| Description | Date | Identifier | |
| Letter from Cadillac Motor Car Company providing a list of parts for a hydraulic lash adjuster. | 19th Mar 1934 | Box 173 \ 3 img110 | |
| Continued list of part numbers and their corresponding names, addressed to Mr. W. A. Robotham. | 19th Mar 1934 | Box 173 \ 3 img111 | |
| Concluding page of a letter to Mr. W. A. Robotham listing various part numbers and names. | 7th Apr 1934 | Box 173 \ 3 img112 | |
| Letter to E. W. Seaholm of Cadillac Motor Car Company congratulating them on their independent wheel springing development. | 7th Apr 1934 | Box 173 \ 3 img113 | |
| Letter concerning the shipment of a Graham Paige car aboard the American Farmer ship from Detroit to London. | 31th Mar 1934 | Box 173 \ 3 img114 | |
| Letter concerning a Graham Paige and inquiring about the shipping date for a Cadillac. | 7th Apr 1934 | Box 173 \ 3 img115 | |
| The policy for running and selling Bentley cars in the United States market. | 7th Apr 1934 | Box 173 \ 3 img116 | |
| Requesting a list of suggested modifications for the Bentley Car for export to the U.S.A. | 28th Mar 1934 | Box 173 \ 3 img117 | |
| Letter enclosing remarks on the running of a Bentley in the United States. | 9th Apr 1934 | Box 173 \ 3 img118 | |
| Letter to the Aluminium Co. of America requesting the procurement of Perfect Circle piston rings for testing. | 9th Apr 1934 | Box 173 \ 3 img119 | |
| Request for particulars of flying during a visit to America for insurance purposes. | 11th Apr 1934 | Box 173 \ 3 img120 | |
| Cover note attaching a copy of a letter sent to 'Oy' and advising a similar letter was sent to Mr. Inskip. | 4th Apr 1934 | Box 173 \ 3 img121 | |
| Thank-you letter to Mr. Maurice Olley for his assistance and the valuable information provided during a trip to America. | 12th Apr 1934 | Box 173 \ 3 img122 | |
| Results and suggestions from a visit to the U.S.A., proposing actions for design discussion. | 16th Apr 1934 | Box 173 \ 3 img123 | |
| Riding comfort and the issue of rolling in cars with independent front wheel suspension. | 16th Apr 1934 | Box 173 \ 3 img124 | |
| Suspension design, comparing American and English road conditions, and analyzing anti-rolling features of different chassis. | 16th Apr 1934 | Box 173 \ 3 img125 | |
| Comparison of Dubonnet and Cadillac wishbone suspension systems for the Spectre model. | 16th Apr 1934 | Box 173 \ 3 img126 | |
| Proposal discussing weight distribution, suspension, and wheelbase for the 'Spectre' model, comparing it to competitors. | 16th Apr 1934 | Box 173 \ 3 img127 | |
| Weight analysis from Pontiac, comparing figures and noting differences in how bumper weights are accounted for. | 16th Apr 1934 | Box 173 \ 3 img128 | |
| Weight specification sheet for the chassis and running gear of a 1934 Pontiac 4-Door. | 13th Feb 1934 | Box 173 \ 3 img129 | |
| Weight breakdown of chassis components including sheet metal and lamps for a 1934 Pontiac. | 13th Feb 1934 | Box 173 \ 3 img130 | |
| Detailed weight study breakdown for a 1934 Pontiac vehicle. | 14th Feb 1934 | Box 173 \ 3 img131 | |
| Weight analysis of a 4-door 1934 Pontiac chassis and running gear. | 14th Feb 1934 | Box 173 \ 3 img132 | |
| List of parts and their weights for the balance of a chassis, including sheet metal and lamps. | 14th Feb 1934 | Box 173 \ 3 img133 | |
| Weight breakdown sheet for a vehicle's body and equipment, detailing individual component weights in pounds. | 17th Apr 1934 | Box 173 \ 3 img134 | |
| Letter to the Detroit Athletic Club concerning a disputed account balance and requesting further information. | 17th Apr 1934 | Box 173 \ 3 img135 | |
