| Description | Date | Identifier | |
| List of required instruments for production testing and adjustment of lighting, starting, and ignition systems. | 10th Jan 1920 | Box 33 \ 4 Scan181 | |
| Request to order a portable D.C. volt ammeter for self-starter test tackle. | 27th Jan 1920 | Box 33 \ 4 Scan182 | |
| Letter from Weston Electrical Instrument Co. Ltd. concerning delays to orders for a Mil-Ammeter, Multiplier, and Testing Set. | 18th Feb 1920 | Box 33 \ 4 Scan183 | |
| Specifications and reading correction factors for box instruments 42 and 92. | 19th Feb 1920 | Box 33 \ 4 Scan184 | |
| Test and calibration data for Instrument 92, detailing voltage, amperage, resistance, and range correction values. | 19th Feb 1920 | Box 33 \ 4 Scan185 | |
| Page detailing deduction percentages for various volt and ampere range readings, with a note on instrument care. | 21th Feb 1920 | Box 33 \ 4 Scan186 | |
| Wiring diagram of connections for a Weston Box Instrument No. 92. | 21th Feb 1920 | Box 33 \ 4 Scan187 | |
| Note on the holving resistance ratio for Weston Instrument No. 92. | 22th Mar 1920 | Box 33 \ 4 Scan188 | |
| Confirming the receipt of a Mil-Ammeter model 370 from The Weston Electrical Instrument Co. Ltd. | 29th Mar 1920 | Box 33 \ 4 Scan189 | |
| Receipt of various parts from external suppliers. | 22th Apr 1920 | Box 33 \ 4 Scan190 | |
| Table of results for halving resistance with a new box on a 15-volt range. | 20th May 1920 | Box 33 \ 4 Scan191 | |
| Internal instruction sheet requesting a specific type of box instrument. | 12th Jun 1920 | Box 33 \ 4 Scan192 | |
| Request to order a Weston box type combined ammeter and voltmeter for the Experimental Department. | 14th Jun 1920 | Box 33 \ 4 Scan193 | |
| Letter from Weston Electrical Instrument Co., Ltd. about their Model 280 Garage Testing Set. | 9th Jun 1920 | Box 33 \ 4 Scan194 | |
| Order request for a Weston box type combined ammeter and voltmeter for the Experimental Department. | 3rd Aug 1920 | Box 33 \ 4 Scan195 | |
| Sending a Weston box type instrument for re-adjustment and chasing an overdue order for another. | 10th Aug 1920 | Box 33 \ 4 Scan196 | |
| Instruction sheet regarding the receipt of a boxed instrument with external shunts from the stores. | 20th Aug 1920 | Box 33 \ 4 Scan197 | |
| The return of a faulty Weston instrument for readjustment after a failed internal repair attempt. | 22th Sep 1920 | Box 33 \ 4 Scan198 | |
| Confirmation of receiving a repaired instrument from the Weston Instrument Co. | 8th Oct 1920 | Box 33 \ 4 Scan199 | |
| Specification sheet for an Electrical Experimental Department instrument, the Weston Standard Milli-Volt-Ammeter Model 1. | 1st Dec 1920 | Box 33 \ 4 Scan200 | |
| Specification table for a Weston Model 1 Milli-Volt-ammeter, detailing connections, ranges, and resistances. | 1st Dec 1920 | Box 33 \ 4 Scan201 | |
| Specification table for a Weston Milli-Volt-Ammeter, Model 1. | 1st Aug 1932 | Box 33 \ 4 Scan202 | |
| Specification table for a Weston Box Instrument Model 163, detailing its electrical properties and connections. | 1st Aug 1932 | Box 33 \ 4 Scan203 | |
| Specification table and wiring diagram for a Weston Box Instrument Model 163. | 1st Jan 1935 | Box 33 \ 4 Scan204 | |
| Specification table and wiring diagram for a Weston Box Instrument, Model 163. | 1st Jan 1935 | Box 33 \ 4 Scan205 | |
| Specification table and wiring diagram for a Weston Box Instrument, Model 163. | 28th Jan 1921 | Box 33 \ 4 Scan206 | |
| Instructions for determining the milli-volts and milli-amperes for a Weston Electrical R.P.M. Counter. | 28th Jan 1921 | Box 33 \ 4 Scan207 | |
| Instructions and measurements for a Weston Voltmeter. | 7th Dec 1921 | Box 33 \ 4 Scan208 | |
| Letter of inquiry to The Weston Electric Instrument Co. regarding a Model 375 Weston Galvanometer. | 1st Dec 1922 | Box 33 \ 4 Scan209 | |
| Copy of a letter from Weston Electrical Instrument Co. Ltd. regarding a model 375 Galvanometer and its price. | 2nd Dec 1922 | Box 33 \ 4 Scan210 | |
| Request to order a Weston Model 375 Galvanometer for insulation leakage tests. | 8th Dec 1922 | Box 33 \ 4 Scan211 | |
| The despatch of a Weston Ammeter to its makers for repair. | 18th Dec 1922 | Box 33 \ 4 Scan212 | |
