 | 1916 - 188 Seiten
...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...marked with a pencil point through the center hole. The tracing-paper protractor, consisting of a graduated circle printed on tracing paper, can be used as... | |
 | U.S. Coast and Geodetic Survey - 1916 - 318 Seiten
...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...marked with a pencil point through the center hole. The value of a determination depends greatly on the relative positions of the objects observed. If the... | |
 | United States. Hydrographic Office - 1917 - 606 Seiten
...be used for direction, because less affected by a small error or change of position. The three -arm protractor or station pointer consists of a graduated...some cases preferable to it, as when, for instance, theobjecls angled on are so near the observer that they are more or less hidden by the circle of the... | |
 | 1926 - 260 Seiten
...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...instrument will then mark the ship's position, which may be picked on the chart or marked with a pencil point through the center hole. The tracing-paper protractor,... | |
 | Nathaniel Bowditch - 1931 - 866 Seiten
...station-pointer (see art. 428, Chap. XVII). Set the right and left angles on the instrument, and then move it over the chart until the three beveled edges pass...marked with a pencil point through the center hole. When the three-armed protractor is not at hand, the tracing-paper protractor will prove an excellent... | |
 | U.S. Coast and Geodetic Survey - 1938 - 504 Seiten
...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 ship.s position, which may be pricked on the chart or marked with a pencil point through the center... | |
 | U.S. Coast and Geodetic Survey - 1940 - 558 Seiten
...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 ship.s position, which may be pricked on the chart or marked with a pencil point through the center... | |
 | 1936 - 374 Seiten
...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...marked with a pencil point through the center hole. The tracing-paper protractor, consisting of a graduated circle printed on tracing paper, can be used as... | |
 | 1923 - 116 Seiten
...case of a metal instrument, or the radial lines in the case of a transparent or cefluloid instrument, pass respectively and simultaneously through the three...marked with a pencil point through the center hole. The tracingpaper protractor, consisting of a graduated circle printed on tracing paper, can be used as... | |
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The three-arm protractor or station pointer consists of a graduated brass circle with one fixed and two movable radial arms, the three beveled edges of the arms, if produced, intersecting at the exact center of the instrument. The edge of the fixed arm... 
