Surveying Manual: A Manual of Field and Office Methods for the Use of Students in Surveying

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McGraw-Hill book Company, Incorporated, 1915 - Surveying - 388 pages
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Page 164 - That the surveyor general shall cause the townships west of the Muskingum, which, by the above-mentioned act, are directed to be sold in quarter townships, to be subdivided into half sections of three hundred and twenty acres each, as nearly as may be, by running parallel lines through the same from east to west, and from south to north...
Page 382 - The Logarithm of a number to a given base is the index of the power to which the base must be raised to give the number. Thus if m = a", x is called the logarithm of m to the base a.
Page 165 - 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 corners...
Page 170 - Quarter-quarter corners not established by the government surveyors shall be placed on the straight lines joining the section and quarter-section corners and midway between them, except on the last half mile of section lines closing on the north and west boundaries of the townships, or on other lines between fractional sections.
Page 170 - An obliterated corner is one where no visible evidence remains of the work of the original surveyor in establishing it. Its location may. however, have been preserved beyond all question by acts of landowners, and by the memory of those who knew and recollect the true situs of the original monument. In such cases it is not a lost corner. A lost corner is one whose position cannot be determined, beyond reasonable doubt, either from original marks or reliable external evidence.
Page 164 - ReviaVds'tatutes' corners of half and quarter sections not marked shall be placed as nearly as possible " equidistant from those two corners which stand on the same line." This act further provides that "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...
Page 166 - Standard Parallels. — Standard parallels, which are also called correction lines, are extended east and west from the principal meridian, at intervals of 24 miles north and south of the base line. They are surveyed like the base line.
Page 170 - That the original township, section, and quarter.section corners established by the Government surveyors must stand as the true corners which they were intended to represent, whether the corners be in place or not.
Page 147 - To make the index glass, I, perpendicular to the plane of the limb, bring the vernier to about the middle of the arc and examine the arc and its image in the index glass. If 'the glass is perpendicular to the plane of the limb, the image of the reflected and direct portions will form a continuous curve. Adjust the glass by means of the screws at the base. Horizon Glass.
Page 100 - Plate 13 the angle a represents the azimuth of the line AB. The bearing of a line is the horizontal angle which it makes with a north and south line ; it is usually expressed in a value less than 90 and, therefore, it is sometimes measured from the north point and sometimes from the south point, clockwise or counterclockwise. In Plate 13, the angle /3 represents the bearing of the line AB.

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