| Description | Date | Identifier | |
| Adjustments to valve timing, cam forms, and valve springs. | 5th Sep 1926 | Box 33 \ 4 Scan081 | |
| Inconsistencies in timing procedures for aero engines and requesting a standardized, written scheme. | 21th Jun 1927 | Box 33 \ 4 Scan082 | |
| Production and attachment of engine timing plates. | 21th Jun 1927 | Box 33 \ 4 Scan083 | |
| Comments and suggestions on the timing of aero engines, specifically the Condor IV & VIII. | 23th Jun 1927 | Box 33 \ 4 Scan084 | |
| Technical note detailing engine timing procedures and specifications for Condor and Falcon engines. | 16th Aug 1927 | Box 33 \ 4 Scan085 | |
| Proposed scheme for checking the timing of the F.11 engine when fitted in an aeroplane. | 16th Aug 1927 | Box 33 \ 4 Scan086 | |
| Proposed change to the Condor engine valve lift curve and cam timing. | 10th Sep 1927 | Box 33 \ 4 Scan087 | |
| Comparison of different engine timing schemes depicted in circular diagrams. | 1st Aug 1927 | Box 33 \ 4 Scan088 | |
| Timing difficulties and requesting a definitive setting for the F.11 & 12 engines. | 30th Sep 1927 | Box 33 \ 4 Scan089 | |
| Timing procedures for F.11 & 12 engines, covering camshaft and magneto timing. | 6th Oct 1927 | Box 33 \ 4 Scan090 | |
| Technical note detailing engine timing settings, clearances, and marking specifications for a geared engine. | 6th Oct 1927 | Box 33 \ 4 Scan091 | |
| Allowances and potential inaccuracies in engine timing and camshaft grinding. | 10th Oct 1927 | Box 33 \ 4 Scan092 | |
| Technical memorandum detailing the procedure for timing F.11 and F.12 engines. | 10th Oct 1927 | Box 33 \ 4 Scan093 | |
| Confirming engine timing specifications for the F.11 & 12a engines following a request from the A.I.D. | 18th Oct 1927 | Box 33 \ 4 Scan094 | |
| Comparative tests of new Condor low lift, long duration camshafts on a Condor 111A engine. | 27th Nov 1927 | Box 33 \ 4 Scan095 | |
| Effects of new camshafts on valve overlap, fuel consumption, and vibration. | 4th Nov 1927 | Box 33 \ 4 Scan096 | |
| Performance comparison graph between standard and low-lift camshafts for the Condor III A engine at a 6.5:1 compression ratio. | 4th Nov 1927 | Box 33 \ 4 Scan097 | |
| Faded document page with a Print Room date stamp in the bottom right corner. | 17th Nov 1927 | Box 33 \ 4 Scan098 | |
| On adjustments to the magneto timing for an F.XII No. 7 engine and the resulting changes in RPM. | 26th Nov 1927 | Box 33 \ 4 Scan099 | |
| Valve timing tests and clearances for F.XI and F.XII engines. | 26th Nov 1927 | Box 33 \ 4 Scan100 | |
| Page two of a document detailing engine valve timing tests and specifications. | 26th Nov 1927 | Box 33 \ 4 Scan101 | |
| Valve timing specifications and instructions for F.XI and F.XII engines. | 26th Nov 1927 | Box 33 \ 4 Scan102 | |
| Inaccuracy of the F.XI & XLI timing device and proposing an alternative 'oil tube method' for valve timing. | 10th Dec 1927 | Box 33 \ 4 Scan103 | |
| Report page detailing the accuracy of engine timing methods and devices. | 12th Dec 1927 | Box 33 \ 4 Scan104 | |
| Valve and magneto timing specifications with a timing diagram. | 12th Dec 1927 | Box 33 \ 4 Scan105 | |
| Particulars of the valve and magneto timing for the F.12 test engine, including a timing diagram. | 21th Dec 1927 | Box 33 \ 4 Scan106 | |
