Elements of Surveying and Navigation: With Descriptions of the Instruments and the Necessary Tables |
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Page 12
... marked 0 , are to be prefixed . If the four figures already found stand opposite a row of six figures in the column marked 0 , the two left hand figures of the six , are the two to be prefixed ; but if they stand opposite a row of only ...
... marked 0 , are to be prefixed . If the four figures already found stand opposite a row of six figures in the column marked 0 , the two left hand figures of the six , are the two to be prefixed ; but if they stand opposite a row of only ...
Page 14
... marked D , continuing the division as long as desirable : annex the quotient to the number set aside . Point off , from the left hand , as many integer figures as there are units in the characteristic of the given logarithm increased by ...
... marked D , continuing the division as long as desirable : annex the quotient to the number set aside . Point off , from the left hand , as many integer figures as there are units in the characteristic of the given logarithm increased by ...
Page 27
... marked 1 , 2 , 3 , & c . The unit of scales of equal parts , is , in general , either an inch , or an exact part of an inch . If , for example , ab , the unit of the scale , were half an inch , the scale would be one of 10 parts to half ...
... marked 1 , 2 , 3 , & c . The unit of scales of equal parts , is , in general , either an inch , or an exact part of an inch . If , for example , ab , the unit of the scale , were half an inch , the scale would be one of 10 parts to half ...
Page 29
... marked 60 is always equal to the radius of the circle . A scale of chords is generally laid down on the scales which belong to cases of mathematical instruments , and is marked CHO . To lay off , at a given point of a line , with the ...
... marked 60 is always equal to the radius of the circle . A scale of chords is generally laid down on the scales which belong to cases of mathematical instruments , and is marked CHO . To lay off , at a given point of a line , with the ...
Page 30
... marked and the angular point : this line will make with the given line the required angle . SECTORAL SCALE OF EQUAL PARTS . 100 110 120 130 140 150 160 170 180 190 20 30 100 30 40 50 60 70 30 20 100 110 46. The sector is an instrument ...
... marked and the angular point : this line will make with the given line the required angle . SECTORAL SCALE OF EQUAL PARTS . 100 110 120 130 140 150 160 170 180 190 20 30 100 30 40 50 60 70 30 20 100 110 46. The sector is an instrument ...
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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...