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18X24 centimeter 4X5 inch 50 centimeter aerial cameras aerial photographic Air Service airplane camera altitude angle aperture apparatus astigmatic automatic camera axis bell crank camera body camera Fig camera mountings carried center of gravity centimeter plate cockpit color sensitiveness contrast curtain deRam desired direction distance distortion electric emulsions exposed exposure field film camera flying flying boat focal length focal-plane shutter focus focussing French front fuselage glass ground speed gyroscope hand camera hand-held camera Hurter and Driffield illumination interval lenses lever light magazine mapping mechanism meters method Metol motion motor necessary negative objects oblique observer operation ordinary orthochromatic overlap panchromatic paper photographic lens pilot plane plate camera plate changing position possible practice prints problem propeller rotating sensitometry sheaths shown in Fig shows side sight stereo stereogram stereoscopic surface tension tion vertical vibration wind wire
Page 112 - There has been some difference of opinion as to whether it is ever advisable to go further than this with plate cameras.
Page 57 - ... combinations of four simple lenses. These are the types of lenses used in many aerial cameras. Fig. 6. A diagram to show how the focal length of a lens is measured. As focal length is to height so is the width or length of plate to the width or length of the ground covered. The scale is therefore directly proportional to the focal length and inversely proportional to the altitude. f = focal length of the lens, h = height at which photo is taken, w = width or length of plate in inches. 1 = lineal...
Page 16 - ... shoots" and bomb explosions. The exact configurations of front, second, third line and communicating trenches, the machine gun and mortar positions, the "pill boxes," the organized shell holes, the listening posts, and the barbed wire, were all revealed, studied and attacked entirely on the evidence of the airplane camera. Toward the end of the war important troop movements were possible only under the cover of darkness, while the development of high intensity flashlights threatened to expose...
Page 423 - To renew ihe charge, book must be brought fo ihe desk. TWO WEEK BOOK DO NOT RETURN BOOKS ON SUNDAY DATE DUE DEC...
Page 218 - Variation of average daylight intensity during the day. daylight during the course of the day and during the course of the year. Measurements showing typical variations from morning to night are exhibited in Fig. 101, from which it appears that there is an increase in illumination of four to five times from 8 o'clock — when it would be considered full daylight for purely visual observation — until noon, while there is a corresponding decrease by four o'clock.
Page 15 - ... immediate communication between plane and earth. The volume of work done by the photographic sections of the military air service steadily increased until toward the end of the war it became truly enormous. The aerial negatives made per month in the British service alone mounted into the scores of thousands, and the prints distributed in the same period numbered in the neighborhood of a million. The task of interpreting aerial photographs became a highly specialized study. An entirely new activity...
Page 388 - At a single glance lie notes the objects of interest within his radius of easy travel. The guide-book of the future will therefore be incomplete without numerous aerial views, both vertical and oblique. As an illustration of the peculiar merit of the view from the air, consider the photograph of Vienna made during d'Annunzio's "propaganda
Page 383 - ... mechanism in the camera. CHAPTER XXXII PICTORIAL AND TECHNICAL USES Aside from their element of novelty, aerial photographs have undouted qualities of beauty and utility. The "bird'seye view...
Page 37 - ... the shutter speed required; means of supporting the camera to protect it from the vibration of the plane. Mosaic maps are built up from a large number of photographs of adjacent areas. In addition to the above requirements, mosaic maps demand lenses free from distortion and covering as large a plate as possible, in order to keep to a minimum the number of pictures needed to cover a given area; means for keeping the camera accurately vertical, and means for changing the plates or films and resetting...
Page 384 - Cathedral. of other large objects. Heretofore such views have usually had to be drawn by an Imaginative artist. Aerial oblique views possess the virtues both of pictures and of plans. They are destined to be extensively used in the study of architecture (Fig. 188). Cathedrals, castles.