Elements of Surveying: Including a Description of the Instruments and the Necessary TablesWiley & Long, 1837 - 249 Seiten |
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Seite 5
... method is simple , it has , nevertheless , been productive of great results , by defining , with mathematical precision , the boundaries of lands in the new States , and thus settling their titles on an indisputable basis . The method ...
... method is simple , it has , nevertheless , been productive of great results , by defining , with mathematical precision , the boundaries of lands in the new States , and thus settling their titles on an indisputable basis . The method ...
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Including a Description of the Instruments and the Necessary Tables Charles Davies. The method was originated by Col. Jared Mansfield , whose great acquirements in science introduced him to the notice of President Jefferson , by whom he ...
Including a Description of the Instruments and the Necessary Tables Charles Davies. The method was originated by Col. Jared Mansfield , whose great acquirements in science introduced him to the notice of President Jefferson , by whom he ...
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... Method of Plotting , 105 Second Method of Plotting , ib . Method of Surveying the Public Lands , 114 Variation of the Needle , 115 Of the Plain - Table , 121 CHAPTER V. Of Levelling , 125 Of the Level , 128 Of the Levelling Staves , 131 ...
... Method of Plotting , 105 Second Method of Plotting , ib . Method of Surveying the Public Lands , 114 Variation of the Needle , 115 Of the Plain - Table , 121 CHAPTER V. Of Levelling , 125 Of the Level , 128 Of the Levelling Staves , 131 ...
Seite 13
... method of finding the logarithms of numbers which exceed four places of figures , does not give the exact logarithm ; for , it supposes that the logarithms are propor- tional to their corresponding numbers , which is not rigorously true ...
... method of finding the logarithms of numbers which exceed four places of figures , does not give the exact logarithm ; for , it supposes that the logarithms are propor- tional to their corresponding numbers , which is not rigorously true ...
Seite 18
... method . 3.274107 2.104729 Diff . 1.169378 : By arith . comp . its ar . comp . Sum 1.169378 after 3.274107 7.895271 Hence , to perform division by means of the arithmetical subtracting 10 18 INTRODUCTION . Arithmetical Complement,
... method . 3.274107 2.104729 Diff . 1.169378 : By arith . comp . its ar . comp . Sum 1.169378 after 3.274107 7.895271 Hence , to perform division by means of the arithmetical subtracting 10 18 INTRODUCTION . Arithmetical Complement,
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Häufige Begriffe und Wortgruppen
acres adjusted angle of elevation axis azimuth back-sights base line called centre clamp-screw coincide column comp compass Cosine D Cosine Sine Cotang course curve decimal degrees determined difference of level direction divided double meridian distance draw east elongation error example extremity feet figure frustrum given angle given line given point ground Gunter's chain hence horizontal angle horizontal distance horizontal plane hypothenuse inches instrument intersection LatDegDegDegDeg latitude and departure length levelling screws line of collimation M.
M. Sine marked measure method multiplied needle object opposite station paper parallel passing perpendicular pins plain-table plane of reference protractor radius right angles right-angled triangle scale of equal secant side sights similar triangles Sine D spider's lines square chains staff subtracted surface survey Tang tangent theodolite true meridian vernier plate vertical limb yards
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Seite 32 - 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.
Seite 39 - In any triangle, the sum of the two sides containing eithei angle, is to their difference, as the tangent of half the sum of the two other angles, to the tangent of half their difference.
Seite 108 - B, from B to C, from C to D, from D to E, and from E to A ; and measure the distances AB, BC, CD, DE, and EA.
Seite 33 - 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, OC is the secant of the arc AB.
Seite 12 - 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...
Seite 32 - In every plane triangle there are six parts : three sides and three angles. These parts are so related to each other, that if a certain number of them are known or given, the remaining ones can be determined.
Seite 120 - The line so determined makes, with the true meridian, an angle equal to the azimuth of the polestar; and from this line the variation of the needle is readily determined, even without tracing the true meridian on the ground. Place the compass upon this line, turn the sights in the direction of it, and note the angle shown by the needle. 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...
Seite 82 - Multiply the half sum and the three remainders together, and extract the square root of the product. EXAMPLES. 1. What is the area of a triangle whose sides are respectively 30, 40, and 50 feet ? 30 + 40 + 50 = 120.
Seite 81 - Then, add together the logarithms of the two sides and the logarithmic sine of their included angle; from this sum subtract the logarithm of the radius, which is 10, and the remainder will be the logo.ritiim of double the area of the triangle.
Seite 159 - NB In the following table, in the last nine columns of each page, where the first or leading figures change from 9's to O's, points or dots are introduced instead of the...