| Description | Date | Identifier | |
| Night letter cablegram to Grylls in Detroit, USA, requesting particulars for measuring apparatus. | 4th Dec 1935 | Box 173 \ 4 img087 | |
| Cablegram from Mr. Grylls in the U.S.A. comparing twelve and eight-cylinder engines. | 6th Dec 1935 | Box 173 \ 4 img088 | |
| Telegram from Detroit discussing engine smoothness, comparing twelve and eight-cylinder designs, and flywheel flexibility. | 5th Dec 1935 | Box 173 \ 4 img089 | |
| Telegram received by telephone from Detroit regarding features of the Zephyr. | 5th Dec 1935 | Box 173 \ 4 img090 | |
| Night letter cablegram to Grylls in Detroit regarding carburettor flooding and hydraulic tappet adjusters. | 5th Dec 1935 | Box 173 \ 4 img091 | |
| Night letter cablegram with a list of technical queries. | 6th Dec 1935 | Box 173 \ 4 img092 | |
| Series of questions about cooler matrix back pressure and clutch plate cushioning. | 6th Dec 1935 | Box 173 \ 4 img093 | |
| Request for the latest particulars and specification of spring interleaf rubber used in shackles. | 6th Dec 1935 | Box 173 \ 4 img094 | |
| From the USA discussing variable speed fans, bearing materials, and methods to prevent drivetrain chunking. | 6th Dec 1935 | Box 173 \ 4 img095 | |
| Gasket design, steering shock elimination, and induction system porting. | 6th Dec 1935 | Box 173 \ 4 img096 | |
| Report page detailing a fix for rear main bearing leaks and observations on a Lincoln Zephyr engine. | 6th Dec 1935 | Box 173 \ 4 img097 | |
| Supercharger worm drives and engine smoothness, with comparisons to competitors' vehicles. | 6th Dec 1935 | Box 173 \ 4 img098 | |
| Letter on Book-Cadillac Hotel stationery regarding car performance, fans, and bearing materials. | 20th Nov 1935 | Box 173 \ 4 img099 | |
| And a diagram discussing gasket design, materials, and oil leak prevention. | 20th Nov 1935 | Box 173 \ 4 img100 | |
| And diagrams concerning chassis and exhaust system design on hotel letterhead. | 20th Nov 1935 | Box 173 \ 4 img101 | |
| And a diagram about changes to a casing, bearings and chassis. | 26th Nov 1933 | Box 173 \ 4 img102 | |
| On hotel letterhead regarding supercharger gears, engine tests, and roughness comparisons between different vehicles. | 26th Nov 1933 | Box 173 \ 4 img103 | |
| Cablegram from Detroit regarding a comparison of engine designs and features. | 5th Jul 1947 | Box 173 \ 4 img104 | |
| Telegram received by telephone concerning work on a Winton Compressor. | 7th Dec 1925 | Box 173 \ 4 img105 | |
| Cablegram requesting throat diameters for 'Twentyfive' and 'Spectre' down-draught carbureters. | 4th Dec 1935 | Box 173 \ 4 img106 | |
| Findings from visits to Cadillac and G.M. regarding tyre noise, engine options, and gearbox design. | 7th Dec 1935 | Box 173 \ 4 img107 | |
| Gear, bearing, and material considerations for engine and transmission components. | 1st Dec 1935 | Box 173 \ 4 img108 | |
| The manufacturing process and performance of flanged engine bearings, with comparisons to those used by Pontiac, Allison, and G.M. | 7th Dec 1935 | Box 173 \ 4 img109 | |
| From a visit to Cadillac and GM regarding vehicle noise reduction and suspension. | 23th Nov 1935 | Box 173 \ 4 img110 | |
| Memorandum discussing engine and chain drive designs, comparing different manufacturers and addressing issues like backlash. | 23th Nov 1935 | Box 173 \ 4 img111 | |
