hobson, Ltd. requesting advice on investigations for a new type tank. | 9th Nov 1928 | Box 44 \ 3 Scan068 | |
| Letter to H.M. Hobson Ltd. regarding the sending, calibration, and ordering of petrol tanks and dashboard units. | 13th Nov 1928 | Box 44 \ 3 Scan069 | |
| Letter from H.M. Hobson Ltd. regarding a telegram exchange about supplying a dashboard gauge for a Phantom eighteen ET. | 16th Nov 1928 | Box 44 \ 3 Scan070 | |
| Letter discussing facia boards, K-S numbers for different horsepower models, and tank calibrations. | 16th Nov 1928 | Box 44 \ 3 Scan071 | |
| Modifications to an experimental tank and a 40/50 HP model tank, including unit positioning and pumping test advice. | 16th Nov 1928 | Box 44 \ 3 Scan072 | |
| Issues with petrol tank gauge calibration, specifically its inability to display the full capacity. | 16th Nov 1928 | Box 44 \ 3 Scan073 | |
| Page 5 of a letter from H.M. Hobson, Ltd. discussing gallons and time constraints. | 16th Nov 1928 | Box 44 \ 3 Scan074 | |
| The dispatch of India IV and 'SS' petrol tanks to Messrs. Hobson for the fitting of petrol gauges. | 19th Nov 1928 | Box 44 \ 3 Scan075 | |
| Letter to Messrs. H.M. Hobson regarding issues with petrol tanks and gauges. | 20th Nov 1928 | Box 44 \ 3 Scan076 | |
| Letter discussing the experimental setup of a tank unit and arrangements for further testing. | 23th Nov 1928 | Box 44 \ 3 Scan077 | |
| Letter from H.M. Hobson, Ltd. regarding a design alteration to the N.soh.2571 tank to improve pumping rate. | 23th Nov 1928 | Box 44 \ 3 Scan078 | |
| Experiments and tests conducted on 20 HP and 40/50 HP fuel tanks, including modifications and performance. | 23th Nov 1928 | Box 44 \ 3 Scan079 | |
| Letter from H.M. Hobson, Ltd. regarding the completion of a pumping test on a tank. | 23th Nov 1928 | Box 44 \ 3 Scan080 | |
| Test results for a petrol tank on a luggage carrier, recording mileage and fuel gauge readings under dry and wet road conditions. | 21th Nov 1928 | Box 44 \ 3 Scan081 | |
| Log of fuel gauge readings against mileage and fuel in tank during a road test from Acton to Bournemouth. | 23th Nov 1928 | Box 44 \ 3 Scan082 | |
| Test report detailing fuel tank levels, mileage, and gauge readings for a cranked unit. | 24th Nov 1928 | Box 44 \ 3 Scan083 | |
| Road test log detailing fuel tank levels, mileage, and gauge readings for a Straight Unit. | 24th Nov 1928 | Box 44 \ 3 Scan084 | |
| Fuel consumption test log showing fuel levels against mileage for a Straight Unit. | 30th Nov 1928 | Box 44 \ 3 Scan085 | |
| Fuel consumption test report detailing mileage against fuel tank levels. | 30th Nov 1928 | Box 44 \ 3 Scan086 | |
| Test results for top cup pumping with two vertical bell units in different positions. | 11th Dec 1928 | Box 44 \ 3 Scan087 | |
| Test report on top cup pumping, detailing calibrations and performance during various driving conditions. | 8th Dec 1928 | Box 44 \ 3 Scan088 | |
| Request to order six K-S petrol gauges from H.M. Hobson for six SS chassis. | 23th Nov 1928 | Box 44 \ 3 Scan089 | |
| Letter to H.M. Hobson Ltd. regarding a report on the behaviour of a 20 HP gauge and pumping issues. | 30th Nov 1928 | Box 44 \ 3 Scan090 | |
