| Description | Date | Identifier | |
| Letter to The General Electric Co. Ltd. inquiring about a rotary three-way switch for a motor car instrument board. | 13th Feb 1940 | Box 137 \ 3 scan0177 | |
| Letter from M.K. Electric Ltd. responding to an inquiry about a 3-way rotary switch and enclosing a catalogue. | 15th Feb 1940 | Box 137 \ 3 scan0178 | |
| Letter from S. Smith & Sons regarding the design and supply of heaters, a thermostatic pressure relief valve, and air conditioners. | 15th Feb 1940 | Box 137 \ 3 scan0179 | |
| Letter from General Electric Co Ltd declining to supply a 3-way Rotary Switch. | 16th Feb 1940 | Box 137 \ 3 scan0180 | |
| From Rm to Ev regarding detailing the scheme for the vacuum hand control. | 16th Feb 1940 | Box 137 \ 3 scan0181 | |
| Letter from J. A. Crabtree & Co Ltd declining an enquiry for 3-way Rotary type Switches. | 17th Feb 1940 | Box 137 \ 3 scan0182 | |
| Official order for two Smith Air Conditioning units. | 17th Feb 1940 | Box 137 \ 3 scan0183 | |
| Letter from M.C.L. and Repetition Ltd. responding to an enquiry for a small three-way switch. | 19th Feb 1940 | Box 137 \ 3 scan0184 | |
| Continuation sheet from a supplier with queries regarding instrument panel switch specifications. | 19th Feb 1940 | Box 137 \ 3 scan0185 | |
| Request to manufacture one modified car heater casing and baffle based on specific sketches. | 19th Feb 1940 | Box 137 \ 3 scan0186 | |
| Letter to John Marston Ltd. concerning modifications to a Silver Dawn radiator, prints for a Ripple radiator shell, and a modified heater. | 19th Feb 1940 | Box 137 \ 3 scan0187 | |
| Letter discussing investigations into heater noise and requesting two Mark III blocks for testing. | 19th Feb 1940 | Box 137 \ 3 scan0188 | |
| Letter from a supplier declining to provide a quotation for an adaptable switch. | 20th Feb 1940 | Box 137 \ 3 scan0189 | |
| Letter from Ferranti Ltd. regarding an enquiry for rotary switches and enclosing a product list. | 20th Feb 1940 | Box 137 \ 3 scan0190 | |
| Letter from TOK SWITCHES LIMITED responding to a query about their switches and enclosing a catalogue. | 21th Feb 1940 | Box 137 \ 3 scan0191 | |
| Letter discussing the design, specifications, and testing of a multi-position switch with a supplier. | 23th Feb 1940 | Box 137 \ 3 scan0192 | |
| Letter continuation specifying current and quantity requirements, requesting a sample switch and a cost figure. | 23th Feb 1940 | Box 137 \ 3 scan0193 | |
| Letter to Tok Switches Ltd. regarding the unsuitability of their catalogue switches for a motor car. | 23th Feb 1940 | Box 137 \ 3 scan0194 | |
| Request to place an official order with Messrs. Ferranti Ltd. for two heater switches. | 26th Feb 1940 | Box 137 \ 3 scan0195 | |
| Letter to Ferranti Ltd. requesting samples of switches from their catalogue. | 26th Feb 1940 | Box 137 \ 3 scan0196 | |
| Letter from a supplier regarding the feasibility of producing a custom small rotary switch. | 27th Feb 1940 | Box 137 \ 3 scan0197 | |
| Continuation sheet from M.C.L. and Repetition Ltd stating an inability to fulfil requirements. | 27th Feb 1940 | Box 137 \ 3 scan0198 | |
| Internal request to order two car heaters from Messrs. S. Smith & Sons. | 28th Feb 1940 | Box 137 \ 3 scan0199 | |
| Letter to S. Smith & Sons Ltd requesting two additional heater units or 'fug-stirrers'. | 28th Feb 1940 | Box 137 \ 3 scan0200 | |
| Letter from S. Smith & Sons (Motor Accessories) Ltd confirming the dispatch of Smith Heaters and accessories. | 1st Mar 1940 | Box 137 \ 3 scan0201 | |
