. Problems in physics. Derived from military situations and experience . » -I fl ^ .iso ofe iw ^ fl)C o> *-G 2 ffl « S ft • bo a a a S S PS » s. S « m a §5ais o 3 S ^ia (S « rj C -Oa! . d Jh en uSua) s5 >> AERIAL PHOTOGRAPHY 97 10. A camera mounting is being designed for a camera with a 20- inch lens. A sharpness corresponding to an image move-ment of not more than 1/250 inch is required. What is themaximum permissible angular velocity of the vibration ofthe camera if it is to be used at a height of 10,000 feet withexposures as long as 1/100 second; (a) When the directionof vibration
. Problems in physics. Derived from military situations and experience . » -I fl ^ .iso ofe iw ^ fl)C o> *-G 2 ffl « S ft • bo a a a S S PS » s. S « m a §5ais o 3 S ^ia (S « rj C -Oa! . d Jh en uSua) s5 >> AERIAL PHOTOGRAPHY 97 10. A camera mounting is being designed for a camera with a 20- inch lens. A sharpness corresponding to an image move-ment of not more than 1/250 inch is required. What is themaximum permissible angular velocity of the vibration ofthe camera if it is to be used at a height of 10,000 feet withexposures as long as 1/100 second; (a) When the directionof vibration is at right angles to the motion of the airplane? (b) When parallel? Assume a maximum ground-speed of 90 miles per hour. 11. A camera mounting is being designed for a camera with a 20- inch lens. A sharpness corresponding to an image move-ment of not more than 1/250 inch is required with exposuresof 1/100 second. What is the maximum permissible angularamplitude of vibration if it is known that the frequency ofthe vibration will be 50 per second; (a) When the directionof vibration is at right angles to the motion of the airplane?(b) When p
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