Elements of Surveying and Leveling: With Descriptions of the Instruments, and the Necessary Tables |
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Page 62
... position : the exact aligning should be left , however , to the hind - chainman . When the distance is more than ten chains , the pins , when exhausted , should be returned to the fore - chainman - the dis- tance noted - and the ...
... position : the exact aligning should be left , however , to the hind - chainman . When the distance is more than ten chains , the pins , when exhausted , should be returned to the fore - chainman - the dis- tance noted - and the ...
Page 68
... position ; and in both situations , the telescope can be revolved in the Y's about its axis . In the telescopes attached to the theodolite , are two prin- cipal lenses , one at each end . The one at the end where the eye is placed , is ...
... position ; and in both situations , the telescope can be revolved in the Y's about its axis . In the telescopes attached to the theodolite , are two prin- cipal lenses , one at each end . The one at the end where the eye is placed , is ...
Page 69
... position , the horizontal hair appears above or below the point ; and in either case , loosen one , and tighten the other , of the two screws that work the horizontal hair , till the horizontal hair has been carried over half the space ...
... position , the horizontal hair appears above or below the point ; and in either case , loosen one , and tighten the other , of the two screws that work the horizontal hair , till the horizontal hair has been carried over half the space ...
Page 70
... position . Reverse the telescope in the Y's , and make the same correction again ; and so on , until the bubble stands in the middle of the tube , in both positions of the telescope : the axis of the level is then horizontal . Let the ...
... position . Reverse the telescope in the Y's , and make the same correction again ; and so on , until the bubble stands in the middle of the tube , in both positions of the telescope : the axis of the level is then horizontal . Let the ...
Page 71
... position of the telescope , when the telescope is reversed , the bubble would not stand in the middle of the tube , except in one position of the level . This suggests the necessity of making the first part of the adjustment with ...
... position of the telescope , when the telescope is reversed , the bubble would not stand in the middle of the tube , except in one position of the level . This suggests the necessity of making the first part of the adjustment with ...
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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.