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" ... the fixed arm. To plot a position, the 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 respectively and simultaneously through the three objects.... "
American Practical Navigator: an Epitome of Navigation and Nautical Astronomy - Page 62
by Nathaniel Bowditch - 1920
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The American Practical Navigator: Being an Epitome of Navigation and ...

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...
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United States Coast Pilot: Atlantic Coast. Part III. From Cape Ann ..., Part 3

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...
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Scandinavia Pilot: The Naze to Christiania, thence to the Kattegat; also the ...

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...
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North Coast of France Pilot, Including the Channel Islands

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...
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North Sea Pilot (eastern Shores): From Dunkerque to the Skaw

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...
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Bay of Biscay Pilot, West Coast of France and the North Coast of Spain from ...

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...
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Bay of Bengal Pilot: Bay of Bengal and the Coasts of India and Siam ...

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...
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Africa Pilot: comprises the sailing directions of the southwest coast of ...

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...
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Red Sea and Gulf of Aden Pilot, Comprising the Suez Canal, the Gulfs of Suez ...

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...
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British Columbia Pilot: The coast of British Columbia from Cape Caution to ...

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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