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 120
... turn the chain over to D , so as to complete a parallelogram ; by reckoning off the same number of links you had in BC , from E to D , and pulling each part straight . THE CIRCUMFERENTOR . THIS instrument is composed of a brass 120 OF ...
... turn the chain over to D , so as to complete a parallelogram ; by reckoning off the same number of links you had in BC , from E to D , and pulling each part straight . THE CIRCUMFERENTOR . THIS instrument is composed of a brass 120 OF ...
Página 121
... turning the box so that the ends of the needle may be equidistant from its bottom , and it traverses or plays freely ) turn the flower - de - luce , or north part of the box , to your eye , and looking through the small aperture turn ...
... turning the box so that the ends of the needle may be equidistant from its bottom , and it traverses or plays freely ) turn the flower - de - luce , or north part of the box , to your eye , and looking through the small aperture turn ...
Página 123
... turn the south part of the box next your eye , and having cut your object at A , reckon the degrees to the south point of the needle , which will be the same as if they were taken from the object to the instrument , the direction of the ...
... turn the south part of the box next your eye , and having cut your object at A , reckon the degrees to the south point of the needle , which will be the same as if they were taken from the object to the instrument , the direction of the ...
Página 124
... turn the north part of the box to your eye , and count your degrees to the south part of the needle , as before ; or you may turn the south of the box to your eye , and count your de- grees to the north end of the needle . But in back ...
... turn the north part of the box to your eye , and count your degrees to the south part of the needle , as before ; or you may turn the south of the box to your eye , and count your de- grees to the north end of the needle . But in back ...
Página 125
... turn the whole about with the 360 from you ; direct the sights from A to G , and screw the instrument fast ; direct them from A to cut the object at B ; the degree then cut by that end of the index which is opposite you will be the ...
... turn the whole about with the 360 from you ; direct the sights from A to G , and screw the instrument fast ; direct them from A to cut the object at B ; the degree then cut by that end of the index which is opposite you will be 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.