Leveling ; Circular Curves ; Stadia and Plane-table Surveying ; Topographic Surveying ; Hydrographic Surveying ; United States Land Surveys ; Mapping ; Practical AstronomyInternational Textbook Company, 1907 |
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Términos y frases comunes
adjustment altitude Astronomy axis azimuth backsight barometer base line bearing boundary bubble called celestial sphere center line column contour contour lines correction corresponding declination deflection angle degree of curve determined diameter difference direction distance edge elevation Ephemeris equal equation EXAMPLES FOR PRACTICE feet field notes formula given height horizontal hour angle inches index error instrument intersection intervals lake latitude length level tube line of sight located longitude marked mean solar measured meridian method middle ordinate observer parallel perpendicular plane table plate platted Polaris position Practical Astronomy prismoids protractor quarter-section corner radius range line refraction represent right ascension rod reading scale screws section corner section line sextant shore shown in Fig sidereal slope sounding stadia stadia reading stake star Station surface taken tangent telescope tion topographer township transit Transit Surveying traverse trees triangle vernier vertical circle ΙΟ
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Página 1 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds ; and these into thirds, etc.
Página 2 - The Commissioner of the General Land Office, under the direction of the Secretary of the Interior, is authorized to enforce and carry into execution, by appropriate regulations, every part of the provisions of this title not otherwise specially provided for.
Página 49 - The boundary lines actually run and marked" (in the field) "shall be established as the proper boundary lines of the sections, or subdivisions, for which they were intended, and the length of such lines as returned by either of the surveyors aforesaid shall be held and considered as the true length thereof. And the boundary lines which shall not have been actually run and marked as aforesaid shall be ascertained by running straight lines from the established corners to the opposite corresponding...
Página 50 - ... sections, which may thereafter be sold, shall be ascertained, as nearly as may be, in the manner and on the principles directed and prescribed by the section preceding; and fractional sections containing...
Página 12 - The declination of a heavenly body is its angular distance north or south from the celestial equator, and is measured by the arc of the hour-circle passing through the object and intercepted between it and the equator.
Página 18 - The kind of materials of which corners are constructed. 4. Trees on line. The name, diameter, and distance on line to all trees which it intersects. 5. Intersections by line of land objects. The distance at which the line...
Página 49 - The boundaries and contents of the several sections, half sections, and quarter sections of the public lands shall be ascertained in conformity with the following principles: First.
Página 49 - ... boundary lines shall be ascertained by running from the established corners due north and south, or east and west, lines, as the case may be, to the water course, Indian boundary line, or other external boundary of such fractional township.
Página 8 - Tighten the same two screws. The instrument need not be level when the test is made. 3. To Make the Line of Sight Parallel to the Axis of the Level Tube (Two-peg Test). — Set two pegs 200 to 300 ft. apart on approximately level ground. Set up and level the instrument in a location such that the eyepiece is J^ in.
Página 15 - N. latitudes against the course of the sun, that is to say, from right to left, or in a direction contrary to the movement of the hands of a watch, and in S.