| Calibration and road test report for a Hobson K-S telegage on a 20 HP chassis. | 30th Nov 1928 | Box 44 \ 3 Scan091 | |
| Second test of a petrol gauge, detailing fuel level changes over distance. | 3rd Dec 1928 | Box 44 \ 3 Scan092 | |
| Letter from H.M. Hobson, Ltd. regarding the testing and return of a 20 HP tank (Scheme 2578). | 3rd Dec 1928 | Box 44 \ 3 Scan093 | |
| Letter from H.M. Hobson Ltd. detailing the results of tests on a fuel tank and pumping unit. | 3rd Dec 1928 | Box 44 \ 3 Scan094 | |
| Invoice from H.M. Hobson Ltd for fitting petrol telegauges and confirming delivery of a dash unit. | 4th Dec 1928 | Box 44 \ 3 Scan095 | |
| Instructing stores to despatch a dashboard petrol gauge to Hoopers Coachbuilders for urgent fitting. | 4th Dec 1928 | Box 44 \ 3 Scan096 | |
| Letter from H.M. Hobson, Ltd. regarding the calibration of a petrol telegage for a 20 HP gauge. | 5th Dec 1928 | Box 44 \ 3 Scan097 | |
| Swan spirit and road tests, discussing fuel loss and component modifications. | 5th Dec 1928 | Box 44 \ 3 Scan098 | |
| Fuel pumping system test, detailing petrol levels, cup positions, and gauge readings. | 5th Dec 1928 | Box 44 \ 3 Scan099 | |
| Letter from H.M. Hobson, Ltd. discussing pumping tests and installation flange angle discrepancies. | 5th Dec 1928 | Box 44 \ 3 Scan100 | |
| Urgent internal memo requesting the order of a K-S petrol gauge from Claudel Hobson. | 5th Dec 1928 | Box 44 \ 3 Scan101 | |
| Post office telegram requesting an extension for experiments on a 40/50 model tank. | 6th Dec 1958 | Box 44 \ 3 Scan102 | |
| The supply and payment for a K-S Petrol Gauge. | 7th Dec 1928 | Box 44 \ 3 Scan103 | |
| Difficulty with the K.S. petrol gauge flange angle and its impact on calibration. | 10th Dec 1928 | Box 44 \ 3 Scan104 | |
| Letter from coachbuilder Hooper & Co. regarding parts for Body No. 7122 on an Experimental 40/50HP car. | 10th Dec 1928 | Box 44 \ 3 Scan105 | |
| Recommended installation procedure for K.S. petrol gauges. | 10th Dec 1928 | Box 44 \ 3 Scan106 | |
| Difficulties and proposed modifications for mounting a Hooper Sedanca body onto a 19-EX chassis. | 11th Dec 1928 | Box 44 \ 3 Scan107 | |
| Incorrectly fitted Hobson petrol gauge found in the Test department and a request to monitor future installations. | 12th Dec 1928 | Box 44 \ 3 Scan108 | |
| Instructions for fitting K-S petrol gauges to avoid unsatisfactory behaviour. | 1st Sep 1928 | Box 44 \ 3 Scan109 | |
| Requesting a requisition to cover an order for K-S Petrol Gauges. | 1st Dec 1928 | Box 44 \ 3 Scan110 | |
| Request to Messrs. Hobson for a drawing of an India 1V Petrol Tank to correct the angle of the airline connections. | 13th Dec 1928 | Box 44 \ 3 Scan111 | |
| Order for a K.S. Petrol Gauge and authorising payment for tank carriage. | 13th Dec 1928 | Box 44 \ 3 Scan112 | |
| Letter to H.M. Hobson Ltd. regarding an incorrectly drilled tank, part KS.175, for a 20 HP Telegage system. | 13th Dec 1928 | Box 44 \ 3 Scan113 | |
| Letter from H.M. Hobson, Ltd. concerning pumping tests on Tank F.79192. | 14th Dec 1928 | Box 44 \ 3 Scan114 | |