| Letter to J.S. Inskip regarding the payment of accounts and clarification on an order from Amplex Manufacturing Co. | 17th Apr 1934 | Box 173 \ 3 img136 | |
| Letter from Illsley Company following up on tests of their closed radiation units, discussing valve sizes and enclosing testimonials. | 24th Mar 1934 | Box 173 \ 3 img137 | |
| Postscript discussing a visit to Prestone offices, a valve production license, and arrangements with the Cuno Corporation for the British market. | 17th Apr 1934 | Box 173 \ 3 img138 | |
| Letter to The Illsley Company in Detroit regarding the satisfactory testing of their closed radiation units and the requirement for them to be manufactured in England. | 17th Apr 1934 | Box 173 \ 3 img139 | |
| Letter to Curtiss Wright Co. discussing engine cooling, B.T.U.s, exhaust valve tests and glycol. | 18th Apr 1934 | Box 173 \ 3 img140 | |
| Letter from Harrison Radiator Corporation to Mr. W. A. Robotham regarding a recent visit and potential radiator developments. | 9th Apr 1934 | Box 173 \ 3 img141 | |
| Letter from Rolls-Royce of America concerning the accounting of a $300 fund and the status of various parts orders. | 10th Apr 1934 | Box 173 \ 3 img142 | |
| Invoice from the Aluminum Company of America for 16 permanent mold 'A' pistons. | 4th Apr 1934 | Box 173 \ 3 img143 | |
| Letter from Delco-Remy Corporation regarding a sample direction indicator and its potential installation. | 12th Apr 1934 | Box 173 \ 3 img144 | |
| Comparing Cadillac and Bentley engine valve timings, noting Cadillac's negative overlap and proposing an alternative camshaft for the Spectre. | 13th Apr 1934 | Box 173 \ 3 img145 | |
| Graph of Brake Mean Effective Pressure curves comparing various engines including Cadillac and Bentley. | 31th Jan 1934 | Box 173 \ 3 img146 | |
| Comparative chart of engine valve timings and B.M.E.P. curves for various Cadillac, La Salle, and Bentley models. | 31th Jan 1934 | Box 173 \ 3 img147 | |
| Night letter cable to Cadillac regarding criticism of their vehicle's handling and rolling on corners. | 19th Apr 1934 | Box 173 \ 3 img148 | |
| The purchasing of automobile parts in the U.S.A and settling accounts with Mr. Inskip of New York. | 13th Apr 1934 | Box 173 \ 3 img149 | |
| Telegram received by telephone regarding the expected arrival of the ship 'American Farmer'. | 19th Apr 1934 | Box 173 \ 3 img150 | |
| Letter from United States Lines confirming the expected docking time of the ship 'American Farmer'. | 19th Apr 1934 | Box 173 \ 3 img151 | |
| Short memo requesting information concerning an 'American Visit'. | 4th Apr 1934 | Box 173 \ 3 img152 | |
| Night letter cable to Detroit requesting shipping information and chassis number for a car. | 20th Apr 1934 | Box 173 \ 3 img153 | |
| Acquiring American car exhaust systems and Aerolite pistons for testing and experience. | 21th Apr 1934 | Box 173 \ 3 img154 | |
| Cadillac 16 gearbox, Lincoln gearbox, and Lincoln clutch, mentioning a picture and the imminent arrival of the Cadillac car for scaling. | 24th Apr 1934 | Box 173 \ 3 img155 | |
| From 'Wor' regarding an attached letter from Thos. F. Hamilton of Pratt & Whitney Aircraft Co. | 30th Apr 1934 | Box 173 \ 3 img156 | |
| Unofficial enquiries into a licence for Pratt & Whitney to manufacture engines in England. | 30th Apr 1934 | Box 173 \ 3 img157 | |
| Letter from Illsley Company regarding their closed radiation units and potential business opportunities. | 22th Apr 1934 | Box 173 \ 3 img158 | |
| List of American automobile and aviation engineers to be thanked for their goodwill during a visit to America. | 3rd May 1934 | Box 173 \ 3 img159 | |
