Cannon firing shells that will fly by their own power with jet propulsion may be the outgrowth of a gun designed by Edward F., Chandler, New York engineer. The first experimental weapon is a light metal tube four feet long and three inches in diameter, shooting a shell six inches long and a little. more than two inches thick. Jets have been used to drive non-military projectiles up to 18 feet long, which supplies the basis for the present gun. Power and distance already have been achieved, but the problems of accuracy in flight, cheapness of construction, and types of fuel have not been solved.