| Description | Date | Identifier | |
| Letter to H.M. Hobson Ltd. regarding the calibration of a tank and a discrepancy found due to a sump alteration. | 16th Feb 1927 | Box 44 \ 2 Scan047 | |
| Calibration chart for a Goshawk engine petrol tank. | 18th Feb 1937 | Box 44 \ 2 Scan048 | |
| Letter regarding the calibration of a gauge face for a 40/50 HP engine and the return of four carburetters. | 21th Feb 1927 | Box 44 \ 2 Scan049 | |
| Letter from H.M. Hobson Ltd. regarding the Hobson K-S Petrol Telegage for a 20 HP car, enclosing a sketch and advising on the delivery of other parts. | 21th Feb 1927 | Box 44 \ 2 Scan050 | |
| Letter regarding an order for an improved King-Seeley instrument board fuel gauge. | 23th Feb 1927 | Box 44 \ 2 Scan051 | |
| Letter from H.M. Hobson Ltd. regarding an incorrectly calibrated Telegage unit mask for a 40/50 HP car. | 22th Feb 1927 | Box 44 \ 2 Scan052 | |
| Order request for a King Seeley petrol gauge for a 20 HP car, with a subsequent note that the instrument has been received. | 1st Feb 1927 | Box 44 \ 2 Scan053 | |
| Calibration chart for a Hobson K.S. Telegauge showing actual liquid level versus scale markings in gallons. | 9th Mar 1927 | Box 44 \ 2 Scan054 | |
| Letter to H.M. Hobson Ltd. regarding the calibration of a K-S Telegauge for a 20 HP car, with a request for future modifications. | 9th Mar 1927 | Box 44 \ 2 Scan055 | |
| Letter from H.M. Hobson Ltd. regarding petrol tank calibration for the Phantom Car and alteration of A.V.T.64 carburetters. | 9th Mar 1927 | Box 44 \ 2 Scan056 | |
| Page two of a letter from H. M. Hobson, Ltd. concerning the return of smaller chokes and the completion of tests. | 9th Mar 1927 | Box 44 \ 2 Scan057 | |
| Letter from H.M. Hobson Ltd. regarding the calibration of the Hobson K-S Petrol Telegage and enclosing blueprints. | 10th Mar 1927 | Box 44 \ 2 Scan058 | |
| Fitting of a Claudel telegage unit to 40/50 HP and 20 HP tanks. | 11th Mar 1927 | Box 44 \ 2 Scan059 | |
| Letter from H.M. Hobson Ltd. confirming the preparation of a Telegage tank unit for a 40/50 HP car. | 12th Mar 1927 | Box 44 \ 2 Scan060 | |
| Letter to Messrs. Claudel Hobson Ltd. requesting a 40/50 HP tank unit be sent to designers for inspection. | 11th Mar 1927 | Box 44 \ 2 Scan061 | |
| Letter from the American branch to the English branch discussing the ordering and testing of King-Seeley and Nivex fuel gauges. | 28th Mar 1927 | Box 44 \ 2 Scan062 | |
| Hand-drawn diagram illustrating the working principle of a 'hiveso' fuel gauge system. | 28th Mar 1927 | Box 44 \ 2 Scan063 | |
| Letter from H.M. Hobson, Ltd. arranging a visit to calibrate a 40/50 tank for a Hobson K-S telegage. | 20th Apr 1927 | Box 44 \ 2 Scan064 | |
| Letter to Claudel Hobson Ltd. chasing an ordered petrol gauge for a 40/50 HP car. | 25th Apr 1927 | Box 44 \ 2 Scan065 | |
| Letter to H.M. Hobson Ltd. concerning the calibration and dispatch of a tank unit. | 29th Apr 1927 | Box 44 \ 2 Scan066 | |
| Letter from H.M. Hobson, Ltd. regarding a Hobson K-S Telegage unit for a 40/50 HP car. | 26th Apr 1927 | Box 44 \ 2 Scan067 | |
| Letter from H.M. Hobson Ltd. concerning the calibration of an oval tank and the requirement for a tank drawing. | 28th Apr 1927 | Box 44 \ 2 Scan068 | |
| Letter from H.M. Hobson, Ltd. regarding the supply of a Hobson K-S Petrol Telegage and a mix-up with a dashboard unit. | 2nd May 1927 | Box 44 \ 2 Scan069 | |
