Elements of Surveying and Navigation: With Descriptions of the Instruments and the Necessary TablesA.S. Barnes & Company, 1852 - 392 páginas |
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Página viii
... Parallel Sailing , 211 SECTION V. Middle Latitude Sailing , .. 214 Mercator's Sailing , - .. 218 Mercator's Chart ,. 221 Line of Meridional Parts on Gunter's Scale , .... 222 ELEMENTS OF SURVEYING . BOOK I. SECTION I. OF LOGARITHMS viii ...
... Parallel Sailing , 211 SECTION V. Middle Latitude Sailing , .. 214 Mercator's Sailing , - .. 218 Mercator's Chart ,. 221 Line of Meridional Parts on Gunter's Scale , .... 222 ELEMENTS OF SURVEYING . BOOK I. SECTION I. OF LOGARITHMS viii ...
Página 20
... be perpendicu lar to the second . 14. An ACUTE ANGLE is an angle less than a right angle . نے 15. An OBTUSE ANGLE is an angle 16. Two straight lines are said to be parallel , greater than a right angle . 20 [ BOOK I. ELEMENTS OF SURVEYING .
... be perpendicu lar to the second . 14. An ACUTE ANGLE is an angle less than a right angle . نے 15. An OBTUSE ANGLE is an angle 16. Two straight lines are said to be parallel , greater than a right angle . 20 [ BOOK I. ELEMENTS OF SURVEYING .
Página 21
... parallel , when being situated in the same plane , they cannot meet , how far soever , either way , both of them be produced . 17. A PLANE FIGURE is a portion of a plane terminat- ed on all sides by lines , either straight or curved ...
... parallel , when being situated in the same plane , they cannot meet , how far soever , either way , both of them be produced . 17. A PLANE FIGURE is a portion of a plane terminat- ed on all sides by lines , either straight or curved ...
Página 22
... parallel . 2. The trapezoid , which has only two of its sides parallel . 3. The parallelogram , which has its 25. There are four kinds of PARALLELOGRAMS : 1. The opposite sides parallel . 22 [ BOOK I. ELEMENTS OF SURVEYING .
... parallel . 2. The trapezoid , which has only two of its sides parallel . 3. The parallelogram , which has its 25. There are four kinds of PARALLELOGRAMS : 1. The opposite sides parallel . 22 [ BOOK I. ELEMENTS OF SURVEYING .
Página 26
... parallel to AB . II . To draw through a given point a line which shall be per- pendicular to a given line . A D B 39. Let AB be the given line , and D the given point . Place the hypothenuse of the tri- angle against the edge of the ...
... parallel to AB . II . To draw through a given point a line which shall be per- pendicular to a given line . A D B 39. Let AB be the given line , and D the given point . Place the hypothenuse of the tri- angle against the edge of the ...
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Términos y frases comunes
axis back-sight base line bearing called centre column comp corresponding Cosine Cosine D Cotang 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 horizontal plane 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 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 10 - The logarithm of . the quotient of two numbers, is equal to the logarithm of the dividend diminished by the logarithm of the divisor.
Página 38 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees...
Página 61 - Being, on a horizontal plane, and wanting to ascertain the height of a tower, standing on the top of an inaccessible hill, there were measured, the angle of elevation of the top of the hill 40°, and of the top of the tower 51° ; then measuring in a direct line 180 feet farther from the hill, the angle of elevation of the top of the tower was 33° 45' ; required the height of the tower.
Página 1 - O's, to catch the eye, and to indicate that from thence the two figures of the Logarithm to be taken from the second column, stand in the next line below. N. Log. N. Log. N. Log. N. Log. 1 2 3 4 5 o.
Página 21 - ... 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...
Página 113 - Longitude of the preceding course^ plus the Departure of that course, plus the Departure of the course itself* The Double Longitude of the last course (as well as of the first) is equal to its Departure. Its "coming out" so, when obtained by the above rule, proves the accuracy of the calculation of all the preceding Double Longitudes.
Página 9 - THE LOGARITHM: of a number is the exponent of the power to which it is necessary to raise a fixed number, to produce the given number.
Página 17 - 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.
Página 39 - The secant of an arc is the line drawn from the centre of the circle through one extremity of the arc, and limited by the tangent passing through the other extremity. Thus, . 00 is the secant of the arc AB.
Página 142 - Now, if the elongation, at the time of observation, was west, and the north end of the needle is on the west side of the line, the azimuth, plus the angle shown by the needle, is the true variation. But should the north end of the needle be found on the east side of the line, the elongation being west, the difference between the azimuth and the angle would show the variation, and the reverse when the elongation is east. 1. Elongation west, azimuth 2° 04' North end of the needle on the west, angle...