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
Liability and charges for modifications to the 25/30 Zenith Carburetter.19th Jul 1938Box 122 \ 3  scan0049
Recurring problems and modifications for 25/30 HP Zenith carburetters.20th Jul 1938Box 122 \ 3  scan0050
Page two of a memo regarding customer complaints about being charged directly by Zenith.22th Jul 1938Box 122 \ 3  scan0051
From 'Rm' about an attached letter to Turner concerning cost sharing.22th Jul 1938Box 122 \ 3  scan0052
Letter to the Zenith Carburetter Co. regarding a customer complaint and the cost of rectifying a faulty carburetter.22th Jul 1938Box 122 \ 3  scan0053
Letter from Zenith Carburetter Co. Ltd discussing servicing charges for their carburetters.23th Jul 1938Box 122 \ 3  scan0054
The second page of a letter to W. A. Robotham regarding a Credit Note.23th Jul 1938Box 122 \ 3  scan0055
Letter from Zenith Carburetter Co. Ltd. regarding charges for carburetter modifications.25th Jul 1938Box 122 \ 3  scan0056
Letter from Zenith Carburetter Co. to W. A. Robotham proposing to split the cost of modifications fifty-fifty.25th Jul 1938Box 122 \ 3  scan0057
Letter from Zenith Carburetter Co. Ltd regarding an altered DC.42 carburetter to fix a sticking strangler flap.28th Jul 1938Box 122 \ 3  scan0058
Letter to The Zenith Carburetter Co. Ltd. accepting their offer to bear 50% of the costs for modifying carburetters.28th Jul 1938Box 122 \ 3  scan0059
Service costs for Zenith carburetter modifications and an agreement to share the expense.28th Jul 1938Box 122 \ 3  scan0060
Letter from Zenith Carburetter Co Ltd regarding the availability and pricing of American carburetters for the Phantom III.2nd Aug 1938Box 122 \ 3  scan0061
Letter from Zenith Carburetter Co. regarding the supply, pricing, and modification of AAV-2 carburettors for the Phantom III.2nd Aug 1938Box 122 \ 3  scan0062
Letter from Zenith Carburetter Co. discussing carburetter options and costs for different engine models, including the Phantom III.2nd Aug 1938Box 122 \ 3  scan0063
Letter to Zenith Carburetter Co. requesting information regarding induction pipes for use with duplex carburetters on six-cylinder engines.4th Aug 1938Box 122 \ 3  scan0064
Letter to Zenith Carburetter Co. Ltd. regarding the supply and testing of a carburetter on a Phantom III.4th Aug 1938Box 122 \ 3  scan0065
Letter to Zenith Carburetter Co. Ltd. regarding a failed D.C.42 float sent for inspection.5th Aug 1938Box 122 \ 3  scan0066
Letter from Zenith Carburetter Co. regarding carburetter tests and the design of a new single barrel model.5th Aug 1938Box 122 \ 3  scan0067
Letter to Zenith Carburetter Co. Ltd. regarding maximum air flow figures for the AAV-2 carburetter and a new single barrel design.6th Aug 1938Box 122 \ 3  scan0068
Letter from Zenith Carburetter Co. acknowledging an enquiry about twin carburetters for 6 Cyl. engines.6th Aug 1938Box 122 \ 3  scan0069
Letter from Zenith Carburetter Co Ltd regarding comparative airflow tests on carburetter components for the Phantom III engine.9th Aug 1938Box 122 \ 3  scan0070
The second page of a letter from The Zenith Carburetter Co. Limited to W. A. Robotham.9th Aug 1938Box 122 \ 3  scan0071
Letter from The Zenith Carburetter Co. Ltd. discussing the performance of twin versus single carburetters on 6-cylinder engines.11th Aug 1938Box 122 \ 3  scan0072
