Elements of Surveying and Leveling: With Descriptions of the Instruments, and the Necessary Tables |
From inside the book
Results 1-5 of 28
Page 74
... READINGS . 26. The true reading of an instrument , for any position of the vernier , expresses the distance from the point where the graduation on the limb begins , marked 0 , to the 0 point of the vernier . In the diagram , that ...
... READINGS . 26. The true reading of an instrument , for any position of the vernier , expresses the distance from the point where the graduation on the limb begins , marked 0 , to the 0 point of the vernier . In the diagram , that ...
Page 75
... reading on the vernier : the sum of these two readings is the reading of the instrument . 1 In the theodolite described , the limb is divided into half- degrees , and 30 spaces on the vernier cover 29 spaces on the limb . Hence , the ...
... reading on the vernier : the sum of these two readings is the reading of the instrument . 1 In the theodolite described , the limb is divided into half- degrees , and 30 spaces on the vernier cover 29 spaces on the limb . Hence , the ...
Page 76
... readings will be the true angle , unless the 0 point of the vernier shall have passed the 0 point of the limb , in which case the greater reading must be subtracted from 360 ° , and the remainder added to the less . MEASUREMENT OF ...
... readings will be the true angle , unless the 0 point of the vernier shall have passed the 0 point of the limb , in which case the greater reading must be subtracted from 360 ° , and the remainder added to the less . MEASUREMENT OF ...
Page 77
... readings , may be obtained by subtracting half the difference from the first reading . If the first reading is less than the second , the half difference must be added to the first . Hence , To find the index error , take the reading of ...
... readings , may be obtained by subtracting half the difference from the first reading . If the first reading is less than the second , the half difference must be added to the first . Hence , To find the index error , take the reading of ...
Page 112
... reading . WORK ON THE FIELD . 75. When a piece of ground is to be surveyed , we begin at some prominent corner of the field , and go entirely around the land , measuring the lengths of the bounding lines with the chain , and taking ...
... reading . WORK ON THE FIELD . 75. When a piece of ground is to be surveyed , we begin at some prominent corner of the field , and go entirely around the land , measuring the lengths of the bounding lines with the chain , and taking ...
Other editions - View all
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.