| Page 2 of a letter from H. M. Hobson, Ltd. regarding the angle of a facia board and requesting an order. | 2nd May 1927 | Box 44 \ 2 Scan070 | |
| Letter to H.M. Hobson Ltd. confirming an official order for 2 K-S Telegauges will be forwarded. | 3rd May 1927 | Box 44 \ 2 Scan071 | |
| Internal request to order two complete K-S petrol gauges for a 40/50 HP car. | 3rd May 1927 | Box 44 \ 2 Scan072 | |
| The K-S Telegauge, confirming a unit is the correct type and requesting one more dashboard unit. | 5th May 1927 | Box 44 \ 2 Scan073 | |
| Inquiry about the 10,000-mile test of the Claudel Hobson Petrol Indicator. | 15th Jun 1927 | Box 44 \ 2 Scan074 | |
| Inquiry about the present position of the Claudel-Hobson Petrol Gauge and its potential introduction as a standard part. | 29th Jun 1927 | Box 44 \ 2 Scan075 | |
| Internal request to order K-S Telegage liquid capsules from Messrs. Hobson. | 1st Jul 1927 | Box 44 \ 2 Scan076 | |
| Unreliability of the Hobson type petrol gauge on experimental cars. | 11th Jul 1927 | Box 44 \ 2 Scan077 | |
| Readability of the standard gauge versus the telegauge on the chassis. | 13th Jul 1927 | Box 44 \ 2 Scan078 | |
| Dissatisfaction and ongoing testing of the Claudel Hobson Petrol Gauge. | 15th Jul 1927 | Box 44 \ 2 Scan079 | |
| Letter to H.M. Hobson Ltd. regarding inconsistent readings and apparent overnight fuel loss on their petrol gauges. | 12th Jul 1927 | Box 44 \ 2 Scan080 | |
| Letter from H.M. Hobson Ltd. regarding an overnight loss in the reading of Hobson K-S Telegages. | 13th Jul 1927 | Box 44 \ 2 Scan081 | |
| Typed letter discussing overnight fuel loss and potential faults in the tank unit or gauge. | 13th Jul 1927 | Box 44 \ 2 Scan082 | |
| Letter from H.M. Hobson, Ltd. regarding cracks found in tubing for tank units and a request for assistance in tracing the fault. | 13th Jul 1927 | Box 44 \ 2 Scan083 | |
| Letter to Claudel Hobson Ltd. asking if the vent pipe on the telegauge for petrol tanks can be dispensed with. | 7th Nov 1927 | Box 44 \ 2 Scan084 | |
| Letter from H.M. Hobson, Ltd. explaining the function of a safety vent pipe on their K-S Telegages. | 8th Nov 1927 | Box 44 \ 2 Scan085 | |
| Petrol tank vent tube design and potential issues during refueling. | 8th Nov 1927 | Box 44 \ 2 Scan086 | |
| Letter from H.M. Hobson, Ltd. regarding a fuel tank fitting and gauge operation procedure. | 8th Nov 1927 | Box 44 \ 2 Scan087 | |
| Questioning the need for a vent pipe on a Hobson's K.S. petrol gauge. | 27th Oct 1927 | Box 44 \ 2 Scan088 | |
| Modifications to the petrol tank, shock damper, and exhaust pipe. | 29th Oct 1927 | Box 44 \ 2 Scan089 | |
| Effectiveness of the telegauge vent pipe and related experimental tests. | 10th Nov 1927 | Box 44 \ 2 Scan090 | |
| Letter to H.M. Hobson Ltd. discussing the design and safety features of a vent pipe for petrol tanks. | 10th Nov 1927 | Box 44 \ 2 Scan091 | |
| Letter discussing a tank unit fitting, vent pipe, and the procedure for operating a gauge. | 6th Jan 1928 | Box 44 \ 2 Scan092 | |
| Letter from H.M. Hobson Ltd. concerning a print for a Sprengel unit tank. | 6th Jan 1928 | Box 44 \ 2 Scan093 | |
| Listing topics for 20 HP dynamometer and road tests concerning steering and axle components. | 17th Jan 1928 | Box 44 \ 2 Scan094 | |
| Instructing Stores to despatch a tank unit to H.M. Hobson Ltd for an exchange. | 17th Jan 1928 | Box 44 \ 2 Scan095 | |