Page 2 of a letter from The Zenith Carburetter Co. to W. A. Robotham requesting drawings for suggested modifications.11th Aug 1938Box 122 \ 3  scan0073
Full bore flooding tests of a Stromberg DC.42 carburetter.16th Aug 1938Box 122 \ 3  scan0074
Comparison of fuel flow rates for the 25/30 and Wraith models under level and gradient conditions.10th Aug 1938Box 122 \ 3  scan0075
Fuel flow and flooding tests on gradients for 25/30 and Wraith cars.16th Aug 1938Box 122 \ 3  scan0076
Letter from Zenith Carburetter Co. Ltd regarding fitting a thick strangler flap with a poppet valve to a DC-42 carburetter.18th Aug 1938Box 122 \ 3  scan0077
Letter to Zenith Carburetter Co., Ltd. confirming an order for a DG-42 carburetter with a thick strangler flap.19th Aug 1938Box 122 \ 3  scan0078
Letter to The Zenith Carburetter Co. Ltd. regarding the despatch of two E.E.C.42 carburetters.30th Aug 1938Box 122 \ 3  scan0079
Letter from Zenith Carburetter Co. following up on the dispatch of two EEC-42 carburetters which have not yet arrived.7th Sep 1938Box 122 \ 3  scan0080
Letter to The Zenith Carburetter Co. Ltd. apologising for a delay in dispatching two E.E.C.42 carburetters.9th Sep 1938Box 122 \ 3  scan0081
Despatching two E.E.C.42 carburettors to the Zenith Carburetter Co. Ltd. for overhaul.9th Sep 1938Box 122 \ 3  scan0082
Letter from Zenith Carburetter Co. Ltd regarding Hotchkiss pipe details and carburetter manufacturing.20th Sep 1938Box 122 \ 3  scan0083
Letter from Zenith Carburetter Co. Ltd. chasing instructions for carburetters sent for inspection.22th Sep 1938Box 122 \ 3  scan0084
Letter to The Zenith Carburetter Co. regarding the retention of 4 carburetters until the price is settled.29th Sep 1938Box 122 \ 3  scan0085
Letter to Zenith Carburetter Co. Ltd. concerning the return and request of carburetter samples for testing.30th Sep 1938Box 122 \ 3  scan0086
Letter discussing an amended quotation and the delivery of two skeleton carburetters.30th Sep 1938Box 122 \ 3  scan0087
Letter from Zenith Carburetter Co. regarding carburetters on Sale or Return and annual stocktaking.1st Oct 1938Box 122 \ 3  scan0088
Letter from Zenith Carburetter Co Ltd regarding the return of experimental carburettors and sending replacements.3rd Oct 1938Box 122 \ 3  scan0089
Letter from The Zenith Carburetter Co. Limited, page 2.3rd Oct 1938Box 122 \ 3  scan0090
Value for money of Stromberg carburetters.4th Oct 1938Box 122 \ 3  scan0091
Supply, finish, and pricing of Stromberg carburettors (Type D.C.42).4th Oct 1938Box 122 \ 3  scan0092
List of required modifications and points to be included in a new drawing for a carburettor system.4th Oct 1938Box 122 \ 3  scan0093
Testing different finishes and automatic starting mechanisms for Zenith carburetters.4th Oct 1938Box 122 \ 3  scan0094
Engine warm start behavior and the finalization of carburettor specifications.4th Oct 1938Box 122 \ 3  scan0095
Photographic comparison of four different carburetor models with identifying labels.10th Oct 1938Box 122 \ 3  scan0096
Request to send an order to The Zenith Carburetter Co. Ltd. for a Stromberg carburetter.10th Oct 1938Box 122 \ 3  scan0097
Letter to the Zenith Carburetter Co. Ltd. regarding a misunderstanding over sample carburetters and placing an order for two skeleton models.10th Oct 1938Box 122 \ 3  scan0098
