 | 1893 - 666 Seiten
...as the fixing of a rock or shoal, or of additions to a chart, as fresh soundings or new buildings. In all such cases angles should be taken to several...means of checking the accuracy of the chart itself. In the case of ordinary soundings, it is only necessary to take a third angle now and then ; firstly,... | |
 | Great Britain. Hydrographic Department - 1897 - 938 Seiten
...as the fixing of a rock or shoal, or of additions to a chart, as fresh soundings or new buildings. In all such cases angles should be taken to several...means of checking the accuracy of the chart itself. In the case of •ordinary soundings, it is only necessary to take a third angle now and then ; firstly,... | |
 | 1900 - 48 Seiten
...as the fixing of a rock or shoal, or of additions to a chart, as fresh soundings or new buildings. In all such cases angles should be taken to several...means of checking the accuracy of the chart itself. In the case of ordinary soundings, it is only necessary to take a third angle now and then; firstly,... | |
 | 1900 - 580 Seiten
...buildings. In all such cases angles should be taken to several objects", the more the better; but Hve objects is a good number, as the four angles thus...means of checking the accuracy of the chart itself. In the c*se of ordinary soundings, it is only necessary to take a third angle now and then ; firstly,... | |
 | 1911 - 684 Seiten
...such as the fixing of a rock or shoal, or of additions to a chart of fresh soundings or new buildings. In all such cases angles should be taken to several...means of checking the accuracy of the chart itself. In the case of ordinary soundings, it is only necessary to take a third angle now and then : firstly,... | |
 | United States. Hydrographic Office - 1915 - 590 Seiten
...or of fresh soundings or new buildings as additions to the chart, the sextant should invariably bo used. In all such cases angles should be taken to...taken the observer's accuracy is also checked. In tho case of ordinary soundings a third angle need be taken only occasionally; first, to check the general... | |
 | United States. Hydrographic Office - 1917 - 670 Seiten
...either taking or plotting a bearing might under such circumstances put the ship ashore. In all oases where great accuracy of position is desired, such...check the general accuracy of the chart, as above ttated; second, to make certain that the more important soundings, as at the end of a line, are correctly... | |
 | Great Britain. Hydrographic Department - 1925 - 490 Seiten
...such as the fixing of a rock or shoal, or of additions to a chart of fresh soundings or new buildings. In all such cases angles should be taken to several...means of checking the accuracy of the chart itself. In the case of ordinary soundings, it is only necessary to take a third angle now and then ; firstly,... | |
 | U.S. Coast and Geodetic Survey - 1926 - 374 Seiten
...or new buildings. In such cases angles should be taken to several objects, the more the better: hut five objects is a good number, as the four angles thus obtained prevent any errors. When only two objects are visible, a sextant angle can be used to advantage with... | |
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In all such cases angles should be taken to several objects, the more the better; but five objects is a good number, as the four angles thus obtained not only prevent any errors, but they at once furnish a means of checking the accuracy of the chart itself. 