| To place an official order for two car heaters to Messrs. Hallam, Sleigh & Cheston. | 1st Mar 1940 | Box 137 \ 3 scan0202 | |
| Letter to Messrs. Hallam, Sleigh & Cheston Ltd. requesting two water circulation car heaters for testing. | 1st Mar 1940 | Box 137 \ 3 scan0203 | |
| Letter to M.C.L. & Repetition Ltd. regarding their inability to supply required parts from their production stock. | 1st Mar 1940 | Box 137 \ 3 scan0204 | |
| Letter discussing a drawing for a car heater, comparing thermo-syphon cooling with pressure circulation, and requesting heaters for testing. | 3rd Mar 1940 | Box 137 \ 3 scan0205 | |
| Letter from Hallam, Sleigh & Cheston regarding the supply and installation of car heaters, suggesting a special steam unit. | 4th Mar 1940 | Box 137 \ 3 scan0206 | |
| Letter from Klaxon Limited regarding the supply of motors for heater units. | 5th Mar 1940 | Box 137 \ 3 scan0207 | |
| Investigation report on the failure of a Lucas Heater Motor due to overheating. | 7th Mar 1940 | Box 137 \ 3 scan0208 | |
| Letter to Klaxons Ltd. regarding testing their motor and a potential order. | 9th Mar 1940 | Box 137 \ 3 scan0209 | |
| Letter to Klaxons Ltd. regarding the testing of their motor and a potential order for 500 units. | 9th Mar 1940 | Box 137 \ 3 scan0210 | |
| Letter from Hallam, Sleigh & Cheston regarding the receipt of an air heater for testing and a delay in delivering two water electric heaters. | 20th Mar 1940 | Box 137 \ 3 scan0211 | |
| Ordering existing List of Parts for the Senior Gearbox to be used on the Ripplet Chassis. | 28th Mar 1940 | Box 137 \ 3 scan0212 | |
| Letter to Messrs. Klaxons Ltd. chasing the delivery of a motor for testing. | 29th Mar 1940 | Box 137 \ 3 scan0213 | |
| Preliminary investigation into fitting a Cotal Gearbox to the 4-cylinder Rippletto engine. | 29th Mar 1940 | Box 137 \ 3 scan0214 | |
| Requesting the rebuild of a 20 M Kg Cotal Gearbox that is being returned to Wolseley's. | 1st Apr 1940 | Box 137 \ 3 scan0215 | |
| Letter from Hallam, Sleigh & Cheston regarding the supply of car heaters and demisters. | 1st Apr 1940 | Box 137 \ 3 scan0216 | |
| Letter from Klaxon Limited regarding a delay in dispatching a sample Unit Heater Motor due to waiting for different brushes. | 3rd Apr 1940 | Box 137 \ 3 scan0217 | |
| Letter to Hallam Sleigh & Cheston Ltd. regarding the return of an unsuitable 'Klampon' heater. | 4th Apr 1940 | Box 137 \ 3 scan0218 | |
| The return of a loaned heater to Hallam, Sleigh & Cheston Ltd. | 6th Apr 1940 | Box 137 \ 3 scan0219 | |
| Requesting de-frosting parts for a Phantom III chassis, No. 3-DH-5, intended for exhibition at the New York World's Fair. | 8th Apr 1940 | Box 137 \ 3 scan0220 | |
| Follow-up letter to Klaxons Ltd. urgently requesting the delivery of an electric motor for heater parts. | 10th Apr 1940 | Box 137 \ 3 scan0221 | |
| Requesting the dispatch of parts for the Worlds Fair Chassis to Messrs. Park Ward Ltd. | 11th Apr 1940 | Box 137 \ 3 scan0222 | |
| Letter to Clayton Dewandre Ltd. chasing up test results for four car heaters. | 16th Apr 1940 | Box 137 \ 3 scan0223 | |
| Letter from Dunlop Rubber Co. Ltd. confirming the despatch and price of two lengths of hose. | 15th Apr 1940 | Box 137 \ 3 scan0224 | |
| Letter from Clayton Dewandre Company Ltd. regarding the testing status of various supplied car heaters. | 15th Apr 1940 | Box 137 \ 3 scan0225 | |
| Letter from Clayton Dewandre Co. Ltd. regarding the testing of car heaters. | 18th Apr 1940 | Box 137 \ 3 scan0226 | |