Letter from Zenith Carburetter Co. Ltd regarding a specially modified DBV-42 throttle body.17th Oct 1938Box 122 \ 3  scan0099
Letter from Zenith Carburetter Co. Ltd providing data on carburetter air flow and depression for two models.20th Oct 1938Box 122 \ 3  scan0100
Cover letter from The Zenith Carburetter Co. Ltd.20th Oct 1938Box 122 \ 3  scan0101
Diagram of a 6-cylinder engine exhaust manifold, highlighting the 'Hot Spot'.1st Oct 1938Box 122 \ 3  scan0102
Translated letter from Société du Carburateur Zénith to The Zenith Carburetter Co. Ltd. discussing exhaust systems and inlet pipe heating.27th Oct 1938Box 122 \ 3  scan0103
Letter from The Zenith Carburetter Co Ltd regarding the posting of drawings received from France.1st Nov 1938Box 122 \ 3  scan0104
Letter from The Zenith Carburetter Co. Ltd requesting an official order for a DBV-42 carburetter throttle body.1st Nov 1938Box 122 \ 3  scan0105
Request to issue an order to Zenith Carburetter Co. Ltd. for two skeleton carburetters already received.12th Nov 1938Box 122 \ 3  scan0106
Preliminary tests and proposed modifications for a dual Stromberg carburetter on a Wraith engine.13th Dec 1938Box 122 \ 3  scan0107
Letter from The Zenith Carburetter Co. Ltd. with New Year's wishes to Mr. Robotham.30th Dec 1938Box 122 \ 3  scan0108
Letter to Zenith Carburetter Co. Ltd. requesting parts and ordering new carburettors for testing.17th Jan 1939Box 122 \ 3  scan0109
Request to place an order for two carburetters and throttle bodies with The Zenith Carburetter Co. Ltd.18th Jan 1939Box 122 \ 3  scan0110
Letter to Zenith Carburetter Co. Ltd. regarding undersized needle seatings on A.A.25 carburettors.27th Jan 1939Box 122 \ 3  scan0111
Letter to Zenith Carburetter Co. Ltd. requesting larger chokes and corresponding jets for a DC.42 Stromberg carburetter.8th Feb 1939Box 122 \ 3  scan0112
Order to be placed with Zenith Carburetter Co. Ltd. for chokes.8th Feb 1939Box 122 \ 3  scan0113
Letter to Zenith Carburetter Co. Ltd. regarding the modification of 6 experimental Wraith carburetters.10th Mar 1939Box 122 \ 3  scan0114
Letter from Zenith Carburetter Co Ltd recommending the supply of new carburettors instead of modifying old, obsolete ones for the Wraith specification.22th Mar 1939Box 122 \ 3  scan0115
Order for new carburettors as the existing ones sent for modification are now considered obsolete.24th Mar 1939Box 122 \ 3  scan0116
Letter to Zenith Carburetter Co. Ltd. agreeing to purchase six new carburetters instead of modifying obsolete ones.24th Mar 1939Box 122 \ 3  scan0117
Letter chasing an order for carburetters and associated parts from The Zenith Carburetter Co. Ltd.27th Mar 1939Box 122 \ 3  scan0118
Letter from the Experimental Dept. to Zenith Carburetter Co. requesting a further pair of variable jets.29th Mar 1939Box 122 \ 3  scan0119
Request to send an order to The Zenith Carburetter Co. Ltd. for two variable jet controls for use on Stromberg type AA.25 carburettors.29th Mar 1939Box 122 \ 3  scan0120
Letter to the Zenith Carburetter Co. Ltd. regarding a complaint about a sticking choke valve on a Wraith carburetter.3rd Apr 1939Box 122 \ 3  scan0121
Letter confirming the dispatch of two needle valves for an AA-25 carburetter.4th Apr 1939Box 122 \ 3  scan0122
Letter from The Zenith Carburetter Co. Ltd. confirming two carburetters have been sent for examination.4th Apr 1939Box 122 \ 3  scan0123
