| Description | Date | Identifier | |
| And comparing various design schemes for fuel gauges and their components. | 3rd Aug 1920 | Box 75 \ 2 scan0074 | |
| Alternative designs for a tank float and indicator mechanism. | 3rd Aug 1920 | Box 75 \ 2 scan0075 | |
| Schemes and difficulties related to the petrol level indicator and reserve supply valve. | 5th Aug 1920 | Box 75 \ 2 scan0076 | |
| Different valve design schemes and a suggestion for a simpler, more visible valve for the driver. | 5th Aug 1920 | Box 75 \ 2 scan0077 | |
| Scheme for a petrol level indicator and reserve supply device. | 5th Aug 1920 | Box 75 \ 2 scan0078 | |
| Examination of the Packard car's petrol tank reserve compartment system. | 1st Aug 1920 | Box 75 \ 2 scan0079 | |
| Cablegram from Claude Johnson outlining decisions on parts for the Springfield, Mass. plant. | 6th Aug 1920 | Box 75 \ 2 scan0080 | |
| Urgent internal memo requesting the original drawing for a petrol level gauge and reserve fuel device for amendments. | 1st Aug 1920 | Box 75 \ 2 scan0081 | |
| And comparing different design proposals for a petrol gauge. | 10th Aug 1920 | Box 75 \ 2 scan0082 | |
| Testing of a glass bezel and considering the hardness of English versus French plate-glass. | 10th Aug 1920 | Box 75 \ 2 scan0083 | |
| Modifications to a petrol tank, level indicator, and reserve fuel device based on schemes 540 and 538. | 17th Aug 1920 | Box 75 \ 2 scan0084 | |
| Suggesting modifications to a reserve device, top cap, and pipe routing for scheme 538. | 17th Aug 1920 | Box 75 \ 2 scan0085 | |
| Alternative design for a reserve fuel valve operating device, suggested by Mr. Royce. | 9th Aug 1920 | Box 75 \ 2 scan0086 | |
| Sketch of an operating device for a reserve fuel valve, with a protective cover and employing a sylphon tube. | 19th Aug 1920 | Box 75 \ 2 scan0087 | |
| Issues and proposed modifications for a petrol tank filler and cap, focusing on ventilation and sealing. | 23th Aug 1920 | Box 75 \ 2 scan0088 | |
| The design and fittings of a petrol gauge and luggage carrier. | 23th Aug 1920 | Box 75 \ 2 scan0089 | |
| Extract from a report discussing the design and production of petrol tanks for America. | 27th Aug 1920 | Box 75 \ 2 scan0090 | |
| Design suggestions for a double level device side filler and petrol gauge. | 28th Aug 1920 | Box 75 \ 2 scan0091 | |
| Minor modifications for a petrol tank under scheme 570. | 15th Sep 1920 | Box 75 \ 2 scan0092 | |
| Specifications for securing a dial and the design of a nut plate, including sketches. | 15th Sep 1920 | Box 75 \ 2 scan0093 | |
| The fitting of parts to a 6.EX chassis at the coach-builders, Park Ward Co. | 28th Oct 1920 | Box 75 \ 2 scan0094 | |
| Shipping an experimental car to the U.S.A. for winter testing, detailing new parts to be fitted. | 1st Nov 1920 | Box 75 \ 2 scan0095 | |
| The fitting of new parts to the 6.EX car at Park Wards, Willesden. | 13th Nov 1920 | Box 75 \ 2 scan0096 | |
| Extract from a report on the petrol level indicator, syphon tubes, and wiring arrangement. | 15th Nov 1920 | Box 75 \ 2 scan0097 | |
| Two proposed schemes for fitting the rear number plate and lamp on a chassis with a rear-mounted petrol tank. | 1st Dec 1920 | Box 75 \ 2 scan0098 | |
| Experimental parts fitted to chassis 4.EX. | 2nd Dec 1920 | Box 75 \ 2 scan0099 | |
| Problems with a petrol level indicator, including erratic readings and fuel leaks from the dial. | 10th Feb 1921 | Box 75 \ 2 scan0100 | |
