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Updated: May 7, 2025
To a large extent the plane-table is used. In the hands of the topographers of the Geological Survey, the plane-table is not simply a portable draughting table for the field; it is practically an instrument of triangulation, and all minor positions of the details of topography are determined through its use by trigonometric construction. The scale on which the map is made is variable.
"Many Germans," wrote an Italian Review, "serving in Italian establishments are in possession of lists of the fortresses, measurements, distances, positions of the roads and footpaths, they have found the points of triangulation and acquired all requisite data and information about them. And to-morrow, should war break out, they will accompany and guide the German or Austrian invaders."
The outcome of the meeting was a directive to take further steps to obtain positive identification of the UFO's. Our original idea of attempting to get several separate reports from one sighting so we could use triangulation to measure speed, altitude, and size wasn't working out. We had given the idea enough publicity, but reports where triangulation could be used were few and far between.
I said something about triangulation, once; the stately word pleased his ear; he inquired what it meant; I explained; after that he quietly and inoffensively ignored my name, and always called me Triangle. What an enthusiast he was in cattle! At the bare name of a bull or a cow, his eye would light and his eloquent tongue would turn itself loose.
The altitude given on the present maps for Denali is the mean of determinations made by triangulation by three different men: Muldrow on the Sushitna side in 1898, Raeburn on the Kuskokwim side in 1902, and Porter, from the Yentna country in 1906. In addition, a determination was made by the Coast and Geodetic Survey in 1910, from points near Cook's Inlet.
Part of my work was to construct signal stations by piling rocks at conspicuous points on the well-rounded hills so as to enable the triangulation to proceed as rapidly as possible. During the night some of these signal stations would disappear, torn down by the superstitious shepherds who lived in scattered clusters of huts and declined to have strange gods set up in their vicinity.
Tyers' difference of longitude by triangulation to the east entrance point of the Glenelg River, 37 minutes 29 seconds, which is 1 minute 27 seconds more than his chronometric measurement; the mouth of the Glenelg will be 10 degrees 13 minutes 51 seconds West of Sydney. By Mr.
We visited, on our way, the stations indicated by Méchain; we made some important modifications in the projected triangulation, and at once commenced operations. An inaccurate direction given to the reflectors established at Iviza, on the mountain Campvey, rendered the observations made on the continent extremely difficult.
But these operations shrink into insignificance by comparison with Sir David Gill's grandiose scheme for uniting two hemispheres by a continuous network of triangulation. The history of geodesy in South Africa began with Lacaille's measurements in 1752.
An examination of the map will show that the triangulation of the various organizations is already largely in advance of the topography. The map of the United States will be a great atlas divided into sheets as above indicated. In all of those areas where the survey is on a scale of 1-250,000, a page of the atlas will present an area of one degree in longitude and one degree in latitude.
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