| Specifications for splines, gears, shafts, and synchromesh components. | 23th Nov 1935 | Box 173 \ 4 img112 | |
| Technical report discussing component wear, carburettor fit, and oil-related corrosion issues in bearings. | 23th Nov 1935 | Box 173 \ 4 img113 | |
| Hotel letterhead discussing engine component clearances, materials, and specifications. | 23th Nov 1935 | Box 173 \ 4 img114 | |
| Note on the difficulty of sourcing flanged trunnions and a material recommendation. | 7th Dec 1935 | Box 173 \ 4 img115 | |
| Cablegram about Stromberg carburettor fuel levels and a suggestion to machine the manifold. | 7th Dec 1935 | Box 173 \ 4 img116 | |
| Cablegram from Grylls to Robotham regarding measurements of nine-sixteenths and nine-thirty-seconds. | 7th Jul 1935 | Box 173 \ 4 img117 | |
| Cover note for an attached memo dated 23.11.35, received from America. | 7th Dec 1935 | Box 173 \ 4 img118 | |
| From Detroit discussing tyre noise and the use of rubber isolation in rear springs, with diagrams. | 23th Nov 1935 | Box 173 \ 4 img119 | |
| Rubber softening, steering components, and a comparison of gearbox spline design with General Motors. | 23th Nov 1935 | Box 173 \ 4 img120 | |
| Involute tooth splines and a visit to G.M. Corporation to discuss cadmium and lead bronze engine bearings. | 23th Nov 1935 | Box 173 \ 4 img121 | |
| Tray system and front and rear suspension ratings. | 8th Dec 1935 | Box 173 \ 4 img122 | |
| Cablegram from Detroit regarding specifications and shipping arrangements for Raybestos and Hyco lining fabrics. | 8th Dec 1935 | Box 173 \ 4 img123 | |
| Distributing the contents of three cablegrams received from America. | 9th Dec 1935 | Box 173 \ 4 img124 | |
| Cablegram from America regarding stiff rubber fabric mounting for Elliott bodies to address tyre noise. | 9th Dec 1935 | Box 173 \ 4 img125 | |
| Visit to American suppliers Federal Mogul and Long regarding bearings and clutches. | 9th Dec 1935 | Box 173 \ 4 img126 | |
| Report discussing centrifugal weights, clutch thrust bearings, slow running, crank dampers and exhaust pipe design. | 9th Dec 1935 | Box 173 \ 4 img127 | |
| Engine manifold design and harmonic damper considerations for various engine types. | 9th Dec 1935 | Box 173 \ 4 img128 | |
| Visit to Federal Mogul regarding their cadmium bearings, detailing composition, manufacturing processes, and performance claims. | 27th Apr 1935 | Box 173 \ 4 img129 | |
| Clutch designs, materials, and performance comparisons with other manufacturers. | 27th Apr 1935 | Box 173 \ 4 img130 | |
| And diagrams discussing methods for increasing engine power via intake and exhaust system design. | 27th Apr 1935 | Box 173 \ 4 img131 | |
| Engine design, focusing on manifold capacity and crankshaft damping. | 9th Dec 1935 | Box 173 \ 4 img132 | |
| Merits of acquiring competitor engines and cars, specifically the Cadillac Vee Eight and the Ford Lincoln Zephyr, for evaluation. | 9th Dec 1935 | Box 173 \ 4 img133 | |
| Cover note attaching a copy of a memo received from America. | 9th Dec 1935 | Box 173 \ 4 img134 | |
| Cablegram regarding acceptable gearbox and axle pinion slack on Buick and Hudson vehicles. | 11th Dec 1935 | Box 173 \ 4 img135 | |
| From Detroit discussing torsion bar and wishbone suspension designs, with reference to Olley's opinions and the Phantom III model. | 27th Nov 1935 | Box 173 \ 4 img136 | |
| Steering gear design, comparing Marles and Saginaw systems, and the principles of oversteering. | 10th Dec 1935 | Box 173 \ 4 img137 | |
