| Description | Date | Identifier | |
| Letter from Rowland & Co. offering their services as manufacturers of scientific and electrical apparatus for private contract work. | 13th Mar 1919 | Box 165 \ 3 img002 | |
| Enquiries be made for an electrical instrument to measure condenser capacities. | 14th Jun 1919 | Box 165 \ 3 img003 | |
| List of required instruments for the production testing of electrical apparatus, specifically condensers and ignition coils. | 19th Aug 1919 | Box 165 \ 3 img004 | |
| Specifications for testing instruments for the main switch, starter motor, and dynamo. | 19th Aug 1919 | Box 165 \ 3 img005 | |
| Noting the requirement of a Hasler Speed Indicator for starter motor tests. | 21th Aug 1919 | Box 165 \ 3 img006 | |
| List of instruments required for production adjustment or testing of electrical systems. | 10th Jan 1929 | Box 165 \ 3 img007 | |
| Appropriate equipment for production tests of electrical apparatus. | 12th Jan 1920 | Box 165 \ 3 img008 | |
| Improved electrical testing methods for short circuits and insulation using transformers and Meggers. | 12th Jan 1920 | Box 165 \ 3 img009 | |
| The return of an instrument to the Experimental Department. | 12th Jan 1920 | Box 165 \ 3 img010 | |
| Listing the testing instruments required for production adjustment or test of starters. | 12th Jan 1920 | Box 165 \ 3 img011 | |
| The required instruments for production testing of ignition coils and correcting previous instructions. | 22th Jan 1920 | Box 165 \ 3 img012 | |
| Continuation of a document justifying the need for a third testing instrument for the production testing department. | 22th Jan 1920 | Box 165 \ 3 img013 | |
| Requesting the order of a portable D.C. volt ammeter for self-starter testing. | 27th Jan 1920 | Box 165 \ 3 img014 | |
| Internal request to order three electrical instruments from S. Smith & Sons for the Experimental Department. | 6th Feb 1920 | Box 165 \ 3 img015 | |
| The receipt of various parts and components from multiple suppliers for experiments. | 19th Feb 1920 | Box 165 \ 3 img016 | |
| To Mr. Ellis requesting the re-adjustment of a large ammeter and shunt obtained from the Metallite Company. | 23th Feb 1920 | Box 165 \ 3 img017 | |
| Supply and design of a Lucas battery indicator. | 26th Feb 1920 | Box 165 \ 3 img018 | |
| Instruction sheet detailing the measurement of a box instrument, model 163, number 98. | 20th Aug 1920 | Box 165 \ 3 img019 | |
| Requesting that the instrument number be recorded alongside observations during electrical experimental work. | 29th Oct 1920 | Box 165 \ 3 img020 | |
| Re-use of instruments, detailing associated calibration indexes, tables, and usage instructions. | 1st Dec 1920 | Box 165 \ 3 img021 | |
| Guideline specifying three degrees of accuracy for instrument measurements and calibration. | 11th Dec 1920 | Box 165 \ 3 img022 | |
| Guide on understanding and recording zero errors and zero corrections for instrument readings. | 1st Dec 1920 | Box 165 \ 3 img023 | |
| Table of specifications for electrical experimental department instruments. | 1st Dec 1920 | Box 165 \ 3 img024 | |
| Specifications and connection diagrams for a Weston Millivolt-Ammeter Model 1. | 11th Aug 1930 | Box 165 \ 3 img025 | |
| Specification table for a Weston Milli-Volt-Ammeter Model 1, detailing its ranges and resistances. | 11th Aug 1930 | Box 165 \ 3 img026 | |
| Specification and connection diagram for a Weston Model 163 Instrument Box. | 1st Aug 1919 | Box 165 \ 3 img027 | |
| Electrical specifications and wiring diagram for a Weston Box Instrument Model 163. | 21th Aug 1929 | Box 165 \ 3 img028 | |
| Specification table and connection diagram for a Weston Instrument, Model 163. | 11th Aug 1930 | Box 165 \ 3 img029 | |
| Specification table for a Weston Box Instrument Model 163 with its electrical characteristics and connection diagrams. | 31th Dec 1920 | Box 165 \ 3 img030 | |
| From EFC to St. discussing revisions to the Electrical Instruction Book. | 31th Dec 1920 | Box 165 \ 3 img031 | |
| Wording of electrical safety instructions, specifically regarding shock hazards from the chassis and covering live terminals. | 31th Dec 1920 | Box 165 \ 3 img032 | |
| Instructions for testing the milli-volt and milli-ampere readings for a Weston Electrical R.P.M. Counter. | 28th Jan 1921 | Box 165 \ 3 img033 | |
