| Nathaniel Bowditch - 1906 - 670 pages
...usually plotted by means of the three-armed protractor, or station-pointer (see art. 432, Chap. XVII). Set the right and left angles on the instrument, and...is not at hand, the tracing-paper protractor will prove an excellent substitute, and may in some cases be preferable to it, as, for instance, when the... | |
| U.S. Coast and Geodetic Survey - 1912 - 178 pages
...case of a metal instrument, or the radial lines in the case of a transparent or celluloid instrument, pass respectively and simultaneously through the three objects. The center of the instrument will then mark'the slu'p's position, which may be pricked on the chart or marked with a pencil point through... | |
| United States. Hydrographic Office - 1915 - 590 pages
...two angles observed between the three selected objects are set on the instrument, which is then moved over the chart until the three beveled edges pass...marked with a pencil point through the center hole. The transparent xylonite protractor is an excellent substitute for the brass instrument and in some... | |
| United States. Hydrographic Office - 1915 - 658 pages
...two angles observed between the three selected objects are set on the instrument, which is then moved over the chart until the three beveled edges pass...marked with a pencil point through the center hole. The transparent xylonite protractor is an excellent substitute for the brass instrument and in some... | |
| United States. Hydrographic Office - 1915 - 418 pages
...two angles observed between the three selected objects are set on the instrument, which is then moved over the chart until the three beveled edges pass...marked with a pencil point through the center hole. The transparent xylonite protractor is an excellent substitute for the brass instrument and in some... | |
| United States. Hydrographic Office - 1915 - 1286 pages
...two angles observed between the three selected objects are set on the instrument, which is then moved over the chart until the three beveled edges pass...marked with a pencil point through the center hole. The transparent xylonite protractor is an excellent substitute for the brass instrument and in some... | |
| United States. Hydrographic Office - 1916 - 516 pages
...two angles observed between the three selected objects are set on the instrument, which is then moved over the chart until the three beveled edges pass...marked with a pencil point through the center hole. ' The transparent xylonite protractor is an excellent substitute for the brass instrument and in some... | |
| United States. Hydrographic Office - 1916 - 608 pages
...two angles observed between the three selected objects are set on the instrument, which is then moved over the chart until the three beveled edges pass...marked with a pencil point through the center hole. » The transparent xylonite protractor is an excellent substitute for the brass instrument and in some... | |
| United States. Hydrographic Office - 1916 - 576 pages
...two angles observed between the three selected objects are set on the instrument, which is then moved over the chart until the three beveled edges pass...marked with a pencil point through the center hole. The transparent xylonite protractor is an excellent substitute for the brass instrument and in some... | |
| United States. Hydrographic Office - 1916 - 322 pages
...two angles observed between the three selected objects are set on the instrument, which is then moved over the chart until the three beveled edges pass...marked with a pencil point through the center hole. The transparent xylonite protractor is an excellent substitute for the brass instrument and in some... | |
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