| List of individuals and their affiliated companies, concluding with a note of thanks for assistance received. | 3rd May 1934 | Box 173 \ 3 img160 | |
| License from Pratt & Whitney for engine manufacture in England. | 3rd May 1934 | Box 173 \ 3 img161 | |
| Letter to J.S. Inskip of Rolls-Royce America regarding an upcoming invoice for piston rings. | 7th May 1934 | Box 173 \ 3 img162 | |
| Letter to Mr. Barnes of The Aluminium Co. of America acknowledging his letter and awaiting the arrival of pistons. | 5th May 1934 | Box 173 \ 3 img163 | |
| Letter to the Michigan Tool Co. inquiring about a cone worm for a supercharger drive. | 5th May 1934 | Box 173 \ 3 img164 | |
| Requesting the drafting of suitable letters and providing company paper for them. | 4th May 1934 | Box 173 \ 3 img165 | |
| Covering memo confirming that suggested letters have been written and are enclosed. | 8th May 1934 | Box 173 \ 3 img166 | |
| Letter to E.W. Seholm of Cadillac thanking him for his hospitality towards Mr. Robotham during his visit to America. | 7th May 1934 | Box 173 \ 3 img167 | |
| Letter to Commander Briggs of General Motors Proving Ground, thanking him for his help and wishing him a speedy recovery. | 7th May 1934 | Box 173 \ 3 img168 | |
| Letter of thanks to the Chief Engineer of The Hudson-Essex Co. for a factory visit. | 7th May 1934 | Box 173 \ 3 img169 | |
| Letter of thanks to General Pratt for the courtesy extended to Mr. Robotham during his visit to Wright Field. | 7th May 1934 | Box 173 \ 3 img170 | |
| Letter of thanks to Captain Powers for the courtesy extended to Mr. Robotham at Wright Field. | 7th May 1934 | Box 173 \ 3 img171 | |
| Letter of thanks to Mr. L.P. Saunders of The Harrison Radiator Corporation for the assistance provided to Mr. Robotham during his visit to America. | 7th May 1934 | Box 173 \ 3 img172 | |
| Letter to the Ethyl Gas Corporation regarding their work on overcoming the attack on exhaust valves by Ethyl. | 7th May 1934 | Box 173 \ 3 img173 | |
| Thank you letter to Robert Jardine of The Wilcox-Rich Valve Corporation for assistance provided in Detroit. | 7th May 1934 | Box 173 \ 3 img174 | |
| Thank-you letter to Dr. Lewis at Langley Field Research Station following a visit from Mr. Robotham. | 7th May 1934 | Box 173 \ 3 img175 | |
| Letter of thanks to Mr. Bower, Chief Engineer at The Buick Co., for the courtesy extended to Mr. Robotham during his visit. | 7th May 1934 | Box 173 \ 3 img176 | |
| Thank you letter to the Chief Engineer of the Graham-Paige Co. for courtesy extended during a factory visit. | 7th May 1934 | Box 173 \ 3 img177 | |
| Thank you letter to the Chief Engineer of Pontiac Motor Car Co. regarding a factory visit. | 7th May 1934 | Box 173 \ 3 img178 | |
| Letter to the Managing Director of The Eclipse Aviation Corporation thanking them for a factory visit. | 7th May 1934 | Box 173 \ 3 img179 | |
| Letter to Mr. Dawson of The Delco Electrical Corporation, thanking him for the courtesy extended to Mr. Robotham. | 7th May 1934 | Box 173 \ 3 img180 | |
| Thank-you letter to Mr. Sorenson at Ford Motor Car Co. for a factory visit. | 7th May 1934 | Box 173 \ 3 img181 | |
| Letter to the General Manager of Packard Co. thanking him for the courtesy extended during a factory visit. | 7th May 1934 | Box 173 \ 3 img182 | |
| Letter to Mr. Hobbs of Pratt & Whitney thanking him for the courtesy extended during a factory visit. | 7th May 1934 | Box 173 \ 3 img183 | |
| Letter of thanks to the President of the Curtiss-Wright Corporation for the courtesy extended to Mr. Robotham during a factory visit. | 7th May 1934 | Box 173 \ 3 img184 | |