| Request to obtain particulars and prices for a 'MEG' insulation tester. | 22th Nov 1922 | Box 165 \ 3 img034 | |
| Product leaflet for the MEG Insulation Tester by Evershed & Vignoles. | 1st Oct 1922 | Box 165 \ 3 img036 | |
| Informational leaflet for the Evershed & Vignoles MEG Insulation Tester. | 1st Oct 1922 | Box 165 \ 3 img037 | |
| Product description for the new MEG Insulation Tester by Evershed & Vignoles Limited. | 1st Oct 1922 | Box 165 \ 3 img038 | |
| The 'MEG' Insulation Tester and its canvas carrying case. | 1st Oct 1922 | Box 165 \ 3 img039 | |
| Price, weight, and dimension list for the MEG Insulation Tester and its accessories. | 24th Nov 1922 | Box 165 \ 3 img040 | |
| Business inquiry letter requesting particulars and prices for a new Insulation Tester known as the 'Meg'. | 24th Nov 1922 | Box 165 \ 3 img041 | |
| Letter from Evershed & Vignoles Ltd. regarding a quote for a MEG Insulation Tester. | 25th Nov 1922 | Box 165 \ 3 img042 | |
| Terms and conditions of tender from electrical engineers Evershed & Vignoles Ltd. | 27th Sep 1922 | Box 165 \ 3 img043 | |
| Follow-up letter regarding a quotation for a 'MEG' tester. | 5th Jan 1923 | Box 165 \ 3 img044 | |
| Letter to S. Thomas Pemberton & Co. stating the need for a 'Meg' Tester has temporarily disappeared. | 9th Jan 1923 | Box 165 \ 3 img045 | |
| Letter to the Corporation Power Station in Derby requesting to hire a calibrated 15 HP electric motor for experimental purposes. | 15th Feb 1923 | Box 165 \ 3 img046 | |
| Letter from Evershed & Vignoles Ltd sending catalogues for switchboard instruments and insulation testers. | 31th May 1923 | Box 165 \ 3 img047 | |
| From DA to HS regarding a planimeter that has been missing for 3-4 years. | 19th Jul 1923 | Box 165 \ 3 img048 | |
| List of D.C. instruments and their principal uses for various tests. | 19th Jul 1923 | Box 165 \ 3 img049 | |
| Calibration data for a Cambridge potentiometer instrument tested at 18 and 90 millivolt ranges. | 7th Apr 1924 | Box 165 \ 3 img050 | |
| Proposed change from an American-made Weston ammeter to an English-made Elliott ammeter. | 7th Apr 1924 | Box 165 \ 3 img051 | |
| Calibration results and findings for a Cambridge Millivolt Potentiometer. | 28th Apr 1924 | Box 165 \ 3 img052 | |
| Cover page for an Elliott Brothers catalog of instruments for motor car users and manufacturers. | 28th Apr 1924 | Box 165 \ 3 img053 | |
| Catalogue page detailing specifications and pricing for Type 11 and Type 14 speedometers. | 28th Apr 1924 | Box 165 \ 3 img054 | |
| Catalogue page for Hamill Flow Meters and Wimperis Accelerometers. | 28th Apr 1924 | Box 165 \ 3 img055 | |
| Catalogue page showing motor clocks and a garage testing set with their descriptions and prices. | 28th Apr 1924 | Box 165 \ 3 img056 | |
| Catalogue page for hand-held and permanent attachment speed indicators (tachometers). | 28th Apr 1924 | Box 165 \ 3 img057 | |
| Catalogue cover for Elliott Instruments, listing various sections. | 12th Jun 1925 | Box 165 \ 3 img058 | |
| Test report on an Ediswan ammeter with a 150 ampere shunt. | 12th Jun 1925 | Box 165 \ 3 img059 | |
| Important notice from Weston Electrical Instrument Co. Ltd. regarding the handling, loss, and re-shipment of their instruments. | 1st Jun 1925 | Box 165 \ 3 img060 | |
| Calibration note for an Ediswan Voltmeter Type MC.No.62953. | 25th Jun 1927 | Box 165 \ 3 img061 | |
| Letter from A. Gallenkamp & Co. regarding a new version of their 'Alltest' multi-range instrument for laboratory use. | 1st Nov 1927 | Box 165 \ 3 img062 | |
| Letter from A. Gallenkamp & Co., Ltd. describing the features, specifications, and pricing of an 'Alltest' indicating instrument. | 17th Oct 1928 | Box 165 \ 3 img063 | |
| Letter to F. Senn Esq. requesting a price list for stop watches for accurate timing. | 17th Oct 1928 | Box 165 \ 3 img064 | |
| Photograph of a pocket watch with handwritten annotations. | 19th Oct 1928 | Box 165 \ 3 img065 | |
| Letter from a Parisian watchmaker regarding specific stopwatch models and an enclosed price list. | 19th Oct 1928 | Box 165 \ 3 img066 | |
| Quote from a Parisian watchmaker for precision stopwatches and timers. | 19th Oct 1928 | Box 165 \ 3 img067 | |
| Advertisement for a novelty 'Golfer's Watch' with a protective case. | 19th Oct 1928 | Box 165 \ 3 img068 | |