| Best valve and magneto timing for the F.XII engine type test. | 21th Dec 1927 | Box 33 \ 4 Scan107 | |
| Clarifying valve timing particulars and clearances for the F.X No.14 engine. | 31th Jan 1928 | Box 33 \ 4 Scan108 | |
| Correction to the type test report for the Condor 3-A, No. 320, concerning ignition timing. | 21th Feb 1928 | Box 33 \ 4 Scan109 | |
| Amended engine timing instructions for F.11 & F.XII models due to issues with camshaft drive covers. | 1st May 1928 | Box 33 \ 4 Scan110 | |
| Instructions for timing the F.XI and XII engines. | 1st May 1928 | Box 33 \ 4 Scan111 | |
| Description of two methods for finding the top dead centre (TDC) position of an engine piston. | 3rd May 1923 | Box 33 \ 4 Scan112 | |
| Query regarding the timing arrangement for F-Type engines and the handwritten response. | 3rd May 1923 | Box 33 \ 4 Scan113 | |
| Magneto timing for RR.F.XI.B. and F.XII.B. engines with a 7/1 compression ratio. | 14th Jun 1928 | Box 33 \ 4 Scan114 | |
| Final recommendation for ignition timing on the aluminium head engine. | 14th Jun 1928 | Box 33 \ 4 Scan115 | |
| Letter to the Air Ministry regarding modification number 34 for F. Type Engines. | 20th Jul 1928 | Box 33 \ 4 Scan116 | |
| The development status of the 'H' engine, detailing requirements for the racing variant and the reliability of the service version. | 1st Aug 1928 | Box 33 \ 4 Scan117 | |
| The performance testing and proposed valve timing modifications for the 'H' engine. | 1st Aug 1928 | Box 33 \ 4 Scan118 | |
| Supercharger test, detailing performance, issues encountered, and proposed changes. | 30th Aug 1928 | Box 33 \ 4 Scan119 | |
| Valve timing specifications for RR.F. and H. supercharged engines. | 30th Aug 1928 | Box 33 \ 4 Scan120 | |
| Alteration to engine timing with two proposed camshaft designs. | 1st Aug 1928 | Box 33 \ 4 Scan121 | |
| The magneto and valve timing settings for supercharged engines. | 1st Sep 1928 | Box 33 \ 4 Scan122 | |
| Power curve comparison between a long duration camshaft and a standard camshaft for an FXI engine. | 12th Oct 1928 | Box 33 \ 4 Scan123 | |
| Faint document cover sheet with a 'Print Room' stamp. | 13th Oct 1928 | Box 33 \ 4 Scan124 | |
| Submission of Modification No. 46 regarding the timing change for F. Type engines. | 9th Nov 1928 | Box 33 \ 4 Scan125 | |
| The alteration of timing markings for 'SS' engine flywheels to accommodate a new camshaft. | 20th Nov 1928 | Box 33 \ 4 Scan126 | |
| Diagram of valve timing markings on a flywheel for an S.S. Engine. | 21th Nov 1928 | Box 33 \ 4 Scan127 | |
| Camshaft comparison tests for full and moderate supercharged engines, including valve timing data. | 3rd Jan 1929 | Box 33 \ 4 Scan128 | |
| Graph of comparative power curves for a fully supercharged engine at 10,500 feet, comparing standard and long duration camshafts. | 20th Dec 1928 | Box 33 \ 4 Scan129 | |
| Blank page with a print room date stamp in the bottom right corner. | 3rd Jan 1929 | Box 33 \ 4 Scan130 | |
| Comparative power curves at 4000' for a moderate supercharger engine, comparing standard and long duration camshafts. | 20th Dec 1928 | Box 33 \ 4 Scan131 | |
| Graph of comparative power curves at full throttle for a moderate supercharger engine, comparing standard and long duration camshafts. | 20th Dec 1928 | Box 33 \ 4 Scan132 | |
| Heavily faded typed document with a purple 'Print Room' stamp in the bottom right corner. | 3rd Jan 1929 | Box 33 \ 4 Scan133 | |
