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 121
... sights which are screwed to the index and stand perpendicular thereto in each sight is a large and a small aperture or slit , one over the other ; but these are changed , that is , if the large aperture be uppermost in the one sight ...
... sights which are screwed to the index and stand perpendicular thereto in each sight is a large and a small aperture or slit , one over the other ; but these are changed , that is , if the large aperture be uppermost in the one sight ...
Página 122
... sights directed to the object at C , and the north of the box next your eye , count your degrees to the south end of the needle , which register in your field - book in the sec- ond column opposite to station No. 2 ; then measure the ...
... sights directed to the object at C , and the north of the box next your eye , count your degrees to the south end of the needle , which register in your field - book in the sec- ond column opposite to station No. 2 ; then measure the ...
Página 123
... sights , will be able to go over nearly double the ground he could in the same time by taking fore - sights , because of overseeing the chaining ; for should he take back - sights he must be obliged , after taking his degree , to go ...
... sights , will be able to go over nearly double the ground he could in the same time by taking fore - sights , because of overseeing the chaining ; for should he take back - sights he must be obliged , after taking his degree , to go ...
Página 124
... sights you may turn the north of the box to your eye , and count your degrees to the north point of the needle ; or ... sights to the object , whether fore or back , as before , observe the two cardinal points of your compass the point ...
... sights you may turn the north of the box to your eye , and count your degrees to the north point of the needle ; or ... sights to the object , whether fore or back , as before , observe the two cardinal points of your compass the point ...
Página 125
... sights to B , and observe what degrees are cut by the south end of the needle , which let be 250 ° ; then turning the instrument about on its stand , direct the sights to G , note again what degrees are cut by the south end of the ...
... sights to B , and observe what degrees are cut by the south end of the needle , which let be 250 ° ; then turning the instrument about on its stand , direct the sights to G , note again what degrees are cut by the south end of the ...
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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.