| Potential purchase of an experimental Cadillac Vee 8 engine with a special flywheel for the Wraith II project. | 10th Dec 1935 | Box 173 \ 4 img138 | |
| Cover memo attaching a copy of a memo on the subject of steering received from the USA. | 10th Dec 1935 | Box 173 \ 4 img139 | |
| Modifications to steering boxes based on information from Cadillac and Saginaw. | 25th Nov 1935 | Box 173 \ 4 img140 | |
| Analysis and critique of steering gear components, including worm bearings, roller design, and rocker shafts. | 26th Nov 1935 | Box 173 \ 4 img141 | |
| Letter discussing discrepancies in helix angles and observations on gear manufacturing in Saginaw. | 26th Nov 1935 | Box 173 \ 4 img142 | |
| Relaying observations from a visit to the Lincoln Plant and an analysis of the Lincoln Zephyr vehicle. | 11th Dec 1935 | Box 173 \ 4 img143 | |
| Comparison of Lincoln, Spectre and Zephyr components, with a focus on the Gemmer steering system. | 11th Dec 1935 | Box 173 \ 4 img144 | |
| Book-Cadillac Hotel letterhead about a visit to the Lincoln plant and an assessment of a K model LeBaron. | 30th Nov 1933 | Box 173 \ 4 img145 | |
| Engine specifications and test observations, including dimensions, drives, cowling tests, and gear backlash, with a comparison to the Zephyr. | 22th Jul 1913 | Box 173 \ 4 img146 | |
| Engine components, their wear, lubrication, and manufacturing on hotel letterhead. | 11th Dec 1935 | Box 173 \ 4 img147 | |
| Telegram received by telephone from Detroit regarding gearbox slack and clutch splines on Buick and Hudson cars. | 11th Dec 1935 | Box 173 \ 4 img148 | |
| Secret internal memo detailing a cable exchange with Cadillac regarding a Vee '8' flexible flywheel. | 11th Dec 1935 | Box 173 \ 4 img149 | |
| Cablegram from Detroit regarding the unimportance of gearbox slack for chunking, provided other components are within tolerance. | 11th Oct 1935 | Box 173 \ 4 img150 | |
| Covering note attaching a copy of a memo received from the U.S.A. | 12th Dec 1935 | Box 173 \ 4 img151 | |
| Visit to Gemmer Manufacturing Co. in Detroit to discuss steering gear designs. | 30th Nov 1935 | Box 173 \ 4 img152 | |
| Technical comparison of Gemmer and Saginaw steering gear components and manufacturing processes. | 30th Nov 1935 | Box 173 \ 4 img153 | |
| Saginaw vs. Gemmer steering gears and a performance analysis of a Lincoln Zephyr 12. | 30th Nov 1935 | Box 173 \ 4 img154 | |
| Typed report page discussing steering, brakes, and gears of a new car during a test. | 30th Nov 1935 | Box 173 \ 4 img155 | |
| Requesting a joint report from two individuals, DA and Gry, following their visit to the USA. | 30th Nov 1935 | Box 173 \ 4 img156 | |
| Western Union cablegram from New York regarding cadmium bearings, oil corrosion, and a cost estimate. | 14th Dec 1935 | Box 173 \ 4 img157 | |
| Telegram received by telephone from Detroit regarding the price and availability of bearings. | 14th Dec 1935 | Box 173 \ 4 img158 | |
| Night letter cablegram to Federal Mogul Company instructing them not to proceed with Bentley bearings. | 16th Dec 1935 | Box 173 \ 4 img159 | |
| Comparing the engine smoothness and crankshaft designs of Cadillac and Packard V-12s and V-8s, discussing issues like deflection and bearings. | 16th Oct 1935 | Box 173 \ 4 img160 | |
| Cadillac V-8 crankshaft distortion and downdraught arrangement improvements. | 16th Dec 1935 | Box 173 \ 4 img161 | |