| Advertisement for a decimal stopwatch designed for factory use with the Taylor System. | 21th Dec 1928 | Box 165 \ 3 img069 | |
| The classification and record-keeping of chassis instruments. | 21th Dec 1928 | Box 165 \ 3 img070 | |
| Outlining the disadvantages of the Avometer instrument compared to Weston box type instruments. | 13th Feb 1929 | Box 165 \ 3 img071 | |
| The functionality and accuracy of an Avometer electrical instrument. | 12th Feb 1929 | Box 165 \ 3 img072 | |
| Specification sheet for a Weston Standard Milli-Volt-Ammeter. | 13th Aug 1929 | Box 165 \ 3 img073 | |
| Requesting the purchase of a Ferranti Rectifier type 253.P Alternating Current Milliammeter. | 12th Mar 1930 | Box 165 \ 3 img074 | |
| Characteristic curve graph for a Ferranti A.C. Rectifier Milli-Ammeter at an ambient temperature of 16°C. | 9th Jul 1930 | Box 165 \ 3 img075 | |
| Request to obtain a replacement pen for an Evershed and Vignoles recording voltmeter. | 9th Jul 1930 | Box 165 \ 3 img076 | |
| Inquiry about adding a 30 ampere shunt to a Weston standard laboratory instrument or quoting for a separate one. | 31th Mar 1933 | Box 165 \ 3 img077 | |
| Requesting a quote for a suitable resistance to convert a milliampere instrument into an AC voltmeter. | 3rd Jul 1933 | Box 165 \ 3 img078 | |
| Requesting the fitment of specific parts to chassis 22-EX for a standardisation test. | 6th Dec 1933 | Box 165 \ 3 img079 | |
| Telegram received by telephone regarding a letter and postponing a visit. | 5th Jan 1934 | Box 165 \ 3 img080 | |
| Letter from the owner of a 30HP car (Chassis GSK.74) offering his self-developed electric oil and petrol gauges for inspection. | 27th Jan 1934 | Box 165 \ 3 img081 | |
| Letter from W. Wykeham A. Robinson requesting a visit to the Derby works to demonstrate modified gauges. | 29th Jan 1934 | Box 165 \ 3 img082 | |
| Standardising Calorstat and Speedometer instruments across 20/25-HP, 40/50-HP, and Bentley chassis. | 29th Jan 1934 | Box 165 \ 3 img083 | |
| Letter to Wykeham A. Robinson Esq. inviting him to Derby to view some instruments. | 31th Jan 1934 | Box 165 \ 3 img084 | |
| Letter confirming a visit to the Derby works to demonstrate newly made instruments. | 3rd Feb 1934 | Box 165 \ 3 img085 | |
| Letter to Wykeham A. Robinson Esq. postponing a proposed visit to the Works. | 3rd Feb 1934 | Box 165 \ 3 img086 | |
| Letter confirming a telegram to postpone a visit and proposing alternative arrangements. | 5th Feb 1934 | Box 165 \ 3 img087 | |
| Letter discussing a potential change of date for an engagement. | 7th Feb 1934 | Box 165 \ 3 img088 | |
| Letter to Wykeham A. Robinson Esq. arranging an appointment. | 7th Feb 1934 | Box 165 \ 3 img089 | |
| Letter discussing and re-scheduling a proposed visit to the Works. | 9th Feb 1934 | Box 165 \ 3 img090 | |
| Brief letter regarding gauges and fittings for trial on a chassis. | 17th Feb 1934 | Box 165 \ 3 img091 | |
| Letter to Mr. Robinson regarding proposals for an oil level indicator and hydraulic bumpers. | 17th Feb 1934 | Box 165 \ 3 img092 | |
| Request to despatch a box of resistance units, an instrument, and a drawing to Wykeham A. Robinson after inspection. | 19th Feb 1934 | Box 165 \ 3 img093 | |
| Report from the I.A.E. Research and Standardisation Committee on a new tachometer. | 1st May 1934 | Box 165 \ 3 img094 | |
| Catalogues and patent information for electrical revolution indicators. | 3rd Jul 1934 | Box 165 \ 3 img095 | |
| Quotation from Salford Electrical Instruments Ltd. for remote indicating tachometers and generators. | 10th Jul 1934 | Box 165 \ 3 img097 | |
| The conditions of sale for goods for use in the United Kingdom, exclusive of erection. | 1st Jan 1933 | Box 165 \ 3 img098 | |
| Price quotation for two types of Electrical Tachometer A.C. Generators. | 1st Jun 1933 | Box 165 \ 3 img099 | |
| Description of G.E.C. remote indicating tachometers and their generator. | 1st Jun 1933 | Box 165 \ 3 img100 | |
| Specification sheet for electrical generators and indicators with rectangular or sector pattern dials. | 2nd Oct 1933 | Box 165 \ 3 img101 | |
| Outline drawing of a Tachometer Generator. | 2nd Oct 1933 | Box 165 \ 3 img102 | |
| Blueprint showing the arrangement and dimensions of a tachometer generator. | 24th Apr 1942 | Box 165 \ 3 img103 | |
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