. Problems in physics. Derived from military situations and experience . e direction offlight. It also appears that the same scale is not accuratefor measuring distances, on the same print, in a directionparallel to the direction of flight. What is the greatest pos-sible error, in meters, on the ground? Use data under (a)and (b). 21. If double images are found in successive strips across a plate, taken with a focal plane shutter, and it is expected to elimi-nate the trouble with future negatives, what is the mostprobable cause of the difficulty? Why do the double imagesnot occur all over the p
. Problems in physics. Derived from military situations and experience . e direction offlight. It also appears that the same scale is not accuratefor measuring distances, on the same print, in a directionparallel to the direction of flight. What is the greatest pos-sible error, in meters, on the ground? Use data under (a)and (b). 21. If double images are found in successive strips across a plate, taken with a focal plane shutter, and it is expected to elimi-nate the trouble with future negatives, what is the mostprobable cause of the difficulty? Why do the double imagesnot occur all over the plate? 22. If a between-the-lens shutter were used with the same camera would double images occur? When would they occur?How would they be distributed over the plate? 23. If you are using a focal plane shutter 24 centimeters wide, with a f^-inch slit, on an 18x24 centimeter plate, for exposures of1/100 second, in how many places on the plate will there beblurring if the camera is vibrating with a frequency of 50vibrations per second through an amplitude of 1/10 degree?. G Y. AERIAL PHOTOGRAPHY THE NEGATIVE LENS FINDERWhen isolated objectives are to be photographed some sort ofsight is necessary. It is especially convenient if the operator canlook down through a hole in the bottom of the plane but the con-struction of the plane seldom permits of a large enough hole. Thisdifficulty was partially overcome by the use of a rectangularnegative lens in the floor of the plane. PROBLEMS 24. A 5x6 rectangular lens with a focal length of minus 11 inches, is to be used as a finder for a 18x24 centimeter platecamera with a 20-inch focal length lens. The rectangularlens is to be placed in the floor of the fuselage, 34 inches be-low the eye of the photographer. What size should arectangle at the surface of the lens be made if it is to justoutline the field of the camera? Note: This lens serves thesame purpose as the direct view finder of the ordinaryhand camera. 25. What is the size of the hol
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