With speedy bombers and pursuit planes being equipped for taking pictures, ordinary aerial cameras with maximum shutter speed of 1/150 of a second are much too stow for effective work, according to Revere G. Sanders, of the Fairchild Aviation company, since such planes attain speeds of 400 miles per hour and sometimes operate as low as 500 feet from the ground. Although this exposure is fast enough for pictures from greater altitudes, or from lower heights with slower planes, faster shutter speeds are needed for today’s military planes. Assuming that movement of the image on the film amounting to one twenty-fifth of an inch would be the greatest permissible, Mr. Sanders recommended, after experiments, that cameras be made with a speed of % second to give satisfactory results at 500 miles an hour from 500 feet.