AMERICAN $3.00 THE MAGAZINE THEATRICAL * OF MOTION TELEVISION * PICTURE 16mm IN PHOTOGRAPHY COMMERCIAL * AMATEUR toVTH James VanTrees uses eight cameras to shoot Groucho Marx Show for television. YEARLY (Story on Page 114.) * 'Reverse Action' Tricks For Amateurs * MGM's New Ansco Color Filming System * New Bell & Howell Magnetic Recorder-Projector U.S.