| Requesting an official order for car heater parts from Klaxons Ltd. and Dunlop Rubber Co. Ltd. | 18th Apr 1940 | Box 137 \ 3 scan0227 | |
| Instruction to receive blueprints for a new joint selector bearing for the Senior Range gearbox. | 24th Apr 1940 | Box 137 \ 3 scan0228 | |
| Advice note regarding the receipt of two heaters. | 29th Apr 1940 | Box 137 \ 3 scan0229 | |
| The supply of 'Fish Tails' and other parts for the World's Fair Chassis. | 30th Apr 1940 | Box 137 \ 3 scan0230 | |
| Despatch of two 'Fish Tails' to Messrs. Park Ward & Co. Ltd and a follow-up query. | 25th Apr 1940 | Box 137 \ 3 scan0231 | |
| Letter to Klaxons Ltd. regarding the supply and modification of an N.Z. electric motor. | 2nd May 1940 | Box 137 \ 3 scan0232 | |
| Letter to Clayton Dewandre Ltd. regarding an overloaded motor on a Marston R-R heater. | 2nd May 1940 | Box 137 \ 3 scan0233 | |
| Confirming the dispatch of heater and defroster parts for the New York World's Fair Car. | 2nd May 1940 | Box 137 \ 3 scan0234 | |
| Requesting an update on the dispatch of outstanding De Froster parts for the New York World's Fair Car. | 30th Apr 1940 | Box 137 \ 3 scan0235 | |
| The return of advice notes for heaters and a related order for various matrix blocks. | 2nd May 1940 | Box 137 \ 3 scan0236 | |
| The modification of an existing car heater case. | 3rd May 1940 | Box 137 \ 3 scan0237 | |
| Letter to Messrs. Klaxons Ltd. regarding the trial of a fan with a resistance incorporated into an NZ motor. | 6th May 1940 | Box 137 \ 3 scan0238 | |
| Letter from Klaxon Ltd. regarding an N.Z. Electric Motor and requesting a sample Fan Runner for modification. | 4th May 1940 | Box 137 \ 3 scan0239 | |
| The implementation of a vacuum-assisted column gear change for the Senior Range, seeking information on its effect on engine idling. | 30th Apr 1940 | Box 137 \ 3 scan0240 | |
| Letter from S. Smith & Sons following up on a discussion regarding Panels and Heaters. | 24th Jun 1940 | Box 137 \ 3 scan0241 | |
| Letter from S. Smith & Sons acknowledging receipt of a letter, stating it will be passed to Mr. Nichols upon his return. | 5th Jul 1940 | Box 137 \ 3 scan0242 | |
| Letter to S. Smith & Sons Ltd. regarding comments on a supplied heater. | 7th Jul 1940 | Box 137 \ 3 scan0243 | |
| Outlining issues and potential improvements for a Smith's car heater. | 8th Jul 1940 | Box 137 \ 3 scan0244 | |
| Letter from S. Smith & Sons acknowledging receipt of criticism on a heater. | 9th Jul 1940 | Box 137 \ 3 scan0245 | |
| Requesting the transfer of a heater to create a general arrangement drawing. | 25th Sep 1940 | Box 137 \ 3 scan0246 | |
| Confirming the programme for fitting heaters to specific chassis. | 25th Sep 1940 | Box 137 \ 3 scan0247 | |
| Requesting investigation into an invoice from J. Marston Ltd for a verbally ordered car heater. | 25th Sep 1940 | Box 137 \ 3 scan0248 | |
| Letter from John Marston Ltd. regarding a dispute over an invoice for a car heater conversion, stating it was based on verbal instructions. | 13th Sep 1940 | Box 137 \ 3 scan0249 | |
| Letter to S. Smith & Sons Ltd. regarding the testing and performance of their 'Hades' car heater. | 26th Sep 1940 | Box 137 \ 3 scan0250 | |
| Letter to C.W. Nicholls of Messrs S. Smith & Sons Ltd. chasing the delivery of heaters. | 29th Oct 1940 | Box 137 \ 3 scan0251 | |
| Letter from a supplier about a delay in sending heaters due to awaiting specifications for defroster units. | 1st Nov 1940 | Box 137 \ 3 scan0252 | |
