Rolls-Royce Archives
From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
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DescriptionDateIdentifier
Faulty sample of a Hobbs Motor Car Heat Indicator.21th Jun 1922Box 33 \ 5  Scan030
Query comparing the specified characteristics of a generator for an aircraft engine revolution indicator with the Rolls-Royce equivalent.14th Aug 1922Box 33 \ 5  Scan031
Cover note for an enclosed leaflet describing the Gallometer by Best & Lloyd.28th Nov 1922Box 33 \ 5  Scan032
Informational leaflet explaining the operation and principle of the Gallometer for measuring fuel consumption.28th Nov 1922Box 33 \ 5  Scan033
Promotional leaflet for the 'GALLOMETER', a device for measuring a car's fuel consumption.29th Nov 1922Box 33 \ 5  Scan034
Hasler Revolution Counter being sent to stores for return to the manufacturer for repair.29th Nov 1922Box 33 \ 5  Scan035
Return of a Hasler Revolution Counter for repair.15th Feb 1923Box 33 \ 5  Scan036
Letter to the Hasler Telegraph Works requesting the prompt return of a 'Revolutions Counter' sent for repair.8th Mar 1923Box 33 \ 5  Scan037
Instruction and feature leaflet for a Hasler revolution and speed indicator tool.9th Sep 1922Box 33 \ 5  Scan038
Letter from Hasler Telegraph Works regarding a missing indicator sent for repair.9th Mar 1923Box 33 \ 5  Scan039
Quote from Hasler Telegraph Works for the repair and fitting of new parts to an indicator instrument.13th Mar 1923Box 33 \ 5  Scan040
Letter authorizing Hasler Telegraph Works to proceed with necessary repairs.14th Mar 1923Box 33 \ 5  Scan041
Letter from Hasler Telegraph Works regarding the dispatch of a repaired Speeds Indicator.21th Mar 1923Box 33 \ 5  Scan042
Requesting instructions for returning a Hasler revolution counter for repair.22th Mar 1923Box 33 \ 5  Scan043
Letter enclosing a quotation for a Cambridge Micro-indicator and accessories.16th Apr 1923Box 33 \ 5  Scan044
Quotation from The Cambridge and Paul Instrument Company, Limited for a micro-indicator and various accessories.16th Apr 1923Box 33 \ 5  Scan045
Article from 'ENGINEERING' magazine describing the Collins Micro-Indicator for high-speed engines.9th Jun 1922Box 33 \ 5  Scan046
Sales letter from German instrument manufacturer OSA Apparate-Gesellschaft promoting their dashboard instruments for motor-cars.18th Aug 1923Box 33 \ 5  Scan047
Circular letter from OSA Apparate-Gesellschaft regarding tachometers, clocks, and manometers for motor vehicles.18th Aug 1923Box 33 \ 5  Scan048
Promotional letter from OSA Apparate-Gesellschaft M.B.H. for the Optical Indicator Manograf Otto Schulze.1st Jan 1921Box 33 \ 5  Scan049
1921 French catalog for OSA brand speedometers, clocks, and tachometers for automobiles and motorcycles.1st Jan 1921Box 33 \ 5  Scan050
Price list for OSA clocks designed for motor-cars and motor-cycles.1st Jan 1921Box 33 \ 5  Scan051
Tear-off order form for an OSA Speedometer with Cardan Shaft Drive, including a diagram and vehicle specification questions.22th Nov 1923Box 33 \ 5  Scan052
The purchase of a Revolution Counter from The Hasler Telegraph Works.22th Nov 1923Box 33 \ 5  Scan053
Return of a Hasler Revolution Counter to its makers for repair.24th Nov 1923Box 33 \ 5  Scan054
Letter to Hasler Telegraph Works regarding the repair of a Hasler Revolution Counter.24th Nov 1923Box 33 \ 5  Scan055
Instruction to authorise The Hasler Telegraph Works to proceed with estimated repairs.1st Dec 1923Box 33 \ 5  Scan056
Letter from Hasler Telegraph Works confirming the dispatch of a repaired Speeds Indicator and enclosing the invoice.3rd Dec 1923Box 33 \ 5  Scan057
Despatch of a Hasler Revolution Counter for repair.16th Aug 1924Box 33 \ 5  Scan058
List of two Hasler revolution counters with their corresponding serial numbers.28th Oct 1924Box 33 \ 5  Scan059
Return of a Hasler revolution counter, No. 5596, to the makers for repair.28th Oct 1924Box 33 \ 5  Scan060
