The battle-plane is exhibited with all its military equipment, including two Marlin machine-guns fixed on the front cowling and fired through the propeller at a rate of 750 rounds at 1,650 R. P. M. of the engine, and two movable Lewis machine-guns at the rear cockpit which fire 650 rounds per minute. The wireless carried has a range of eleven miles to another aeroplane and a receiving radius of forty-seven miles by a ground-station. A camera located to the rear of the observer is worked by means of wind-vane. Photographs are taken at the rate of twenty-four per minute, and magazine carries six dozen plates. A full complement of twelve bombs are carried under the lower wings, and flare-lights for night-landing are suspended from the wing-tips. Red and green guide-lights are carried on the lower plane, and a white light is located on the fuselage deck aft of the gunner. The engine is one of the first Libertys to be built. _The T-4 Messenger_ The “Messenger” was designed as a war-machine, but after being modified in small details it makes an ideal machine for commercial and sporting purposes. As a war-machine its use was to have been in carrying messages from the front lines to headquarters and in general liaison work. The machine is exceptionally light and easy to fly, making it possible to make landings in places that have been heretofore inaccessible. The fuselage has absolutely no metal fittings nor tie-rods of any sort, strips of veneer being used exclusively for the bracing. The machine comes within the means of the average sportsman, for its cost is said to be not much over $2,000. Span, upper plane 19′ 3″ Length 17′ 6″ Weight, unloaded 476 lbs. Weight, loaded 636 lbs. Engine, air-cooled De Palma 37 H. P. The engine is a 4-cylinder air-cooled V type, manufactured by the De Palma Engine Company of Detroit. Its weight is 3.7 pounds per horse-power. The engine consumes 4 gallons of gasoline per hour, and tank has a capacity of 12 gallons. Oil is carried in the crank-case. GALLAUDET AIRCRAFT CORPORATION _Gallaudet E-L 2 Monoplane_ Striking originality in design was shown in the twin-pusher monoplane exhibition by the Gallaudet Aircraft Corporation. Mr. Gallaudet’s 1919 Sport Model has a high factor of safety and is easily maintained. Two stock “Indian” motorcycle engines are located in the nose of the fuselage, connected to a common transverse shaft, and resting on the top of the plane, and driving twin-pusher propellers on longitudinal shafts driven by bevel-gears. Engines are “oversize” models, giving 20 horse-power each at 2,400 R.P.M. Weight, 89 pounds each. Propellers are 3-bladed, 4 feet 8 inches in diameter, and 7 feet in pitch. Propellers run at one-half engine speed, 1,200 R. P. M. The plane has a span of 33 feet.