| Letter to Ben Hopkins of The Cleveland Graphite Co. thanking him for a factory visit. | 7th May 1934 | Box 173 \ 3 img185 | |
| Letter of appreciation to The Vacuum Oil Co. for assistance provided by Mr. Dickey during a visit to Detroit. | 7th May 1934 | Box 173 \ 3 img186 | |
| Request to General Motors for details on their setup for observing valve movement. | 7th May 1934 | Box 173 \ 3 img187 | |
| Letter from Graham-Paige Motors Corporation regarding cone worm gear design and crankshaft characteristics. | 24th Apr 1934 | Box 173 \ 3 img188 | |
| Blueprint with diagrams and formulas for calculating the equivalent length and stiffness of a half journal. | 8th May 1934 | Box 173 \ 3 img189 | |
| Letter to Graham-Paige Motors discussing crankshaft design and torsional vibration issues. | 8th May 1934 | Box 173 \ 3 img190 | |
| Letter from the Detroit Athletic Club regarding a credit balance of $18.77 on an account. | 30th Apr 1934 | Box 173 \ 3 img191 | |
| Letter to The Detroit Athletic Club requesting payment for an outstanding amount of 13.77 dollars. | 14th May 1934 | Box 173 \ 3 img192 | |
| Letter from the Office of the President concerning accommodation and arrangements for Major Bulman's trip to America. | 16th Apr 1934 | Box 173 \ 3 img193 | |
| Letter from Maurice Olley at Cadillac to W. A. Robotham discussing a car's production, its springing, and an inquiry about a Bentley engine. | 25th Apr 1934 | Box 173 \ 3 img194 | |
| Letter from Frank P. Illsley regarding valve tests and potential business licensing opportunities. | 4th May 1934 | Box 173 \ 3 img195 | |
| Letter to the Cadillac Motor Car Company providing drawings and details of a Bentley engine. | 16th May 1934 | Box 173 \ 3 img196 | |
| Letter requesting details on a new small Buick and mentioning the receipt of a Graham-Paige and an awaited Cadillac. | 16th May 1934 | Box 173 \ 3 img197 | |
| Letter from the President's office authorizing Mr. E. W. Hives to sign papers for taking a Cadillac limousine to England. | 22th Mar 1934 | Box 173 \ 3 img198 | |
| Invoice from Aluminum Company of America for aluminum weld bars. | 4th Apr 1921 | Box 173 \ 3 img199 | |
| Invoice from the Aluminum Company of America for 16 Permanent Mold 'AA' Pistons. | 4th Apr 1934 | Box 173 \ 3 img200 | |
| Original packing memo from The Perfect Circle Co. detailing a shipment. | 10th May 1934 | Box 173 \ 3 img201 | |
| Letter from the American branch to the English branch concerning the settlement of various accounts. | 14th May 1934 | Box 173 \ 3 img202 | |
| Letter from Chrysler Motors' Amplex Division concerning an invoice, shipment, and payment confirmation. | 2nd May 1934 | Box 173 \ 3 img203 | |
| Invoice from Amplex Manufacturing Company for Oilite Inserts. | 2nd Sep 1934 | Box 173 \ 3 img204 | |
| Letter from the American branch to the UK branch detailing fund expenditures and requesting payment. | 14th May 1934 | Box 173 \ 3 img205 | |
| Letter from the Michigan Tool Company responding to an inquiry and arranging a visit from their London representative. | 24th May 1934 | Box 173 \ 3 img206 | |
| Letter from General Motors regarding information on an optical valve lift indicator. | 18th May 1934 | Box 173 \ 3 img207 | |
| Letter to Major G.E.A. Hallett of General Motors discussing a report on valve gear movement and developments with Cadillac tappets. | 31th May 1934 | Box 173 \ 3 img208 | |
| Letter from Rolls-Royce of America seeking approval to pay a late invoice of $2.51 from the New York Athletic Club on behalf of Mr. Robotham. | 12th Jun 1934 | Box 173 \ 3 img209 | |
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