| Letter to H.M. Hobson Ltd. requesting modifications for a new type of tank unit and an associated estimate. | 17th Jan 1928 | Box 44 \ 2 Scan096 | |
| Letter to H.M. Hobson Ltd. regarding the exchange and urgent request for tank units. | 17th Jan 1928 | Box 44 \ 2 Scan097 | |
| Urgent internal request for K-S telegage masks and air lines from Messrs. Claudel Hobson Ltd. | 2nd Feb 1928 | Box 44 \ 2 Scan098 | |
| The K.S. Telegauge, petrol tank, and instrument board for a Sports (Continental) Chassis. | 2nd Feb 1928 | Box 44 \ 2 Scan099 | |
| Letter to Messrs. Barkers confirming the dispatch of a temporary Telegage instrument for fitting on experimental car 16-EX. | 10th Feb 1928 | Box 44 \ 2 Scan100 | |
| Letter from coachbuilder Barker & Co. regarding a Telegauge for an Experimental Sports vehicle. | 13th Feb 1928 | Box 44 \ 2 Scan101 | |
| Letter to Claudel Hobson Ltd. regarding a graph of liquid petrol levels in a tank without a sump, with an attached blueprint. | 15th Feb 1928 | Box 44 \ 2 Scan102 | |
| Corrected mask scale diagram for No Sump Tanks 40/50, comparing telegauge readings to actual liquid levels. | 15th Feb 1928 | Box 44 \ 2 Scan103 | |
| Blank page with a receiving stamp from the 'INT ROOM' in Derby. | 15th Feb 1928 | Box 44 \ 2 Scan104 | |
| Specifying the graduation for distance petrol gauges being ordered for a sports car. | 15th Feb 1928 | Box 44 \ 2 Scan105 | |
| Letter from H.M. Hobson Ltd. acknowledging receipt of a graph for a liquid level mask and requesting clarification on the finish for future Telegages. | 16th Feb 1928 | Box 44 \ 2 Scan106 | |
| Query regarding a standardisation sheet for the Claudel Hobson petrol gauge, with a handwritten reply. | 1st Mar 1928 | Box 44 \ 2 Scan107 | |
| Letter from H.M. Hobson Ltd. regarding calibration of a K-S Telegage for a 40/50 Phantom car. | 22th Mar 1928 | Box 44 \ 2 Scan108 | |
| Page 2 of a letter from H.M. Hobson, Ltd. regarding the calibration and alteration of instruments. | 22th Mar 1928 | Box 44 \ 2 Scan109 | |
| Letter from H.M. Hobson, Ltd. discussing modifications to the K-S Telegage for the Phantom car. | 28th Mar 1928 | Box 44 \ 2 Scan110 | |
| Letter concerning the return of gauges for alteration and the calibration of a tank. | 28th Mar 1928 | Box 44 \ 2 Scan111 | |
| Letter to Messrs. H.M. Hobson Ltd. regarding the despatch of a petrol tank for calibrating a Claudel gauge for a 40/50 HP car. | 2nd Apr 1928 | Box 44 \ 2 Scan112 | |
| The extra cost for installing a petrol indicator on the dashboard. | 25th Apr 1928 | Box 44 \ 2 Scan113 | |
| Brief internal query regarding the status of a Claudel Hobson petrol gauge. | 21th Apr 1928 | Box 44 \ 2 Scan114 | |
| Cost and reliability implications of making dashboard petrol gauges a standard feature. | 24th Apr 1928 | Box 44 \ 2 Scan115 | |
| Modifications to the Hobson petrol gauge. | 24th Apr 1928 | Box 44 \ 2 Scan116 | |
| Brief memo acknowledging a previous communication regarding the Hobson Petrol Gauge. | 25th Apr 1928 | Box 44 \ 2 Scan117 | |
| Advantages of installing a petrol level indicator on the instrument board. | 1st May 1928 | Box 44 \ 2 Scan118 | |
| The disadvantages and costs of instrument board gauges. | 15th May 1928 | Box 44 \ 2 Scan119 | |
| Letter from H.M. Hobson, Ltd. about a replacement K-S Telegage dash instrument. | 15th May 1928 | Box 44 \ 2 Scan120 | |
