Physical description:

1. Hallett Correspondence, U.S. Signal Corps (1915-1918) 2. Hallett Correspondence, Army Air Corps (1918-1921) 3. Hallett Correspondence, General Motors (1931-1955) 4. Hallett Correspondence, Consolidated Aircraft Corporation (1942-1944) Includes letters to and from Reuben H. Fleet, and between Hallett and outside individuals and companies. Topics are quite far ranging and innovative, including the cycle-weld process, spark plug and ignition harness design, airplane and helicopter engines, including rotary and small jet engines, the Crosley concept automobile, development of water supply wells at Consolidated, developing a water recovery system, aerial refueling concepts, development of a small helicopter, the Cylcopter concept, air freighter troop container, transporting gasoline from Los Angeles, converting the B-24 to a two engine cargo plane, airport runway lighting concept, solar evaporation of waste fluids, invention agreements, rotating wing aircraft, transporting gasoline to China, liquid oxygen and liquid hydrogen as fuel, candidate air tanker cargoes, fog dissipation concept, and the Burnelli planes. 5. Hallett Correspondence, Miscellaneous (1914-1981) 6. Draft Board Records (1917) 7. George Hallett Last Will and Testament (1938) 8. Arizona Tungsten Ore Mining Correspondence, Claims and Records (1938-1940) 9. Correspondence from J.J. Smith Documenting 138th Aero Squadron History (1958) 10. Correspondence with Peter Beck Concerning OX Engine (1959) Technical Reports and Special Studies 11. Airplane Motors, A Practical Course of Instruction in the Principles, Overhauling, and Care of Airplane Motors, George E.A. Hallett, copyrighted 1917, printed 1918, Washington, Government Printing Office 12. Airplane Motors Instruction Book Notes (circa 1918) 13. Notes on Starting Curtiss V8 60 Horsepower Engine 14. Notes and Rules for Pilots (circa 1918) 15. Inspection of Aeroplanes before Flights (circa 1918) 16. Principle Characteristics of Foremost Engines of 1918 17. Martin Club Address (Glenn L. Martin Company, circa 1918) 18. Digest of Development of Aviation Engines, 1914 to 1919 19. Outline of Policy for the Power Plant Department at McCook Field (1919) 20. Probable Future Development of Aeronautics in War and Commerce Including Both Heavier-than-Air and Lighter-than-Air Branches (1920) 21. Specification for Air Cooled Engine for Pursuit Type Airplane (U.S. Army - 1920) 22. Development of Efficient Air - Cooled Cylinders (1919-1923) 23. Hallett Valve Design Sketches (1920-1921) 24. Effect on Cylinder Performance at Variations in Stroke Length and Compression Ratio, McCook Field (circa 1924) 25. Notes of a Proposed Engine of the Engineering Division, Wright Field (1929) 26. Desirable Engine Characteristics (1929) 27. Wright Cyclone Engine Performance (circa 1930) 28. Bristol Phoenix Diesel Engine Performance (circa 1930) 29. Proposed Eight Cylinder Engine Sketch (circa 1930) 30. Soap Bubble Formulae (circa 1930)

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