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 σελίδες |
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Σελίδα 121
... needle touched by a loadstone , which always retains the same situa- tion ; that is , it always points to the north and south points of the horizon nearly , when the instrument is horizontal , and the needle at rest . The box is covered ...
... needle touched by a loadstone , which always retains the same situa- tion ; that is , it always points to the north and south points of the horizon nearly , when the instrument is horizontal , and the needle at rest . The box is covered ...
Σελίδα 122
... needles are better than those which are pointed at each end , because the surveyor cannot mistake by counting to a wrong end , which error may be frequently com- mitted in using a two - pointed needle . Two - pointed needles have ...
... needles are better than those which are pointed at each end , because the surveyor cannot mistake by counting to a wrong end , which error may be frequently com- mitted in using a two - pointed needle . Two - pointed needles have ...
Σελίδα 123
... needle . Again , from B observe an object at C , with the north of the box to your eye , and set down the de- gree cut by the south point of the needle , so have you the bear- ings of the lines AB and BC ; you may then set up your in ...
... needle . Again , from B observe an object at C , with the north of the box to your eye , and set down the de- gree cut by the south point of the needle , so have you the bear- ings of the lines AB and BC ; you may then set up your in ...
Σελίδα 124
... needle ; or you may turn the south of the box to your eye , and count your degrees to the south end of the needle . The brass ring in the box is divided on the side into 360 de- grees , thus : from the north to the east into 90 , from ...
... needle ; or you may turn the south of the box to your eye , and count your degrees to the south end of the needle . The brass ring in the box is divided on the side into 360 de- grees , thus : from the north to the east into 90 , from ...
Σελίδα 125
... 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 needle , which sup- pose are 172 ° . Then 250 ° 172 ° 68 ° the GAB ; but if ...
... 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 needle , which sup- pose are 172 ° . Then 250 ° 172 ° 68 ° the GAB ; but if ...
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Συχνά εμφανιζόμενοι όροι και φράσεις
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
Δημοφιλή αποσπάσματα
Σελίδα 173 - In like manner, when it is said, that " triangles on the same base, and between the same parallels, are equal...
Σελίδα 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.
Σελίδα 163 - RULE. From half the sum of the three sides subtract each side severally.
Σελίδα 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.
Σελίδα 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.
Σελίδα 41 - The radius of a circle is a right line drawn from the centre to the circumference.
Σελίδα 52 - Triangles upon equal bases, and between the same parallels, are equal to one another.
Σελίδα 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.
Σελίδα 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.