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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Σελίδα
... Altitude of the Sun. Section the fourth shows how to find the Variation of the Compass , with a description of the Azimuth Compass , and its use . In this Edition is introduced a new set of accurate Mathe- matical Tables . Truth calls ...
... Altitude of the Sun. Section the fourth shows how to find the Variation of the Compass , with a description of the Azimuth Compass , and its use . In this Edition is introduced a new set of accurate Mathe- matical Tables . Truth calls ...
Σελίδα
... . Method of survey- ing by Intersec- tions 282 Semidiameter of the Sun ibid . Transit of Pole Star 176 Difference of , Altitude of 289 Pole Star and Pole 177 6.Changing the scale of Maps Sun's Declination 178 295 Reduction Table 182.
... . Method of survey- ing by Intersec- tions 282 Semidiameter of the Sun ibid . Transit of Pole Star 176 Difference of , Altitude of 289 Pole Star and Pole 177 6.Changing the scale of Maps Sun's Declination 178 295 Reduction Table 182.
Σελίδα 55
... altitude of the sun above the horizon is double of the inclination of the two mirrors . But the glass at C remaining fixed , the mirror at A is attached to a moveable index , which marks their inclination . The same instrument , in its ...
... altitude of the sun above the horizon is double of the inclination of the two mirrors . But the glass at C remaining fixed , the mirror at A is attached to a moveable index , which marks their inclination . The same instrument , in its ...
Σελίδα 64
... altitude , have the same proportion between themselves as their bases BA and BD . Let any aliquot part of AB be taken , which will also measure BD : suppose that to be Ag , which will be contained twice in AB , and three times in BD ...
... altitude , have the same proportion between themselves as their bases BA and BD . Let any aliquot part of AB be taken , which will also measure BD : suppose that to be Ag , which will be contained twice in AB , and three times in BD ...
Σελίδα 65
... altitudes CG and FH Let BI be perpendicular to AB and equal to CG , in which let KB = FH , and let AI and AK be drawn . The triangle AIB = ACB ( by cor . to theo . 13. ) and AKB = DEF ; but ( by theo . 18. ) BI : BK :: ABI : ABK . That ...
... altitudes CG and FH Let BI be perpendicular to AB and equal to CG , in which let KB = FH , and let AI and AK be drawn . The triangle AIB = ACB ( by cor . to theo . 13. ) and AKB = DEF ; but ( by theo . 18. ) BI : BK :: ABI : ABK . That ...
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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.