douglas self, audio design, subjectivism, combat cutlery, compressed-air amplifiers, electromechanical amplifiers, optical telegraphs, auxetophone, heliographs, voicepipes, monowheels, diwheels, schilovski gyrocar, gyrocars, brennan gyro-monorail, steam-powered bicycles, rocket-powered bicycles, unusual bicycles, unusual tricycles, quadcycles, quadricycles, steam lawnmowers, steam aeroplanes, unusual steam locomotives, armoured narrowboat, jet-propelled paddleboat, helicogyre, cyclogyro, propeller-driven car, propeller-driven sleigh, propellor-driven locomotives, compressed-air vehicles, rotating steam boilers, rotary steam engines, tower spherical engine, disc engines, vibratory steam engines, parsons epicyclic engine, rotary internal combustion engines, rotary valve ic engines, high-speed steam engines, uniflow steam engines, still steam-diesel engine, ammonia motor, zeromotor, boiling petrol, alcohol motor, carbon disulphide engines, soda engines, carbonic acid engines, odd working fluids, ether engines, water engines, water motors, thermomagnetic motors, clockwork, dog engine, electromagnetic engines, mechanical rectification, thermo-electric generators, gearwheels from hell, electrostatic boiler, aerosteam engine, square piston engine, perfect, tye, roswell

devoted to allis chalmers tractors and allis-chalmers farm equipment from 1914 thru 1985. unofficial ac web page.

military trader/vehicles is dedicated to collecting, preservation, restoration of military artifacts and historic military vehicles.

the busiest antique tractor parts site on the internet with thousands of pages of information plus discount prices for parts and manuals. photos, specs, articles, hundreds of classified ads, 24 forums, repair advice and much more. serving the antique tractor community since 1995.

home model engine machinists & makers forum. model engine making forums for engine plans, castings, cad, cnc designs, lathe, stirling, boilers & steam.