| Engine 'chunking' issues, automatic chokes, and silent tappets, with comparisons to Packard, Buick, and Cadillac vehicles. | 16th Jan 1938 | Box 173 \ 4 img162 | |
| Push rod deflection, a new camshaft component, self-lubricating bearings, and future car frame design suggestions. | 16th Dec 1935 | Box 173 \ 4 img163 | |
| Blueprint diagram illustrating a suggested design for a Bentley front end. | 16th Dec 1935 | Box 173 \ 4 img164 | |
| Comparison of Cadillac, Packard, and Lincoln engines, focusing on crankshafts, bearings, and performance. | 16th Dec 1935 | Box 173 \ 4 img165 | |
| Comparing Cadillac and Packard engine components and discussing crankshaft balance. | 16th Dec 1935 | Box 173 \ 4 img166 | |
| Crankshaft balance and design, with a comparison to the Cadillac V8 downdraught arrangement, including sketches. | 16th Dec 1935 | Box 173 \ 4 img167 | |
| Chattering in automatic chokes and engine checking procedures. | 16th Dec 1935 | Box 173 \ 4 img168 | |
| Book-Cadillac Hotel letterhead comparing performance and issues with competitor vehicles. | 16th Dec 1935 | Box 173 \ 4 img169 | |
| Technical notes on silent tappets, discussing Cadillac's advice and the Wilcox-Rich lifter. | 16th Dec 1935 | Box 173 \ 4 img170 | |
| Letter discussing self-lubricating bearings and car body specifications for a Bentley and a Phaeton. | 16th Dec 1935 | Box 173 \ 4 img171 | |
| Pencil sketch of a component, possibly a Panther engine front-case, with handwritten notes. | 17th Dec 1935 | Box 173 \ 4 img172 | |
| Requesting a general report from DA and Gry upon their return. | 17th Dec 1935 | Box 173 \ 4 img173 | |
| Letter from Link-Belt Company providing recommendations on chain drive installations. | 18th Dec 1935 | Box 173 \ 4 img174 | |
| Continuation of a letter from Link-Belt Company regarding a roller chain and automatic adjustment. | 18th Dec 1935 | Box 173 \ 4 img175 | |
| Technical observations from a visit to Buick in America. | 24th Dec 1935 | Box 173 \ 4 img176 | |
| Visits to Hudsons and Cleveland Graphite Bronze Company regarding axle, suspension, and bearing technologies. | 24th Dec 1938 | Box 173 \ 4 img177 | |
| Engine oil flow, bearing clearances, and a new type of cast-iron material from Detroit. | 24th Dec 1935 | Box 173 \ 4 img178 | |
| Letter from Cadillac's Chief Engineer enclosing experimental prints of a flexible flywheel. | 27th Dec 1935 | Box 173 \ 4 img179 | |
| Letter to the Chief Engineer of Cadillac Motor Car Company regarding the exchange of drawings for cylinder heads and flywheels. | 31th Dec 1935 | Box 173 \ 4 img180 | |
| List of suggested experimental drawings required as a result of a visit to the U.S.A. | 1st Jan 1936 | Box 173 \ 4 img181 | |
| Visit to Strombergs to inspect their carburetter testing apparatus. | 1st Jan 1936 | Box 173 \ 4 img182 | |
| Blueprint diagram of Stromberg equipment for testing aero engines. | 1st Jan 1936 | Box 173 \ 4 img183 | |
| Conversation with Strombergs regarding carburetter flooding and recommendations to prevent percolation. | 1st Jan 1936 | Box 173 \ 4 img184 | |
| Analysis of downdraught carburettor percolation issues and proposed solutions including choke jacketing. | 1st Jan 1936 | Box 173 \ 4 img185 | |
| Notes on aero carburettor testing methods, a visit to Briggs to review car designs, and tappet designs from Wilcox Rich. | 1st Jan 1936 | Box 173 \ 4 img186 | |
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