Geographical Surveying, Its Uses, Methods and Results |
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Common terms and phrases
accuracy alti altitude aneroid angles astronomical station azimuth BAROMETRIC FORMULAS barometric hypsometry base base-line Brazil camp cañon centimetre cistern barometer cloth Commission computations contour lines delineation determination direction distance draughtsman elevation Empire of Brazil engineer equal equator especially favorable field formula geodetic geographical survey geological geologist gineer graduated graphical surveys greater gulation height illustrations important instru instrument kilo land latitude latitude and longitude length less liable meander station meander survey means measurement ment mercurial meridian meteorological meteorologist meters method of survey metres mountain stations necessary nomical odometer party peaks position possible practical probable error railway reconnoissance reference station reliable right ascension Rio de Janeiro river roads route season sextant sketches square kilometres streams sufficient surface theodolite thermometer three-point problem three-point station tion topographical station trails triangulation stations true tude valley vertical vicinity
Popular passages
Page 80 - Then, by lines of sight, which shall be intersected by other rays from other topographical or triangulation stations, the most prominent features within a radius of twenty or thirty...
Page 74 - The angles which lie between the visible points of the triangnlation scheme are read and repeated singly and in combinations, the time chosen usually being in the evening, or in the early morning when the sun is behind the hills, and the rim of the earth is seen in silhouette against the rosy background of the sky. The topographical station is occupied to secure local topography, and from it angles ure read to three or more known points.
Page 32 - The germ of almost all that can be said on the subject is contained in these sensible remarks, which agree in spirit with Lord Chesterfield's well-known axiom, that whatever is worth doing at all, is worth doing well ; for we presume no one will deny that dining is amongst the things worth doing Occasionally.