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 126
... bearing of any line with the circumferentor , that bearing will be the number of degrees the line is from the north ; consequently the north must be a like number of de- grees from the line ; and thus the north , and of course the south ...
... bearing of any line with the circumferentor , that bearing will be the number of degrees the line is from the north ; consequently the north must be a like number of de- grees from the line ; and thus the north , and of course the south ...
Página 127
... bearing of that line from the north , and the same that the circumferentor would give . After having measured the stationary distance , set up your instrument at the second station ; unscrew it , and set either end of the index to the ...
... bearing of that line from the north , and the same that the circumferentor would give . After having measured the stationary distance , set up your instrument at the second station ; unscrew it , and set either end of the index to the ...
Página 128
... bearing or angle , as the needle doth , and therefore is preferred to any instrument that is governed by the needle . THE SEMICIRCLE . THIS instrument , as its name imports , is a half - circle , divided from its diameter into 180 ...
... bearing or angle , as the needle doth , and therefore is preferred to any instrument that is governed by the needle . THE SEMICIRCLE . THIS instrument , as its name imports , is a half - circle , divided from its diameter into 180 ...
Página 132
... bearings being taken from the meridian , whether by a circumferentor , theodolite , or semicircle , and measured with a two - pole chain . No. Bearing . ch . l . 1 2831 55. 20 3483 12. 36 3 317 29. 20 4 266 55. 20 5 193 40. 00 6 124 76 ...
... bearings being taken from the meridian , whether by a circumferentor , theodolite , or semicircle , and measured with a two - pole chain . No. Bearing . ch . l . 1 2831 55. 20 3483 12. 36 3 317 29. 20 4 266 55. 20 5 193 40. 00 6 124 76 ...
Página 133
... bearing is 2831 ; turn the arc of your protractor upwards , keeping the pin in the centre- hole , move the protractor so that the parallel lines may cut opposite divisions either on the ends of the scale or on the de- grees , and then ...
... bearing is 2831 ; turn the arc of your protractor upwards , keeping the pin in the centre- hole , move the protractor so that the parallel lines may cut opposite divisions either on the ends of the scale or on the de- grees , and then ...
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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.