| Confirming Mr. Royce's requested change to the 20 HP inlet cam form (Sch. 1153) to improve valve gear performance. | 11th Jun 1929 | Box 33 \ 4 Scan134 | |
| Correspondence concerning valve timing and camshaft forms for the 20 HP car, referencing blueprints of valve lift curves. | 8th Jun 1929 | Box 33 \ 4 Scan135 | |
| Engine timing, power curve data, compression ratio, and clearance volume for an S.S. model. | 11th Jul 1929 | Box 33 \ 4 Scan136 | |
| Letter from the Admiralty Air Department requesting tests on electrical speed indicators for aero engines. | 20th Jun 1915 | Box 33 \ 4 Scan137 | |
| The experimentation on a magneto generator and Weston voltmeter for electrical speed indicators. | 24th Jun 1915 | Box 33 \ 4 Scan138 | |
| Generator armature reaction, voltmeter readings, and a method for diagnosing errors. | 6th Jan 1916 | Box 33 \ 4 Scan139 | |
| Unsteady readings on a Weston instrument and requesting a test with a suitable resistance. | 6th Jan 1916 | Box 33 \ 4 Scan140 | |
| Cover letter sending a copy of correspondence with the Weston Electrical Instrument Company regarding an electrical speedometer. | 6th Apr 1916 | Box 33 \ 4 Scan141 | |
| Follow-up letter to The Weston Electrical Instrument Co. regarding an overdue Weston Voltmeter for engine revolution indicators. | 7th Apr 1916 | Box 33 \ 4 Scan142 | |
| The construction of continuous current revolution indicators and experimentation with a vibrator type for the Admiralty. | 13th May 1916 | Box 33 \ 4 Scan143 | |
| Request to order a combined shunt from the Weston Electrical Instrument Company for car starter motor experiments. | 4th Dec 1916 | Box 33 \ 4 Scan144 | |
| Notification of receipt for a combined Shunt and Milli-Voltmeter available at the Stores. | 12th Dec 1916 | Box 33 \ 4 Scan145 | |
| The dispatch of electrical instruments for adjustment and standardisation. | 1st Jan 1917 | Box 33 \ 4 Scan146 | |
| Letter to the Weston Electrical Instrument Co. regarding the return of electrical testing equipment for examination. | 10th Nov 1917 | Box 33 \ 4 Scan147 | |
| Instructions to despatch a Mill-Voltmeter with shunts and volt box to the Weston Electrical Instrument Co. for adjustment. | 10th Nov 1917 | Box 33 \ 4 Scan148 | |
| Letter from Weston Electrical Instrument Company regarding the compatibility of a returned instrument with its shunts and resistance box. | 12th Nov 1917 | Box 33 \ 4 Scan149 | |
| Letter to Weston Electrical Instrument Co. requesting adjustment of a millivoltmeter set for use as a standard of reference. | 13th Nov 1917 | Box 33 \ 4 Scan150 | |
| Letter from Weston Electrical Instrument Company regarding the adjustment of shunts and external resistance to an instrument. | 15th Nov 1917 | Box 33 \ 4 Scan151 | |
| Sourcing a portable testing instrument for the Bijur Dynamo & Regulator. | 20th Jun 1918 | Box 33 \ 4 Scan152 | |
| Letter from Weston Electrical Instrument Co. detailing specifications for a Milli-voltmeter, with handwritten calculations. | 16th Mar 1918 | Box 33 \ 4 Scan153 | |
| Inquiry to The Weston Electrical Instrument Co. about the internal resistance of a milli-voltmeter. | 16th Mar 1918 | Box 33 \ 4 Scan154 | |
| From Weston Electrical Instrument Co. regarding a Model 1 Milli-Voltmeter's full scale deflection current and resistance. | 20th Mar 1918 | Box 33 \ 4 Scan155 | |
