Elements of Surveying: With a Description of the Instruments and the Necessary Tables, Including a Table of Natural SinesA.S. Barnes and Company, 1840 |
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Page 6
... Theodolite , 55 Heights and Distances , 66 Of Measurements with the Tape or Chain , 74 Surveying Cross , 76 CHAPTER III . Of the Content of Ground , • Of Laying Out and Dividing Land , 688 79 89 CHAPTER IV . Surveying with the Compass ...
... Theodolite , 55 Heights and Distances , 66 Of Measurements with the Tape or Chain , 74 Surveying Cross , 76 CHAPTER III . Of the Content of Ground , • Of Laying Out and Dividing Land , 688 79 89 CHAPTER IV . Surveying with the Compass ...
Page 55
... Theodolite . This instrument only will be described at present ; others will be subsequently explained . OF THE THEODOLITE . Pl . 1. The theodolite is an instrument used to measure horizontal and vertical angles . It is usually placed ...
... Theodolite . This instrument only will be described at present ; others will be subsequently explained . OF THE THEODOLITE . Pl . 1. The theodolite is an instrument used to measure horizontal and vertical angles . It is usually placed ...
Page 57
... theodolite , are two prin- the eye is placed , is called the eyeglass , cipal lenses , one at each end . The one at the end where OF THE THEODOLITE . '57.
... theodolite , are two prin- the eye is placed , is called the eyeglass , cipal lenses , one at each end . The one at the end where OF THE THEODOLITE . '57.
Page 58
... theodolite , it must be properly adjusted . The adjustment consists in bringing the different parts to their proper places . The line of collimation , is the axis of the telescope . With this axis , the line drawn through the centre of ...
... theodolite , it must be properly adjusted . The adjustment consists in bringing the different parts to their proper places . The line of collimation , is the axis of the telescope . With this axis , the line drawn through the centre of ...
Page 59
... the adjustment with tolerable accu- racy ; then , having made the second with care , let the first be again examined , and proceed thus till the adjustment is * THIRD ADJUSTMENT . To make the limb of the completed . OF THE THEODOLITE . 59.
... the adjustment with tolerable accu- racy ; then , having made the second with care , let the first be again examined , and proceed thus till the adjustment is * THIRD ADJUSTMENT . To make the limb of the completed . OF THE THEODOLITE . 59.
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Common terms and phrases
adjustment angle of elevation axis azimuth back-sights base line bearing bubble called centre clamp-screw coincide column comp Cosine Sine Cotang course curve decimal determined difference of level direction divided double meridian distance draw east error example extremity feet field notes figure find the area given line given point ground Gunter's chain Hence horizontal angle horizontal distance horizontal plane hypothenuse inches instrument intersection LatDegDegDegDeg Distance latitude and departure length levelling screws line AC line of collimation logarithm M.
M. Sine measure method multiplied object parallel passing perpendicular piece of land plane of reference PROBLEM protractor radius right angles right-angled triangle side sights similar triangles spider's lines square chains square rods subtract surface survey Tang tangent theodolite thumb-screw truly horizontal Turn the vernier upper telescope vernier plate vertical angle vertical limb yards
Popular passages
Page 20 - FRACTION is a negative number, and is one more than the number of ciphers between the decimal point and the first significant Jigure.
Page 57 - ... the square of the hypothenuse is equal to the sum of the squares of the other two sides.
Page 42 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds.
Page 7 - ... 46 46 46 46 46 46 46 46 46 46 46 46 46 45 45 45 45 45 45 45 45 45 45 45 45 45 45 45 45 45 45 45 45 45 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 43 N.
Page 36 - This is a scale of two feet in length, on the faces of which a variety of scales are marked. The face on which the divisions of inches are made, contains, however, all the scales necessary for laying down lines and angles. These are, the scale of equal parts, the diagonal scale of equal parts, and the scale of chords, all of which have been described.
Page 138 - Take a board, of about one foot square, paste white paper upon it, and perforate it through the center; the diameter of the hole being somewhat larger than the diameter of the telescope of the theodolite. Let this board be so fixed to a vertical staff" as to slide up and down freely ; and let a small piece of board, about three inches square, be nailed to the lower edge of it, for the purpose of holding a candle.
Page 42 - Mathematics which treats of the solution of plane triangles. In every plane triangle there are six parts : three sides and three angles. When three of these parts are given, one being a side, the remaining parts may be found by computation.
Page 29 - AXIOM is a self-evident truth ; such as, — 1. Things which are equal to the same thing, are equal to each other. 2. If equals be added to equals, the sums will be equal. 3. If equals be taken from equals, the remainders will be equal. 4. If equals be added to unequals, the sums will be unequal.
Page 18 - Find from the table the logarithm of the first four figures, and to it prefix a characteristic less by unity than all the places of figures in the given number. Take from the last column on the right of the page, marked D, the number on the same horizontal line with the logarithm, and multiply this number by the figures that have been considered as ciphers : then cut off from the right hand as many places for decimals as there are figures in the multiplier, and add the product so obtained to the...
Page 91 - ... 10, and the remainder will be the logarithm of double the area of the triangle. Find, from the table, the number answering to this logarithm, and divide it by 2 ; the quotient will be the required area (Geom.