Elements of Surveying and Leveling: With Descriptions of the Instruments, and the Necessary Tables |
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Page 109
... back station , this bearing is called the back sight , or reverse bearing . 69. The perpendicular distance between the east and west lines , drawn through the extremities of a course , is called the northing or southing , according as ...
... back station , this bearing is called the back sight , or reverse bearing . 69. The perpendicular distance between the east and west lines , drawn through the extremities of a course , is called the northing or southing , according as ...
Page 113
... back - sight , from B to A , is the angle ABH ; and since the meridians NS and HG are parallel , this angle is equal to the bearing NAB . The reverse - bearing is , therefore , S. 31 ° E. The reverse - bearing from C , is S 62 ° W ...
... back - sight , from B to A , is the angle ABH ; and since the meridians NS and HG are parallel , this angle is equal to the bearing NAB . The reverse - bearing is , therefore , S. 31 ° E. The reverse - bearing from C , is S 62 ° W ...
Page 178
... sight to the other extremity of the base - line , and mark , with the pin or ... sights are directed to the first station . If , however , in ... back to its place . Let the table be then levelled , after which , place the ...
... sight to the other extremity of the base - line , and mark , with the pin or ... sights are directed to the first station . If , however , in ... back to its place . Let the table be then levelled , after which , place the ...
Page 200
... back - sights ; and levels taken in the direc- tion of the other station , fore - sights . Before going on the field with the level , rule three columns , as below , and head them , stations , back - sights , fore - sights . FIELD NOTES ...
... back - sights ; and levels taken in the direc- tion of the other station , fore - sights . Before going on the field with the level , rule three columns , as below , and head them , stations , back - sights , fore - sights . FIELD NOTES ...
Page 201
... back - sights and fore - sights , opposite stations 3 , ( D ) , and 4 , ( E ) . It is evident from the figure , that the difference of level NF , between A and N , is equal to the back - sight bA , diminished by the fore - sight aN ...
... back - sights and fore - sights , opposite stations 3 , ( D ) , and 4 , ( E ) . It is evident from the figure , that the difference of level NF , between A and N , is equal to the back - sight bA , diminished by the fore - sight aN ...
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Common terms and phrases
adjusted Applying logarithms axis azimuth back-sight base-line bearing chord clamp-screw column compass corresponding Cosine Cosine D course curve decimal DegDeg degree of curvature degrees determined difference of level divided double meridian distance draw east error example feet field-notes fore-sight given angle given line ground hence horizontal angles horizontal distance horizontal plane inch intersection LatDeg LatDegDeg LatDegDegDegDeg latitude and departure length limb line of collimation locating M.
M. Sine M.
M. Sine D mantissa marked measured method multiplied NOTE offsets parallel passed perpendicular plane of reference plot position prismoid protractor radius reading right angles scale of equal screws secant side sights similar triangles Sine Cotang slope spider's lines stakes station subtract surface survey taken Tang tangent theodolite traverse vernier plate vertical plane yards
Popular passages
Page 56 - ... the square of the hypothenuse is equal to the sum of the squares of the other two sides.
Page 12 - The logarithm of any power of a number is equal to the logarithm of the number multiplied by the exponent of the power.
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 37 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds ; and these into thirds, etc.
Page 12 - The logarithm of a quotient is equal to the logarithm of the dividend minus the logarithm of the divisor.
Page 10 - When a number lies between 1 and 10, its logarithm lies between 0 and 1; that is, it is equal to 0, plus a decimal; if a number lies between 10...
Page 9 - 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.
Page 11 - The logarithm of the product of two numbers is equal to the sum of the logarithms of the numbers.
Page 130 - MC; hence, the double meridian distance of a course is equal to the double meridian distance of the preceding course, plus the departure of that course, plus the departure of the course itself : if .there is no preceding course, the first two terms become zero.
Page 38 - 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.