The despatch of a Revolution Counter for repair.10th Dec 1924Box 33 \ 5  Scan061
Calculations for a Speed Indicator Tester Motor, including flux, frequency, and turns per volt.5th Feb 1925Box 33 \ 5  Scan062
Requesting the return of a Hasler Revolution Counter to its makers for repair.9th Jun 1925Box 33 \ 5  Scan063
Return of a Revolution Counter for repair or replacement allowance.1st Jun 1925Box 33 \ 5  Scan064
Official order for repairs to a Hasler Revolution Counter.1st Jul 1925Box 33 \ 5  Scan065
Despatch of a Revolution Counter for repair.27th Aug 1925Box 33 \ 5  Scan066
Electrical specifications for a Weston Revs Per Minute Indicator, Model 267.13th Oct 1925Box 33 \ 5  Scan067
Test report for a Weston R.P.M. Indicator, instrument model 269.22th Oct 1925Box 33 \ 5  Scan068
Request to order one Hasler Speed Indicator for the Experimental Department due to shortages caused by frequent repairs.25th Nov 1925Box 33 \ 5  Scan069
Requesting the return of a Hasler Revolution Counter to the makers for repair.20th Nov 1925Box 33 \ 5  Scan070
Letter from the Royal Aircraft Establishment regarding the loan of an Air Speed Indicator for experimental work.5th Dec 1925Box 33 \ 5  Scan071
Loan of an Air Speed Indicator and a Pitot Head from R.A.E. Farnborough for experimental testing.9th Dec 1925Box 33 \ 5  Scan072
Receipt and return of an air speed indicator and pitot head to R.A.E., South Farnborough.29th Dec 1925Box 33 \ 5  Scan073
Technical drawing for a Driven Wheel for a Revolution Counter.1st Dec 1926Box 33 \ 5  Scan074
Technical drawing for a Driving Pinion, revision Counter.12th Jan 1926Box 33 \ 5  Scan075
Technical drawing for an Intermediate Pinion for a Reverse Counter.12th Nov 1926Box 33 \ 5  Scan076
Technical drawing of an Intermediate Wheel for a Revolution Counter.12th Jan 1926Box 33 \ 5  Scan077
Trials log for a speed indicator tester.18th Mar 1926Box 33 \ 5  Scan078
Data log sheet recording the results from trials of a speed indicator tester.18th Mar 1926Box 33 \ 5  Scan079
Log of trials for a speed indicator tester.25th Feb 1925Box 33 \ 5  Scan080
Table recording the results from trials of a speed indicator tester.17th May 1926Box 33 \ 5  Scan081
Data log of trials for a speed indicator tester, recording frequency and percentage speed variations over time.17th May 1926Box 33 \ 5  Scan082
Log of trials for a speed indicator tester, showing results from April 1926.17th May 1926Box 33 \ 5  Scan083
Log sheet detailing the results from trials of a speed indicator tester.17th May 1926Box 33 \ 5  Scan084
Log sheet detailing the results of trials conducted on a speed indicator tester.17th May 1928Box 33 \ 5  Scan085
Returning a Hasler Revolution Counter to the makers for repair.18th Jan 1926Box 33 \ 5  Scan086
Faulty Hasler revolution counter being sent for alteration.18th Mar 1926Box 33 \ 5  Scan087
Hasler Revolution Counter being sent to the stores for repair by the makers.27th Apr 1926Box 33 \ 5  Scan088
Requesting the repair of a Hasler Revolution Counter by a clock maker.17th Nov 1926Box 33 \ 5  Scan089
Returning a faulty Hasler revolution counter due to a sticking needle.6th Dec 1926Box 33 \ 5  Scan090
Report concerning a broken spring on a Revolution Circumferential and Cutting Speeds Indicator, which will be repaired free of charge.10th Dec 1926Box 33 \ 5  Scan091
Instruction to send a Hasler Revolution Counter for repair.31th Dec 1926Box 33 \ 5  Scan092
Request to return a faulty Hasler revolution counter for re-adjustment and repair.14th May 1927Box 33 \ 5  Scan093
Instructing Stores to despatch a faulty Hasler revolution counter for repair.17th May 1927Box 33 \ 5  Scan094
Requesting a Hasler Rev. Counter No. 5596 be returned to its makers for repair.27th Jun 1927Box 33 \ 5  Scan095
Improved electrical indicator valve, its use, maintenance, and supply of parts.17th Jan 1928Box 33 \ 5  Scan096
