The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this Art. With a New Set of Accurate Mathematical TablesHarper, 1832 - 348 páginas |
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Página 138
... the base or hori zontal line , will give the height of the object above that line , to which add the height of the observer's eye above the horizon , and you have the true height . if he were at the foot of it ; DC 138 OF HEIGHTS .
... the base or hori zontal line , will give the height of the object above that line , to which add the height of the observer's eye above the horizon , and you have the true height . if he were at the foot of it ; DC 138 OF HEIGHTS .
Página 175
... true place of the extended line . Lay then the fiducial edge of the scale from b to D , and take a distance from C that will just touch the edge of the scale ; carry that distance along the edge till the point which was in C cuts the ...
... true place of the extended line . Lay then the fiducial edge of the scale from b to D , and take a distance from C that will just touch the edge of the scale ; carry that distance along the edge till the point which was in C cuts the ...
Página 176
... true contents of a survey , though it be taken by a chain that is too long or too short . Let the map be constructed , and its area found , as if the chain were of the true length . And it will be , As the square of the true chain Is to ...
... true contents of a survey , though it be taken by a chain that is too long or too short . Let the map be constructed , and its area found , as if the chain were of the true length . And it will be , As the square of the true chain Is to ...
Página 182
... true when the surveyor keeps the land he surveys on his right - hand , which we suppose through the whole to be done ; but if he goes the contrary way , call the southings northings and the northings southings , and the same rule will ...
... true when the surveyor keeps the land he surveys on his right - hand , which we suppose through the whole to be done ; but if he goes the contrary way , call the southings northings and the northings southings , and the same rule will ...
Página 192
... true boundary AB'C " D " " A would be obtained . If we suppose the lines BB'CC " DD " " , & c . to be parallel to AE , it would satisfy the second , third , fourth , and fifth of the preceding principles . For the change of position of ...
... true boundary AB'C " D " " A would be obtained . If we suppose the lines BB'CC " DD " " , & c . to be parallel to AE , it would satisfy the second , third , fourth , and fifth of the preceding principles . For the change of position of ...
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Términos y frases comunes
ABCD acres altitude arch azimuth base bearing blank line centre chains and links circle circumferentor co-sine column compasses contained cube root decimal diagonal diameter difference of latitude divided divisions divisor draw east ecliptic edge EXAMPLE feet field-book figure four-pole chains geometrical series given angle given number half the sum height Hence horizon glass hypothenuse inches instrument length logarithm manner measure meridian distance method multiplied needle nonius number of degrees object observed offsets opposite parallelogram perches perpendicular plane prob PROBLEM proportion protractor quadrant quotient radius rhombus right angles right line scale of equal SCHOLIUM screw secant sect sector semicircle side square root station stationary distance subtract suppose survey taken tangent theo theodolite THEOREM third trapezium triangle ABC trigonometry two-pole chains vane vulgar fraction whence
Pasajes populares
Página 173 - In like manner, when it is said, that " triangles on the same base, and between the same parallels, are equal...
Página 49 - The angle in a semicircle is a right angle ; the angle in a segment greater than a semicircle is less than a right angle ; and the angle in a segment less than a semicircle is greater than a right angle.
Página 163 - RULE. From half the sum of the three sides subtract each side severally.
Página 41 - 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, &c.
Página 97 - C' (89) (90) (91) (92) (93) 112. In any plane triangle, the sum of any two sides is to their difference as the tangent of half the sum of the opposite angles is to the tangent of half their difference.
Página 41 - The radius of a circle is a right line drawn from the centre to the circumference.
Página 52 - Triangles upon equal bases, and between the same parallels, are equal to one another.
Página 24 - The square of the sum of two numbers is equal to the square of the first number plus twice the product of the first and second number plus the square of the second number.
Página 35 - DIVISION BY LOGARITHMS. RULE. From the logarithm of the dividend subtract the logarithm of the divisor, and the number answering to the remainder will be the quotient required.