Elements of Surveying and Navigation: With Descriptions of the Instruments and the Necessary Tables |
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Page ii
... Drawing , Architecture , Mensuration , and Logarithms , with Applications to the Mechanic Arts . Davies ' Bourdon's Algebra - Including STURM'S THEOREM - Being an abridg- ment of the Work of M. BOURDON , with the addition of practical ...
... Drawing , Architecture , Mensuration , and Logarithms , with Applications to the Mechanic Arts . Davies ' Bourdon's Algebra - Including STURM'S THEOREM - Being an abridg- ment of the Work of M. BOURDON , with the addition of practical ...
Page 25
... drawing . It consists of two legs ba , bc , which may be easily turned around a joint at b . One of the principal uses of this instrument is to lay off on a line , a distance equal to a given line . For example , to lay off on CD a ...
... drawing . It consists of two legs ba , bc , which may be easily turned around a joint at b . One of the principal uses of this instrument is to lay off on a line , a distance equal to a given line . For example , to lay off on CD a ...
Page 26
... draw through a given point a line which shall be paral- lel to a given line . 38. Let be the given point , and AB the given line . Place the hypothenuse of the tri- angle against the edge of the ruler , and then place the ruler and ...
... draw through a given point a line which shall be paral- lel to a given line . 38. Let be the given point , and AB the given line . Place the hypothenuse of the tri- angle against the edge of the ruler , and then place the ruler and ...
Page 27
... Draw af unit of the scale , which may be one inch , inch , in length . On ab describe the square abcd . the sides ab and de each into ten equal parts . and the other nine parallels as in the figure . Produce ba to the left , and lay off ...
... Draw af unit of the scale , which may be one inch , inch , in length . On ab describe the square abcd . the sides ab and de each into ten equal parts . and the other nine parallels as in the figure . Produce ba to the left , and lay off ...
Page 28
... draw parallels to ab , as in the figure . Now , the small divisions of the line ab are each one- tenth ( .1 ) of ab ; they are therefore .1 of ad , or .1 of ag or gh . If we consider the triangle adf , we see that the base df is one ...
... draw parallels to ab , as in the figure . Now , the small divisions of the line ab are each one- tenth ( .1 ) of ab ; they are therefore .1 of ad , or .1 of ag or gh . If we consider the triangle adf , we see that the base df is one ...
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Common terms and phrases
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
Popular passages
Page 10 - The logarithm of . the quotient of two numbers, is equal to the logarithm of the dividend diminished by the logarithm of the divisor.
Page 38 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees...
Page 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.
Page 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.
Page 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...
Page 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.
Page 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.
Page 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.
Page 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.
Page 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...