Pneumatic ball pitching machine for different sized balls

A ball projecting machine for propelling a ball at a desired set speed from a barrel, which comprises a frame supporting a barrel whereby balls are propelled therethrough an air pressure tank, an air pressure control valve, ball admitting means for admitting a ball into an area juxtaposed said air pressure control valve and said barrel from which said ball is propelled, a housing secured at one end to said means for admitting a ball into the area from which the ball is propelled, means connected to and between said outer end of said barrel and means adjacent said ball admitting means for longitudinally moving said barrel, and said barrel is slidable within said housing to open said means for admitting said ball and to close said ball admitting means so that said ball is propelled through said barrel, said barrel having sufficient length to extend with an inner end adjacent said air pressure control valve from which the ball is propelled and an outer end which extends beyond an open end of said housing.