| Fuel consumption and tank installation testing for the 40/50 HP model, including overnight fuel loss. | 14th Dec 1928 | Box 44 \ 3 Scan115 | |
| Letter from H.M. Hobson Ltd. proposing an installation on the writer's car, referencing a King-Seeley aircraft gauge system. | 14th Dec 1928 | Box 44 \ 3 Scan116 | |
| Letter from H.M. Hobson, Ltd. concerning the '20 HP Telegage' and part K.S.175. | 15th Dec 1928 | Box 44 \ 3 Scan117 | |
| Letter discussing the despatch and fitting of gauge units and related drawings for various models. | 15th Dec 1928 | Box 44 \ 3 Scan118 | |
| Letter from H.M. Hobson, Ltd. discussing unit fitting modifications and manufacturing variations. | 15th Dec 1928 | Box 44 \ 3 Scan119 | |
| Letter from H.M. Hobson Ltd. regarding preliminary tests on a 40/50 HP tank and seeking clarification on production specifications. | 8th Dec 1928 | Box 44 \ 3 Scan120 | |
| Letter from H.M. Hobson Ltd. regarding the effect of flange angle variations on fuel calibrations and ongoing pumping tests. | 8th Dec 1928 | Box 44 \ 3 Scan121 | |
| Letter from H.M. Hobson Ltd. regarding a visit to discuss an experimental tank and gauge gear testing. | 8th Dec 1928 | Box 44 \ 3 Scan122 | |
| Letter from H.M. Hobson, Ltd. discussing a procedure for gauges getting wet lines at the coachbuilders. | 8th Dec 1928 | Box 44 \ 3 Scan123 | |
| Test results for top cup pumping on a fuel tank. | 5th Dec 1928 | Box 44 \ 3 Scan124 | |
| Test report on top cup pumping, detailing fuel gauge readings against mileage and tank levels. | 10th Dec 1928 | Box 44 \ 3 Scan125 | |
| Road test report for a petrol tank fitted to a 20 HP car, detailing routes, road conditions, and temperatures. | 19th Nov 1928 | Box 44 \ 3 Scan126 | |
| Log of petrol tank level measurements and gauge readings against mileage and time. | 17th Nov 1928 | Box 44 \ 3 Scan127 | |
| Log of fuel gauge readings at different mileage intervals after removing specific amounts of fuel. | 19th Nov 1928 | Box 44 \ 3 Scan128 | |
| Clarifying the status of gauges required for experimental cars and correcting a previously delivered incorrect gauge. | 17th Dec 1928 | Box 44 \ 3 Scan129 | |
| Electrical tinning process for K.S. petrol gauge tank units. | 17th Dec 1928 | Box 44 \ 3 Scan130 | |
| Inquiry to H.M. Hobson Ltd. regarding their experience with corrosion on un-tinned tank units. | 17th Dec 1928 | Box 44 \ 3 Scan131 | |
| The need for a dashboard reading fuel gauge due to integrated trunks making the standard gauge unreadable. | 18th Dec 1928 | Box 44 \ 3 Scan132 | |
| Letter from H. M. Hobson, Ltd. regarding the tinning versus nickel plating process for tank units. | 18th Dec 1928 | Box 44 \ 3 Scan133 | |
| Letter from H.M. Hobson Ltd. regarding nickel plating processes and potential impurities in petrol tanks. | 18th Dec 1928 | Box 44 \ 3 Scan134 | |
| Letter to H.M. Hobson Ltd. regarding the trial of a hand pump on a petrol gauge. | 19th Dec 1928 | Box 44 \ 3 Scan135 | |
| Letter from H.M. Hobson, Ltd. confirming the suitability of a 100% gauge and arranging for K.S.180 and K.S.175 sets to be prepared for testing. | 21th Dec 1928 | Box 44 \ 3 Scan136 | |
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