Photographic Surveying Including the Elements of Descriptive Geometry And Persp
Photographic Surveying Including the Elements of Descriptive Geometry And Persp
Edouard Gaston Daniel Deville
The book Photographic Surveying Including the Elements of Descriptive Geometry And Persp was written by author Edouard Gaston Daniel Deville Here you can read free online of Photographic Surveying Including the Elements of Descriptive Geometry And Persp book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Photographic Surveying Including the Elements of Descriptive Geometry And Persp a good or bad book?
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For distances of 500, 400, 300, 200 and 100 metres and with a lens of 212 millimetres focus, the displacement of the focal plane should only be 0'09, 0*11, 0'15, 0-22 and 045 millimetres respectively. For shorter distances, the lens has a motion in the direction of the axis to the extent of two millimetres. This brings in focus objects situated at 23 metres from the instrument. Lii the helicoidal slit cut in the outer tube of the lens is a small block t screwed to the inner tube. Both tubes are... clamped together by the screw shown at the end of the slit. Unscrewing it and turning the inner tube from right to left brings the lens out. The nclination of the slit to the axis is such, as to correspond to a motion SURVEYING CAMERAS. 133 of two millimetres in the direction of the axis when the block t travels from one end of the slit to the other. These two extreme positions are indicated by the graduations and 2 on the outer tube opposite the index mark on t. The interval is divided into twenty parts, so that the displacement of the lens is read directly to O'l millimetre.
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