The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skillful Practice of this ArtE. Duyckinck, 1821 - 544 σελίδες |
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Αποτελέσματα 6 - 10 από τα 77.
Σελίδα 72
... given point A , in a right line EF , to erect a perpendicular . From the ... angle , ( by def . 10. ) PROB . VI . PL . 2. fig . 12 . To raise a ... angle EBC will be a right angle ( by cor . 5. theo . 7. ) PROB . VII PL . 2. fig . 13 . 72 ...
... given point A , in a right line EF , to erect a perpendicular . From the ... angle , ( by def . 10. ) PROB . VI . PL . 2. fig . 12 . To raise a ... angle EBC will be a right angle ( by cor . 5. theo . 7. ) PROB . VII PL . 2. fig . 13 . 72 ...
Σελίδα 73
... given point A , to let fall a perpendicular upon a given right line BC . From any point D , in the given line , take ... angle ADF = FDE , DA = DE , being radii of the same circle , and DF common ; therefore ( by theo . 6. ) the an- gle DFA ...
... given point A , to let fall a perpendicular upon a given right line BC . From any point D , in the given line , take ... angle ADF = FDE , DA = DE , being radii of the same circle , and DF common ; therefore ( by theo . 6. ) the an- gle DFA ...
Σελίδα 74
... angles are right . For B being right , D is also right , and DAC , DCA ... given . PROB . X. PL . 2. fig . 15 . To divide a given right line AB into any proposed number of equal parts . Draw the indefinite right line AP , making any angle ...
... angles are right . For B being right , D is also right , and DAC , DCA ... given . PROB . X. PL . 2. fig . 15 . To divide a given right line AB into any proposed number of equal parts . Draw the indefinite right line AP , making any angle ...
Σελίδα 75
... given to find a fourth proportional . Having made an angle DEF anywise , by two indefinite blank right lines ED , EF , as before ; lay the line A , from E to G ; the line B , from E to I ; and draw the line IG ; lay the line C , from E ...
... given to find a fourth proportional . Having made an angle DEF anywise , by two indefinite blank right lines ED , EF , as before ; lay the line A , from E to G ; the line B , from E to I ; and draw the line IG ; lay the line C , from E ...
Σελίδα 76
... given to find a mean proportional . Draw an indefinite straight line , on which place ABA , and BC = B ; bisect AC ... angle ADC is a right angle ( by cor . 5. theo . 7. ) being an angle in a semicircle . The angles ABD , DBC , are right ...
... given to find a mean proportional . Draw an indefinite straight line , on which place ABA , and BC = B ; bisect AC ... angle ADC is a right angle ( by cor . 5. theo . 7. ) being an angle in a semicircle . The angles ABD , DBC , are right ...
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ABCD acres altitude Answer arch base bearing centre chains and links circle circumferentor Co-sec Co-tang column compasses contained cube root decimal diagonal difference of latitude Dist 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 Logarithms measure meridian distance multiplied Natural Co-sines natural number natural sine Nonius number of degrees object observed off-sets opposite parallelogram perches perpendicular plane pole PROB proportional protractor Quadrant quotient radius rhombus right angles right line screw Secant sect semicircle side square root station subtract survey taken tance Tang tangent theo theodolite trapezium triangle ABC trigonometry two-pole chains vane versed sine vulgar fraction whence
Δημοφιλή αποσπάσματα
Σελίδα 246 - ... that triangles on the same base and between the same parallels are equal...
Σελίδα 58 - 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 231 - RULE. From half the sum of the three sides subtract each side severally.
Σελίδα 45 - 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 14 - Then multiply the second and third terms together, and divide the product by the first term: the quotient will be the fourth term, or answer.
Σελίδα 5 - His method is founded on these three considerations: 1st, that the sum of the logarithms of any two numbers is the logarithm of the product of...
Σελίδα 91 - ... scale. Given the length of the sine, tangent, or secant of any degrees, to find the length of the radius to that sine, tangent, or secant.
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.
Σελίδα 30 - Then, because the sum of the logarithms of numbers, gives the logarithm of their product ; and the difference of the logarithms, gives the logarithm of the quotient of the numbers ; from the above two logarithms, and the logarithm of 10, which is 1, we may obtain a great many logarithms, as in the following examples : EXAMPLE 3.
Σελίδα 211 - At 170 feet distance from the bottom of a tower, the angle of its elevation was found to be 52° 30' : required the altitude of the tower ? Ans.