Elements of Surveying, and Navigation: With Descriptions of the Instruments and the Necessary TablesA. S. Barnes & Company, 1854 - 322 páginas |
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Página 68
... pieces of red cloth to the heads of the marking pins , that they may be more readily found in thick grass , brushwood , & c . Great care must be taken to keep the chain horizontal , and if the slope of the ground be too great to admit ...
... pieces of red cloth to the heads of the marking pins , that they may be more readily found in thick grass , brushwood , & c . Great care must be taken to keep the chain horizontal , and if the slope of the ground be too great to admit ...
Página 85
... piece of ground having an uneven surface , we should refer the whole to a horizontal plane , and take for the measure of the area that part of the plane which is inclu- ded between the bounding hori- zontal lines AB , BC , CD , DA . D B ...
... piece of ground having an uneven surface , we should refer the whole to a horizontal plane , and take for the measure of the area that part of the plane which is inclu- ded between the bounding hori- zontal lines AB , BC , CD , DA . D B ...
Página 88
... piece of ground in the form of a square , rectangle , or parallelogram . Multiply the base by the altitude , and the product will express the area ( Geom . , Bk . IV . , Prop . IV . and V. ) 1. To find the area of the rectangular field ...
... piece of ground in the form of a square , rectangle , or parallelogram . Multiply the base by the altitude , and the product will express the area ( Geom . , Bk . IV . , Prop . IV . and V. ) 1. To find the area of the rectangular field ...
Página 89
... piece of land in the form of a triangle . FIRST METHOD . Measure either side of the triangle as BC , and from the opposite angle A let fall a perpendicular AD , and measure this perpendicular ; then , mul- tiply the base and ...
... piece of land in the form of a triangle . FIRST METHOD . Measure either side of the triangle as BC , and from the opposite angle A let fall a perpendicular AD , and measure this perpendicular ; then , mul- tiply the base and ...
Página 90
... and divide their sum by 2 : the quotient will be the logarithm of the area . 1. Find the area of a triangular piece of ground whose BY FIRST RULE . 20 45 45 30 -20 - sides are 20 , 30 , and 40 chains . 90 [ BOOK II ELEMENTS OF SURVEYING .
... and divide their sum by 2 : the quotient will be the logarithm of the area . 1. Find the area of a triangular piece of ground whose BY FIRST RULE . 20 45 45 30 -20 - sides are 20 , 30 , and 40 chains . 90 [ BOOK II ELEMENTS OF SURVEYING .
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Términos y frases comunes
axis back-sight base line bearing called centre column comp Cosine Cosine D course decimal degrees determined diff difference of latitude difference of level direction divided double meridian distance draw east error example feet figure fore-sight given angle given line given point half hence horizontal distance horizontal line hypothenuse inch instrument intersection LatDegDegDegDeg length limb line of collimation logarithm longitude M.
M. Sine marked measure method middle latitude miles multiplied paper parallel PARALLEL SAILING perpendicular plane of reference plane sailing plane triangle protractor quotient radius right angles right-angled triangle rods sailing scale of chords scale of equal screws secant sector sides sights Sine Cotang Sine D spherical excess spider's lines square chains staff station straight line subtract surface survey Tang tangent telescope theodolite trigonometrical vernier plate vertical yards
Pasajes populares
Página 14 - The logarithm of the quotient of two numbers is equal to the logarithm of the dividend minus the logarithm of the divisor.
Página 42 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees...
Página 13 - The logarithm of a number is the exponent of the power to which it is necessary to raise a fixed number, in order to produce the first number.
Página 25 - ... 20. An EQUILATERAL polygon is one which has all its sides equal; an equiangular polygon, is one which has all its angles equal. 21. Two polygons are mutually equilateral, when they have their sides equal each to each, and placed in the same order : that is to say, when following their bounding lines in the same direction, the first side of the one is equal to the first side of the other, the second to the second, the third to the third, and so on. 22. Two polygons are mutually equiangular, when...
Página 20 - The difference of the logarithms, as here used, means the algebraic difference ; so that, if the logarithm of the divisor have a negative characteristic, its sign must be changed to positive, after diminishing it by the unit, if any, carried in the subtraction from the decimal part of the logarithm.
Página 135 - Soon after the organization of the present government, several of the states ceded to the United States large tracts of wild land, and these together with the lands since acquired by treaty and purchase, constitute what is called the public lands or public domain. Previous to the year 1802 these lands were parcelled out without reference to any general plan, in consequence of which the titles often conflicted with each other, and in many cases, several grants .covered the same premises. In the year...
Página 96 - Then, find the areas of the triangles separately, and their sum will be the area of the quadrilateral.
Página 43 - The tangent of an arc is the line which touches it at one extremity, and is limited by a line drawn through the other extremity and the centre of the circle. Thus, AC is the tangent of the arc AB.
Página 28 - B + 0, the product would be indicated thus; (A+D)x(A-B+C), whatever is enclosed within the curved lines, being considered as a single quantity. The same thing may also be indicated by a bar : thus, A+B+OXD, denotes that the sum of A, B and C, is to be multiplied by D.
Página 1 - The minutes in the left.hand column of each page, increasing downwards, belong to the degrees at the top ; and those increasing upwards, in the right.hand column, belong to the degrees below.