| Suggestion from Mr. Royce to use a specific Delco-Weston type ammeter for the 40/50 HP Chassis. | 6th Aug 1919 | Box 33 \ 4 Scan156 | |
| Letter from Weston Electrical Instrument Company regarding a Model 1 milli-voltmeter's specifications. | 20th Mar 1918 | Box 33 \ 4 Scan157 | |
| Requesting the purchase of a Weston combined ammeter and voltmeter for iron depositing work. | 20th Feb 1919 | Box 33 \ 4 Scan158 | |
| From Weston Electrical Instrument Co. regarding the forwarding of instrument catalogues. | 17th Mar 1919 | Box 33 \ 4 Scan159 | |
| Letter to The Weston Electrical Instrument Co. inquiring about a sample model ammeter. | 28th Mar 1919 | Box 33 \ 4 Scan160 | |
| Order for eight Weston Ammeters for specific cars and production. | 1st Apr 1919 | Box 33 \ 4 Scan161 | |
| Letter from Weston Electrical Instrument Company Ltd. providing a quote for ammeters. | 1st Apr 1919 | Box 33 \ 4 Scan162 | |
| Page two of a letter from Weston Electrical Instrument Company Ltd. regarding their models. | 28th Apr 1917 | Box 33 \ 4 Scan163 | |
| Letter from Weston Electrical Instrument Co. regarding the supply of a Model 301 ammeter. | 4th Apr 1919 | Box 33 \ 4 Scan164 | |
| Page 2 of a letter from Weston Electrical Instrument Company Ltd. regarding a battery testing instrument. | 6th Aug 1919 | Box 33 \ 4 Scan165 | |
| Receipt of an ammeter, felt washers, and clutch plates from various suppliers for experimentation. | 23th Apr 1919 | Box 33 \ 4 Scan166 | |
| Lighting installation, discussing parts from the Weston Company and experiments with a Bijur dynamo. | 25th Apr 1919 | Box 33 \ 4 Scan167 | |
| Requesting enquiries be sent out for an electrical instrument to measure condenser capacities. | 4th Jun 1919 | Box 33 \ 4 Scan168 | |
| Quotation from Weston Electrical Instrument Company for electrical measuring instruments. | 12th Jun 1919 | Box 33 \ 4 Scan169 | |
| Record of serial numbers for various Weston electrical measuring instruments and associated parts. | 30th Jun 1919 | Box 33 \ 4 Scan170 | |
| Notifying the receipt of a Weston Electric Co. model 370 Mil-ammeter for an experiment. | 2nd Jul 1919 | Box 33 \ 4 Scan171 | |
| The specific instruments required for the production testing of electrical apparatus, namely condensers and ignition coils. | 19th Aug 1919 | Box 33 \ 4 Scan172 | |
| List of instrument requirements for testing the main switch, starter motor, and dynamo. | 19th Aug 1919 | Box 33 \ 4 Scan173 | |
| The despatch of a Weston volt-ammeter for re-adjustment. | 26th Aug 1919 | Box 33 \ 4 Scan174 | |
| Letter of complaint regarding a faulty volt-ammeter and a request for its re-adjustment. | 26th Aug 1919 | Box 33 \ 4 Scan175 | |
| Request to purchase a Model 1 Weston Milli-voltmeter and various shunts to be used as a standardising set. | 2nd Sep 1919 | Box 33 \ 4 Scan176 | |
| Requesting the urgent delivery and careful handling of a Standard Weston Instrument. | 1st Oct 1919 | Box 33 \ 4 Scan177 | |
| The receipt of various electrical components and springs for experiments. | 8th Nov 1919 | Box 33 \ 4 Scan178 | |
| Sending a Weston Milli-voltmeter for repair of its needle and suspension. | 12th Nov 1919 | Box 33 \ 4 Scan179 | |
| Request to order a Weston model 163 combined ammeter and voltmeter for the Experimental Department. | 2nd Jan 1920 | Box 33 \ 4 Scan180 | |
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