Letter from The Zenith Carburetter Co Ltd responding to a complaint about a sticking choke valve on a Wraith carburetter.5th Apr 1939Box 122 \ 3  scan0124
Letter to Zenith Carburetter Co. Ltd. requesting a complete specification for two AA.25 carburetters.13th Apr 1939Box 122 \ 3  scan0125
Order be sent to The Zenith Carburetter Co. Ltd. for parts for Buick and Cadillac vehicles.13th Apr 1939Box 122 \ 3  scan0126
Letter from Zenith Carburetter Co. Ltd confirming an order for two AAV-26 carburettors.1st May 1939Box 122 \ 3  scan0127
Letter from the Experimental Department to The Zenith Carburetter Co. Ltd. requesting drawings for a Stromberg carburetter.4th May 1939Box 122 \ 3  scan0128
Letter from Zenith Carburetter Co. Ltd seeking clarification on an order for six new carburetters.6th May 1939Box 122 \ 3  scan0129
Letter to The Zenith Carburetter Co. Ltd. regarding a request for 6 new carburettors.11th May 1939Box 122 \ 3  scan0130
Letter to Zenith Carburetter Co. Ltd. confirming a request for two single Wraith carburetters for testing.12th Jun 1939Box 122 \ 3  scan0131
Request for an official order for two Wraith type carburetters.12th Jun 1939Box 122 \ 3  scan0132
Request to order Stromberg carburetters and associated parts from The Zenith Carburetter Co. Ltd.21th Jun 1939Box 122 \ 3  scan0133
Request for the supply of carburettors and various jets to Zenith Carburetter Co. Ltd.21th Jun 1939Box 122 \ 3  scan0134
Letter to Zenith Carburetter Co. Ltd. regarding fuel starvation issues and required modifications for AA.25 carburetters.22th Jun 1939Box 122 \ 3  scan0135
Request for prints of Stromberg AA.25 carburetter parts from the Experimental Department.6th Jul 1939Box 122 \ 3  scan0136
Letter from Zenith Carburetter Co. Ltd regarding a delay in supplying requested drawing prints.7th Jul 1939Box 122 \ 3  scan0137
Letter from Zenith Carburetter Co. Ltd regarding the supply of drawing prints.14th Jul 1939Box 122 \ 3  scan0138
Letter from Zenith Carburetter Co Ltd regarding tests on needle seatings for A.A.25 Carburetters.18th Jul 1939Box 122 \ 3  scan0139
Letter from Zenith Carburetter Co. about carburetter needle seating and pump pressure.18th Jul 1939Box 122 \ 3  scan0140
Letter to Zenith Carburetter Co. Ltd. discussing issues with the A.A.25 carburetter.20th Jul 1939Box 122 \ 3  scan0141
Calculation memo detailing pressure and load forces on different diameter carburetter needle seats.20th Jul 1939Box 122 \ 3  scan0142
Letter to The Zenith Carburetter Co. arranging a meeting to discuss the Duplex Carburetter.20th Jul 1939Box 122 \ 3  scan0143
Letter from The Zenith Carburetter Co Ltd concerning the practicalities of needle seat finishing.21th Jul 1939Box 122 \ 3  scan0144
Page 2 of a letter from Zenith Carburetter Co. regarding needle seating dimensions.21th Jul 1939Box 122 \ 3  scan0145
Letter to Zenith Carburetter Co. Ltd. regarding the setup of an AA.25 carburetter on a six-cylinder engine.22th Jul 1939Box 122 \ 3  scan0146
Querying an invoice from Zenith Carburetter Co. Ltd. regarding a discrepancy in an order for carburetter jets.22th Jul 1939Box 122 \ 3  scan0147
Letter from Zenith Carburetter Co. Ltd. regarding an invoice for Metering and By-pass Jets.20th Jul 1939Box 122 \ 3  scan0148
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