| Continuation of a document discussing the arrangement of standard American petrol gauges. | 10th Feb 1921 | Box 75 \ 2 scan0101 | |
| Delays on 'R' series materials pending potential improvements from the Experimental Department. | 11th Feb 1921 | Box 75 \ 2 scan0102 | |
| 6.EX car, detailing a fix for the petrol indicator and parts needed for completion. | 2nd Feb 1921 | Box 75 \ 2 scan0103 | |
| Mr. Royce's suggestions for modifying the petrol level indicator and spare fuel device. | 28th Aug 1920 | Box 75 \ 2 scan0104 | |
| Design alterations for a tank's standpipe flange, lid, sump, and drain plug, accompanied by sketches. | 28th Aug 1920 | Box 75 \ 2 scan0105 | |
| With a sketch detailing design modifications to a fuel indicator, needle valve, and filter. | 28th Aug 1920 | Box 75 \ 2 scan0106 | |
| Continued page detailing the construction of a copper-plated cork float and Mr. Royce's opinion on petrol tank baffles. | 28th Aug 1920 | Box 75 \ 2 scan0107 | |
| Alternative design scheme for the petrol gauge and reserve supply tank for the 40/50 chassis. | 1st Oct 1920 | Box 75 \ 2 scan0108 | |
| Inadequacy of luminous paint on instrument needles and proposing a dedicated instrument board light as a solution. | 28th May 1923 | Box 75 \ 2 scan0109 | |
| Design and location of a reserve petrol tank tap. | 19th Dec 1923 | Box 75 \ 2 scan0110 | |
| Standardisation of the reserve petrol arrangement on the 20 and 40/50 models. | 28th Dec 1923 | Box 75 \ 2 scan0111 | |
| Hand-drawn schematic for a pressure-based petrol level measuring device. | 28th Jan 1920 | Box 75 \ 2 scan0112 | |
| Proposal for a petrol gauge that measures the fuel level based on air pressure differentials. | 28th Jan 1920 | Box 75 \ 2 scan0113 | |
| Technical discussion on the design and implementation of a petrol gauge for a fuel tank. | 3rd Feb 1920 | Box 75 \ 2 scan0114 | |
| The design and manufacture of a small, thick glass window for a gauge. | 3rd Feb 1920 | Box 75 \ 2 scan0115 | |
| 40/50 HP petrol level indicator and the effect of tank baffles on its reading. | 17th Mar 1921 | Box 75 \ 2 scan0116 | |
| The design and function of a magnetic petrol gauge, clipped from 'Motor' magazine. | 17th Mar 1914 | Box 75 \ 2 scan0117 | |
| Letter from Simms Motor Units Ltd regarding the testing of a magnetic gauge. | 12th May 1914 | Box 75 \ 2 scan0118 | |
| Advertising brochure for 'Triumph' magnetic gasolene tank gauges by the Boston Auto Gage Company. | 12th May 1914 | Box 75 \ 2 scan0119 | |
| Plate showing the installation of various models of 'Triumph' magnetic gasoline tank gages manufactured by the Boston Auto Gage Company. | 5th Aug 1914 | Box 75 \ 2 scan0120 | |
| Letter from Simms Motor Units Ltd. regarding a sample magnetic petrol gauge sent for testing purposes. | 5th Aug 1914 | Box 75 \ 2 scan0121 | |
| Letter from Simms Motor Units Ltd regarding the availability of six SD 6 magnetos and a Magnetic Petrol Gauge sample. | 13th Aug 1914 | Box 75 \ 2 scan0122 | |
| Correspondence regarding sending a sample Simms Magnetic Petrol Tank Gauge for testing. | 14th Aug 1914 | Box 75 \ 2 scan0123 | |
| Letter to Simms Motor Units acknowledging receipt of a magnetic petrol gauge for testing. | 15th Aug 1914 | Box 75 \ 2 scan0124 | |
| Letter from Simms Motor Units Ltd regarding a follow-up on sample petrol gauges. | 18th Sep 1914 | Box 75 \ 2 scan0125 | |