| Specifications for a Weston Galvanometer Model 375, No. 8985. | 26th Oct 1923 | Box 33 \ 4 Scan213 | |
| The overhaul of a Weston milli-voltmeter and the addition of a new shunt. | 8th Jan 1924 | Box 33 \ 4 Scan214 | |
| Instructions for the re-calibration of a cell voltmeter. | 21th Feb 1924 | Box 33 \ 4 Scan215 | |
| Specifications for a Weston Galvanometer Model 375 and a Small Cell Testing Voltmeter. | 28th Apr 1924 | Box 33 \ 4 Scan216 | |
| Instruction sheet detailing the calculation for the resistance of a Weston Galvanometer. | 28th Apr 1924 | Box 33 \ 4 Scan217 | |
| Return of a Weston cell voltmeter to the makers for repair. | 15th Apr 1925 | Box 33 \ 4 Scan218 | |
| Sending a Weston Millivoltmeter to the makers for a new needle and overhaul. | 29th Apr 1925 | Box 33 \ 4 Scan219 | |
| Re-calibration of a Weston millivoltmeter and its associated volt box. | 30th Apr 1925 | Box 33 \ 4 Scan220 | |
| Return of a faulty Weston Cell Voltmeter to its makers due to a sticking needle. | 26th May 1925 | Box 33 \ 4 Scan221 | |
| Record of resistance measurements for various ampere shunts of a Weston Instrument. | 20th Jun 1925 | Box 33 \ 4 Scan222 | |
| Specification sheet for Weston Instrument No. 336. | 4th Jul 1925 | Box 33 \ 4 Scan223 | |
| Test report and specifications for a Bijur-Weston Instrument 23992. | 16th Oct 1925 | Box 33 \ 4 Scan224 | |
| Specifications for a Weston R.P.M. Indicator, instrument model 269, No. 336. | 22th Oct 1925 | Box 33 \ 4 Scan225 | |
| Electrical characteristics for a Weston R.P.M. Indicator, Instrument Model 267. | 5th Apr 1926 | Box 33 \ 4 Scan226 | |
| Requesting deflection temperature calibration for a whitemetal bearing and thermocouple arrangement. | 27th Sep 1926 | Box 33 \ 4 Scan227 | |
| Front cover of a brochure for the Weston Galvanometer, Model 375. | 1st Oct 1921 | Box 33 \ 4 Scan228 | |
| Product specification leaflet for the Weston Galvanometer, Model 375. | 7th Oct 1926 | Box 33 \ 4 Scan229 | |
| Order for a Weston Galvanometer Model 375. | 7th Oct 1926 | Box 33 \ 4 Scan230 | |
| Faulty Weston Box Instrument No.42 which is being returned for overhaul. | 14th Dec 1926 | Box 33 \ 4 Scan231 | |
| Description of the Cambridge Instrument Co's Recording Thermometer No. 27591. | 7th Feb 1927 | Box 33 \ 4 Scan232 | |
| Requesting repair and scale modification for a Weston voltmeter from revs per minute to milliamperes. | 16th Mar 1927 | Box 33 \ 4 Scan233 | |
| Test and calibration data for a Weston A.C. Milliammeter No. 1068. | 16th Mar 1927 | Box 33 \ 4 Scan234 | |
| Calibration data sheet for a Weston A.C. Milliammeter No. 1068. | 10th May 1927 | Box 33 \ 4 Scan235 | |
| Laboratory report on the calibration of a galvanometer and couple, showing temperature readings. | 10th May 1927 | Box 33 \ 4 Scan236 | |
| Requesting the return of a damaged Weston Cell Voltmeter to the makers for repair. | 1st Jun 1927 | Box 33 \ 4 Scan237 | |
| Calibration data for a Weston Galvanometer No.8985 Model No.375. | 22th Jun 1927 | Box 33 \ 4 Scan238 | |
| From Weston Electrical Instrument Co. regarding the repair of a Model 267 Voltmeter. | 27th Jun 1927 | Box 33 \ 4 Scan239 | |
| Calibration and resistance data for a Weston A.C. Milliammeter No. 1068. | 22th Sep 1927 | Box 33 \ 4 Scan240 | |
| Urgent internal request to obtain a Weston Galvanometer for experimental testing. | 30th Sep 1927 | Box 33 \ 4 Scan241 | |
| Faulty Weston milliammeter and its return for repair. | 7th Oct 1927 | Box 33 \ 4 Scan242 | |
| Specifications for two Weston Galvanometer Model 375 instruments. | 20th Oct 1927 | Box 33 \ 4 Scan243 | |
| The examination of a faulty Weston Dynamometer and suggestion for its repair. | 19th May 1928 | Box 33 \ 4 Scan244 | |
| Issues with a Weston Milli-voltmeter and its return for re-calibration. | 1st Jul 1929 | Box 33 \ 4 Scan245 | |
| Return of a Weston Milli-Voltmeter for re-calibration. | 2nd Jul 1929 | Box 33 \ 4 Scan246 | |
| Specification table for a Weston standard Milli-Volt-Ammeter, detailing its electrical properties and connections. | 13th Jun 1929 | Box 33 \ 4 Scan247 | |
| Arranging the return of a faulty Weston Galvanometer for repair. | 20th Jan 1931 | Box 33 \ 4 Scan248 | |