| Page 2 of a letter from H.M. Hobson, Ltd. concerning the safety conditions of an instrument. | 15th May 1928 | Box 44 \ 2 Scan121 | |
| Letter to H.M. Hobson Ltd. regarding the performance of a fuel gauge during a 3000-mile road test. | 16th May 1928 | Box 44 \ 2 Scan122 | |
| Letter from H.M. Hobson Ltd. regarding the testing and replacement of a petrol telegage. | 17th May 1928 | Box 44 \ 2 Scan123 | |
| Letter detailing the correct procedure for installing a new instrument gauge and conclusions from tests. | 17th May 1928 | Box 44 \ 2 Scan124 | |
| Letter from H.M. Hobson, Ltd. detailing design modifications to a dashboard instrument and gauge. | 17th May 1928 | Box 44 \ 2 Scan125 | |
| Blueprint for a 40-50 HP Sprengel Air Line Unit with manufacturing and handling instructions. | 14th May 1928 | Box 44 \ 2 Scan126 | |
| Method and diagram for testing the accuracy of a dash instrument using a test rig. | 15th May 1928 | Box 44 \ 2 Scan127 | |
| Drawing of a dash-mounted fuel gauge unit with specifications for its finish. | 18th May 1928 | Box 44 \ 2 Scan128 | |
| Blueprint for a 4 Cup D'Heurel Tanit unit with calibration data. | 15th May 1926 | Box 44 \ 2 Scan129 | |
| Forwarding drawings for a Telegauge Set for the 40/50 HP Chassis. | 22th May 1928 | Box 44 \ 2 Scan130 | |
| Blueprint for a 40-50HP 20-gallon De Luxe Dash Unit fuel gauge. | 12th May 1928 | Box 44 \ 2 Scan131 | |
| Method for testing the accuracy of a dash instrument using a test rig. | 15th May 1928 | Box 44 \ 2 Scan132 | |
| Drawing for a 4 Cup Sprengel Tank Unit with capacity calibrations. | 15th May 1928 | Box 44 \ 2 Scan133 | |
| Drawing of an Air Line Unit for a 40-50 HP model (Sprengel). | 4th May 1925 | Box 44 \ 2 Scan134 | |
| Position of a 2-level device in the petrol tank and the design of the sump. | 23th May 1928 | Box 44 \ 2 Scan135 | |
| Fitting of a K.S. Telegauge petrol gauge to the Phantom petrol tank. | 24th May 1928 | Box 44 \ 2 Scan136 | |
| The cost and standardization of the K.S. Petrol Gauge for the Phantom model. | 25th May 1928 | Box 44 \ 2 Scan137 | |
| Cost comparison and recommendation concerning the standardisation of the Hobson petrol gauge over the existing one. | 30th May 1928 | Box 44 \ 2 Scan138 | |
| Brief memo acknowledging correspondence about a petrol gauge and expecting a standardisation sheet. | 5th Jun 1928 | Box 44 \ 2 Scan139 | |
| The standardisation of the K-S petrol gauge for 20 HP and 40/50 HP models. | 7th Jun 1928 | Box 44 \ 2 Scan140 | |
| Letter to Claudel-Hobson Ltd. regarding satisfaction with the 40/50 HP dashboard unit and a request for a modified 20 HP unit. | 7th Jun 1928 | Box 44 \ 2 Scan141 | |
| Letter from H.M. Hobson, Ltd. regarding the satisfactory results of a Hobson K-S Telegage set and requirements for a 20 HP car. | 8th Jun 1928 | Box 44 \ 2 Scan142 | |
| Page 2 of a letter from H.M. Hobson, Ltd. discussing fitting a Sprengel type tank and dash unit to a 20 HP model. | 8th Jun 1928 | Box 44 \ 2 Scan143 | |
| Letter discussing the calibration and fitting of a Hobson petrol gauge for the 20 HP car. | 11th Jun 1928 | Box 44 \ 2 Scan144 | |
| Letter from H.M. Hobson, Ltd. regarding the fitting of a K-S Petrol Telegage. | 13th Jun 1928 | Box 44 \ 2 Scan145 | |
| Letter from a supplier discussing modifications to a fuel gauge and overflow pipe for a specific chassis. | 13th Jun 1928 | Box 44 \ 2 Scan146 | |
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