| Letter to Simms Motor Units, Ltd. concerning a delay in testing a petrol gauge due to the dislocation of trade. | 30th Sep 1914 | Box 75 \ 2 scan0126 | |
| Letter from Simms Motor Units Ltd. concerning the testing of a sample petrol gauge. | 1st Oct 1914 | Box 75 \ 2 scan0127 | |
| Experimental instruction sheet detailing modifications and part removals from chassis 2300. | 22th Oct 1914 | Box 75 \ 2 scan0128 | |
| The 'Triumph' magnetic petrol tank gauge. | 7th Jan 1915 | Box 75 \ 2 scan0129 | |
| The suitability of a gauge, noting its lack of accuracy and small, hard-to-read dial. | 30th Oct 1919 | Box 75 \ 2 scan0130 | |
| Request to obtain a sample of a 'Magnetic Petrol Indicator' from Mr. F.R. Sims or an alternative magnetic indicator. | 30th Oct 1919 | Box 75 \ 2 scan0131 | |
| Request to order an additional Magnetic Petrol Indicator with a side-mounted dial from Simms Motor Units Co. | 31th Oct 1919 | Box 75 \ 2 scan0132 | |
| The order of a No.2 Magneto Petrol Gauge and a Sims 'J.R' Side Gauge. | 11th Nov 1919 | Box 75 \ 2 scan0133 | |
| Letter from Simms Motor Units Ltd. regarding the supply and pricing of magnetic petrol gauges. | 7th Nov 1919 | Box 75 \ 2 scan0134 | |
| Letter to Simms Motor Units Ltd. regarding the testing of gauges and requesting a quote for a distance-reading gauge. | 13th Nov 1919 | Box 75 \ 2 scan0135 | |
| Letter from Simms Motor Units Ltd. regarding the supply of a petrol gauge based on a sketch. | 20th Nov 1919 | Box 75 \ 2 scan0136 | |
| Letter from Simms Motor Units regarding the despatch and calibration of two petrol gauges. | 4th Dec 1919 | Box 75 \ 2 scan0137 | |
| Letter to Simms Motor Units Ltd. regarding the testing of two petrol gauges on an experimental car. | 10th Dec 1919 | Box 75 \ 2 scan0138 | |
| Two petrol gauges from Simms Motor Units Ltd. and the subsequent need for an official order. | 10th Dec 1919 | Box 75 \ 2 scan0139 | |
| Interim use of a magnetic petrol gauge for special orders, pending the perfection of a standard in-house design. | 19th Jan 1920 | Box 75 \ 2 scan0140 | |
| Proposal to use Simms Magnetic Petrol Gauges as a temporary solution until a standard arrangement is ready. | 20th Jan 1920 | Box 75 \ 2 scan0141 | |
| Letter to Simms Motor Units Ltd. regarding the supply of vertical magnetic petrol gauges for customer tanks. | 20th Jan 1920 | Box 75 \ 2 scan0142 | |
| Letter from Simms Motor Units Ltd. acknowledging an order and advising of a delivery delay. | 29th Jan 1920 | Box 75 \ 2 scan0143 | |
| Request to the Stores department for the loan of a Simms Petrol Lever Indicator for the Experimental Drawing Office. | 13th Feb 1920 | Box 75 \ 2 scan0144 | |
| Sending original drawings for the Simm's Petrol Indicator for the 40/50 Chassis and requesting production. | 26th Feb 1920 | Box 75 \ 2 scan0145 | |
| Faulty Simms magnetic petrol gauges which show 'EMPTY' with two gallons remaining, a serious issue for cars in France due to the 'Octroi' tax system. | 23th Jun 1920 | Box 75 \ 2 scan0146 | |
| Faulty tank gauges from the Simms Company and proposing a design solution. | 23th Jun 1920 | Box 75 \ 2 scan0147 | |
| Response concerning the accuracy and intended use of the Simms Magnetic Petrol Gauge, specifically for 'Octroi' purposes in France. | 4th Jun 1920 | Box 75 \ 2 scan0148 | |
| Supply, return, and fitting of Simms Magnetic Petrol Gauges, also noting a design issue. | 24th Jun 1920 | Box 75 \ 2 scan0149 | |