| Required overhaul and repair of a damaged Weston Box Instrument Model 163 No. 98. | 5th Nov 1932 | Box 33 \ 4 Scan249 | |
| Request to send a faulty Weston Instrument Model 163 No. 40 for overhaul and calibration. | 18th May 1933 | Box 33 \ 4 Scan250 | |
| Damaged Weston dynamometer instrument requiring overhaul and repair. | 28th Jun 1933 | Box 33 \ 4 Scan251 | |
| Running issues caused by wheel discs and proposing testing to find a solution. | 8th Apr 1930 | Box 33 \ 5 Scan001 | |
| Faulty Barker wheel discs which prevent the use of a wheel spanner. | 5th Jun 1930 | Box 33 \ 5 Scan002 | |
| Confirming corrective work on Barker wheel discs will be carried out free of cost. | 12th Jun 1930 | Box 33 \ 5 Scan003 | |
| Obtaining a set of wheel discs for Bensport & Peregrine models and sending a sample to Messrs Park Ward & Co. | 9th Jan 1933 | Box 33 \ 5 Scan004 | |
| Letter from the Air Department regarding the suitability testing of an electrical speed indicator outfit for aero engines. | 20th Jun 1915 | Box 33 \ 5 Scan005 | |
| Experiments with a magneto generator and Weston voltmeter for electrical speed indicators. | 24th Jun 1915 | Box 33 \ 5 Scan006 | |
| Continued memorandum discussing adjusting magneto voltage and diagnosing errors in generators or voltmeters. | 24th Jun 1919 | Box 33 \ 5 Scan007 | |
| Requesting the order of a Hasler Revolution Counter for the Experimental Department. | 17th Oct 1916 | Box 33 \ 5 Scan008 | |
| Extract detailing parts fitted to car 7 CA for Mr. Royce, with notes on rear springs, shock absorbers, and a speed indicator. | 15th Jun 1917 | Box 33 \ 5 Scan009 | |
| Requesting an update on the completion of parts for a Magneto Type Revolution Recorder for Capt. Briggs' car. | 29th Jul 1917 | Box 33 \ 5 Scan010 | |
| Quotation from The British Wright Company for four Ogilvie Air Speed Indicators. | 24th Oct 1917 | Box 33 \ 5 Scan011 | |
| Request for an additional Hasler revolution counter for the Experimental Department. | 15th Apr 1918 | Box 33 \ 5 Scan012 | |
| Suggestion for a new electrical speedometer design that also records mileage. | 8th Apr 1919 | Box 33 \ 5 Scan013 | |
| Outlining the advantages of a new electrical speedometer and rev counter instrument. | 16th Apr 1919 | Box 33 \ 5 Scan014 | |
| Proposal for an electrical speedometer that also registers miles travelled for the chassis. | 8th Apr 1919 | Box 33 \ 5 Scan015 | |
| Advantages of fitting a new electrical speedometer directly to the transmission. | 1st Apr 1919 | Box 33 \ 5 Scan016 | |
| Cover sheet regarding a suggestion for an electrical speedometer for the chassis. | 12th May 1919 | Box 33 \ 5 Scan017 | |
| Possibility of patenting an electrical mileage register and speed indicator. | 29th May 1919 | Box 33 \ 5 Scan018 | |
| Noting the requirement of a Hasler Speed Indicator for tests of the Starter Motor. | 21th Aug 1919 | Box 33 \ 5 Scan019 | |
| Inquiry about the availability of an electrical speed indicator (voltmeter) calibrated in Revolutions instead of Volts. | 16th Oct 1919 | Box 33 \ 5 Scan020 | |
| Requesting the urgent repair and return of a Hasler revolution counter. | 22th Oct 1919 | Box 33 \ 5 Scan021 | |
| Inquiry chasing a reply about the availability of a specially calibrated aero engine electrical speed indicator. | 29th Oct 1919 | Box 33 \ 5 Scan022 | |
| Advertisement for a dashboard-mounted manifold ignition indicator and plug tester. | 3rd Jun 1920 | Box 33 \ 5 Scan023 | |
| Request to obtain a new Hasler Revolution Counter for the Electrical Experimental Department. | 3rd Jun 1920 | Box 33 \ 5 Scan024 | |
| Sending a previous Hasler revolution counter to the makers for readjustment. | 16th Jun 1920 | Box 33 \ 5 Scan025 | |
| The return of a Hasler Revolution Counter for repair. | 8th Jun 1921 | Box 33 \ 5 Scan026 | |
| The return of a faulty Hasler speedometer to the manufacturer for repair. | 19th Aug 1921 | Box 33 \ 5 Scan027 | |
| Instructions for correcting readings from a Haslar Speed Indicator. | 31th Aug 1921 | Box 33 \ 5 Scan028 | |
| Requesting the repair of a Hasler revolution counter due to the needle sticking. | 14th Mar 1922 | Box 33 \ 5 Scan029 | |
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