| Letter from S. Smith & Sons (Motor Accessories) Ltd. to W. A. Robotham concerning the installation of heaters. | 18th Nov 1940 | Box 137 \ 3 scan0253 | |
| Tests comparing the efficacy of the Hadees heater with an R.H. shield against the A.C. heater. | 5th Feb 1941 | Box 137 \ 3 scan0254 | |
| Letter to S. Smith & Sons requesting the supply of defroster hose for a 'Hadies' heater. | 31th Dec 1940 | Box 137 \ 3 scan0255 | |
| Letter from S. Smith & Sons regarding noise issues with sample heaters and recommendations for alternative heating systems. | 24th Jan 1941 | Box 137 \ 3 scan0256 | |
| Letter discussing an underseat heater's performance and requesting to borrow an American version for testing in limousines. | 30th Jan 1941 | Box 137 \ 3 scan0257 | |
| Comparing the performance of the Hadees heater with a shield against the A.C. heater. | 3rd Feb 1941 | Box 137 \ 3 scan0258 | |
| Graph comparing the temperature rise of different car heaters over time on model 1-R-1. | 3rd Feb 1941 | Box 137 \ 3 scan0259 | |
| Graph comparing the performance of four different car heaters over time. | 3rd Feb 1938 | Box 137 \ 3 scan0260 | |
| Letter from S. Smith & Sons acknowledging receipt of correspondence regarding a Heater matter. | 4th Feb 1941 | Box 137 \ 3 scan0261 | |
| Letter to Messrs S. SMITH & Sons, Ltd. acknowledging the safe receipt of an underseat heater. | 20th Feb 1941 | Box 137 \ 3 scan0262 | |
| Letter to C.W. Nichols of S. Smith & Sons (M.A) Ltd. requesting an underseat heater. | 8th Feb 1941 | Box 137 \ 3 scan0263 | |
| Letter from S. Smith & Sons to W.A. Robotham regarding a sample heater and an improved blower design. | 6th Feb 1941 | Box 137 \ 3 scan0264 | |
| Letter from S. Smith & Sons confirming an Underseat Heater is being posted. | 13th Feb 1941 | Box 137 \ 3 scan0265 | |
| Cover letter from S. Smith & Sons regarding the despatch of an American type underseat heater. | 14th Feb 1941 | Box 137 \ 3 scan0266 | |
| Letter to S. Smith & Sons discussing the performance of underseat heaters and the development of defroster systems for Bentley V's. | 14th Feb 1941 | Box 137 \ 3 scan0267 | |
| Letter from S. Smith & Sons regarding the development and supply of a new car heater and defroster system. | 10th Feb 1941 | Box 137 \ 3 scan0268 | |
| Letter from S. Smith & Sons concerning the performance of a heater and windscreen defroster unit. | 17th Feb 1941 | Box 137 \ 3 scan0269 | |
| Letter concerning an under-seat heater motor received with the incorrect voltage (6-volt instead of 12-volt). | 24th Feb 1941 | Box 137 \ 3 scan0270 | |
| Letter from S. Smith & Sons regarding an underseat heater and motor compatibility. | 25th Feb 1941 | Box 137 \ 3 scan0271 | |
| Confirming an investigation into the possibility of fitting an under-seat heater. | 25th Feb 1944 | Box 137 \ 3 scan0272 | |
| Letter to Major B.C. Carter detailing the method for correcting tests on a complete shaft to determine single crank stiffness. | 29th Mar 1929 | Box 137 \ 4 scan0001 | |
| Comparison of observed and calculated critical speeds for various engines using different calculation methods. | 8th Apr 1929 | Box 137 \ 4 scan0002 | |
| Table comparing crankshaft dimensions, twist, and stiffness for various engine models. | 8th Apr 1929 | Box 137 \ 4 scan0003 | |
| Table comparing calculated and observed critical speeds for various engines. | 28th Feb 1928 | Box 137 \ 4 scan0004 | |
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