| The accuracy of Simms Magnetic Petrol Gauges and a proposal for a more intelligible marking system. | 24th Jun 1920 | Box 75 \ 2 scan0150 | |
| Provision of a Simms petrol gauge for use with French Octroi tax regulations. | 28th Jun 1920 | Box 75 \ 2 scan0151 | |
| Need for and design of a new petrol gauge, the Simms Magnetic Gauge, for increased accuracy. | 28th Jun 1920 | Box 75 \ 2 scan0152 | |
| Suggestions for a modified petrol tank level indicator to comply with French regulations. | 3rd Aug 1920 | Box 75 \ 2 scan0153 | |
| Letter received from The Simms Motor Units Ltd. about a petrol indicator for a 14 3/4 gallon tank. | 19th Sep 1921 | Box 75 \ 2 scan0154 | |
| Letter from Simms Motor Units regarding the calibration of a petrol indicator for a 14 3/4 gallon tank. | 15th Sep 1921 | Box 75 \ 2 scan0155 | |
| Failures with the 'Simms' petrol level indicator due to condensation and rust. | 9th Sep 1921 | Box 75 \ 2 scan0156 | |
| Quoting a letter from Simms Motor Units regarding issues with their petrol level indicators. | 29th Sep 1921 | Box 75 \ 2 scan0157 | |
| Unsuitability of the Simms Petrol Level Indicator and the need to source an alternative moving arm type gauge for the Goshawk 11 model. | 1st Oct 1921 | Box 75 \ 2 scan0158 | |
| Letter to O.S. Speedometer Co. about experimentally testing a new dashboard petrol gauge. | 9th Aug 1926 | Box 75 \ 2 scan0159 | |
| Letter from O.S. Speedometer Co. Ltd. regarding a dashboard reading petrol gauge. | 10th Aug 1926 | Box 75 \ 2 scan0160 | |
| Letter to The O.S. Speedometer Co Ltd. providing blueprints for a tank and dashboard and requesting a lead time. | 23th Aug 1926 | Box 75 \ 2 scan0161 | |
| Letter from The O.S. Speedometer Co. Ltd. acknowledging receipt of blueprints and confirming the preparation of gauges. | 24th Aug 1926 | Box 75 \ 2 scan0162 | |
| Requesting further information on when parts are likely to be ready. | 13th Sep 1926 | Box 75 \ 2 scan0163 | |
| Letter to The O.S. Speedometer Co. Ltd. requesting an update on when parts will be ready. | 13th Sep 1926 | Box 75 \ 2 scan0164 | |
| Letter from The O.S. Speedometer Co. Ltd. requesting a petrol tank for testing a rear tank petrol gauge. | 15th Sep 1926 | Box 75 \ 2 scan0165 | |
| Photograph of an O.S. Speedometer Co. fuel gauge measuring in gallons, with its sensor unit. | 17th Sep 1926 | Box 75 \ 2 scan0166 | |
| Letter to The O.S. Speedometer Co. Ltd. regarding the delayed despatch of a tank. | 17th Sep 1926 | Box 75 \ 2 scan0167 | |
| Fitting of a new 'O.S.' Petrol Indicator from Ateliers Seignol. | 23th Sep 1926 | Box 75 \ 2 scan0168 | |
| O.S. petrol indicator, declining to modify the petrol tank and suggesting the gauge be modified instead. | 27th Sep 1926 | Box 75 \ 2 scan0169 | |
| Letter to O.S. Speedometer Co. Ltd. regarding the modification of tank baffles for a gauge. | 11th Oct 1926 | Box 75 \ 2 scan0170 | |
| Letter from The O.S. Speedometer Co. Ltd. regarding a dispute over fitting their gauge to a fuel tank. | 15th Oct 1926 | Box 75 \ 2 scan0171 | |
| Letter discussing the modification and testing of a tank and gauge. | 15th Oct 1926 | Box 75 \ 2 scan0172 | |
| Promotional leaflet for O.S. Automatic Petrol Gauges, for both visible filler-caps and dashboard mounting. | 15th Oct 1926 | Box 75 \ 2 scan0173 | |
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