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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Αποτελέσματα 1 - 5 από τα 60.
Σελίδα 48
... angle AEC , or SEZ , is double of ABC ; that is , the altitude of the sun above the horizon is double of the ... given angle will be equal to the sum of the other two ; or 180 - the sum of two given angles gives the other one . Cor . 2 ...
... angle AEC , or SEZ , is double of ABC ; that is , the altitude of the sun above the horizon is double of the ... given angle will be equal to the sum of the other two ; or 180 - the sum of two given angles gives the other one . Cor . 2 ...
Σελίδα 49
... triangle adc - dcb ; and therefore the angle a = b . Q. E. D. Cor . Hence if from any point in a perpendicular which bi- sects a given line there be drawn right lines to the extremities of the given one , they with it will form an ...
... triangle adc - dcb ; and therefore the angle a = b . Q. E. D. Cor . Hence if from any point in a perpendicular which bi- sects a given line there be drawn right lines to the extremities of the given one , they with it will form an ...
Σελίδα 50
... angle in a semicircle is a right angle , for the mea- sure of the angle ABD is half of a semicircle AED , and therefore a right angle . THEOREM VIII . PL . 1. fig . 29 . If from the centre C of a circle ABE there be let fall the ...
... angle in a semicircle is a right angle , for the mea- sure of the angle ABD is half of a semicircle AED , and therefore a right angle . THEOREM VIII . PL . 1. fig . 29 . If from the centre C of a circle ABE there be let fall the ...
Σελίδα 52
... angle BAE = DCF ( by part 3 , theo . 3 ) ; therefore the triangle ABE = CDF ( by theo . 6 ) ; let the triangle CKE ... given 52 GEOMETRICAL.
... angle BAE = DCF ( by part 3 , theo . 3 ) ; therefore the triangle ABE = CDF ( by theo . 6 ) ; let the triangle CKE ... given 52 GEOMETRICAL.
Σελίδα 53
... given to find the other ; the square root of the difference of the squares of the hypothenuse and given side will be ... angle ACB is 60 degrees , being measured by the arc AEB ; therefore the sum of the other two angles is 120 degrees ( by ...
... given to find the other ; the square root of the difference of the squares of the hypothenuse and given side will be ... angle ACB is 60 degrees , being measured by the arc AEB ; therefore the sum of the other two angles is 120 degrees ( by ...
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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.