Blueprint for an improved electrical indicator valve with component details and dimensions.17th Jan 1928Box 33 \ 5  Scan097
Instruction to send a Hasler Revolution Counter for repair and return.27th Jun 1928Box 33 \ 5  Scan098
Electrical testing specifications and calculations for a speed indicator tester.14th Aug 1928Box 33 \ 5  Scan099
Optimal position of a sparking plug in an engine cylinder.18th Jul 1916Box 33 \ 5  Scan100
The testing of different sparking plug positions on the 'Hawk' engine.27th Jun 1916Box 33 \ 5  Scan101
Note on observing a pre-igniting plug inside a cylinder.9th Sep 1916Box 33 \ 5  Scan102
Spark plug overheating, detailing Mr. Royce's suggestion to use water-cooled copper pipes.9th Sep 1916Box 33 \ 5  Scan103
Trial and development of a new 6-volt coil compared to the standard 4-volt version.31th Oct 1913Box 34 \ 1  Scan001
Query regarding the winding particulars for a 6-volt ignition coil and the number of plates in the condenser.24th Mar 1914Box 34 \ 1  Scan002
The necessity of a condenser folding machine for the standardisation of 6-volt coils.21th Apr 1914Box 34 \ 1  Scan003
Confirming a conversation about purchasing a condenser folding machine instead of building one, to aid in standardising the 6 volt coil.28th May 1914Box 34 \ 1  Scan004
Two designs for a modified single spark coil to produce a single spark instead of a series.28th May 1914Box 34 \ 1  Scan005
Providing specifications for a standard chassis coil in response to a query.1st Sep 1915Box 34 \ 1  Scan006
Modifications to the battery ignition system for cars equipped with a self-starter.10th Jul 1917Box 34 \ 1  Scan007
Positioning and capacity of ignition condensers and the future adoption of electric starters.10th Jul 1917Box 34 \ 1  Scan008
The cost and performance benefits of synchronised battery and magneto ignitions over trembler ignitions.10th Jul 1917Box 34 \ 1  Scan009
Extract discussing the placement and use of condensers in trembler ignition systems to reduce the burning of platinum points.14th Aug 1919Box 34 \ 1  Scan010
From 'R.' to 'Mr. Ellis' with instructions for converting and testing a battery ignition system.27th Aug 1917Box 34 \ 1  Scan011
Conversion of a battery ignition system to a non-trembler type for engine 7-CA.27th Aug 1917Box 34 \ 1  Scan012
Letter to Commander Bristow regarding the development and improvement of a battery ignition system for aero engines.5th Sep 1917Box 34 \ 1  Scan013
Calculation of the capacity of a condenser.28th Dec 1917Box 34 \ 1  Scan014
The calculation of inductance of a coil.28th Dec 1917Box 34 \ 1  Scan015
Requesting a modified trembler coil for a battery ignition system, including a hand-drawn diagram.12th Mar 1918Box 34 \ 1  Scan016
Specifications and volume requirements for a battery ignition condenser for a 12-volt coil.20th Apr 1918Box 34 \ 1  Scan017
Suitability and testing of a 12-volt battery ignition system.20th Apr 1918Box 34 \ 1  Scan018
Table of approximate capacitance values in microfarads for various experimental condensers.5th Jul 1918Box 34 \ 1  Scan019
Condenser capacity issues related to battery ignition systems.5th Jun 1918Box 34 \ 1  Scan020
Investigating disappointing test results on platinum points due to an under-capacity condenser for the battery ignition.18th Jun 1918Box 34 \ 1  Scan021
Condenser capacity tests to quench sparks on platinum points and plans for future long-run tests.18th Jun 1918Box 34 \ 1  Scan022
Modifying a pocket voltmeter to improve the measurement of condenser capacities.2nd Jul 1918Box 34 \ 1  Scan023
Report discussing the fitment of Truffault shock absorbers, starter motors, and battery ignition systems for the 7-CA chassis model.5th Jan 1919Box 34 \ 1  Scan024
Ignition gear modifications, condensers, and issues with trembler coils.26th Apr 1917Box 34 \ 1  Scan025
Continued note regarding modifications to coils and condensers for existing cars.25th Apr 1917Box 34 \ 1  Scan026


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