A Treatise on Practical Surveying: Which is Demonstrated from Its First Principles. Wherein Everything that is Useful and Curious in that Art, is Fully Considered and ExplainedF. Lucas and Joseph Cushing, 1818 - 478 σελίδες |
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Σελίδα 83
... direct proportion given , to find a fourth . From the sum of the logarithms of the second and third numbers ; deduct the logarithm of the first , the remainder will be the logarithm of the fourth required . EXAMPLE I. Let the three ...
... direct proportion given , to find a fourth . From the sum of the logarithms of the second and third numbers ; deduct the logarithm of the first , the remainder will be the logarithm of the fourth required . EXAMPLE I. Let the three ...
Σελίδα 100
... first and third terms in the foregoing propor- tions , being of a like nature , and those of the second portions being direct ones , it follows , that if and fourth being also like to each other ; and the pro- 100 PLANE TRIGONOMETRŸ .
... first and third terms in the foregoing propor- tions , being of a like nature , and those of the second portions being direct ones , it follows , that if and fourth being also like to each other ; and the pro- 100 PLANE TRIGONOMETRŸ .
Σελίδα 101
... direct ones , it follows , that if the third term be greater or less than the first , the fourth term will be also greater or less than the second ; therefore the extent in your compasses , from the first to the third term , will reach ...
... direct ones , it follows , that if the third term be greater or less than the first , the fourth term will be also greater or less than the second ; therefore the extent in your compasses , from the first to the third term , will reach ...
Σελίδα 141
... direct distance asunder , BC , is inaccessible ; however it is known that a house at A , is 252 perches from B , and 230 from C ; and that the angle BAC , is 70 ° . What is the distance BC , between the two houses ? This is performed by ...
... direct distance asunder , BC , is inaccessible ; however it is known that a house at A , is 252 perches from B , and 230 from C ; and that the angle BAC , is 70 ° . What is the distance BC , between the two houses ? This is performed by ...
Σελίδα 151
... direct the horizontal posi- tion near enough , but if greater accuracy were requir- ed , a quadrant applied to the chain , would settle that . In the same manner the rest may be chained up and down ; but in going down it is plain the ...
... direct the horizontal posi- tion near enough , but if greater accuracy were requir- ed , a quadrant applied to the chain , would settle that . In the same manner the rest may be chained up and down ; but in going down it is plain the ...
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Συχνά εμφανιζόμενοι όροι και φράσεις
40 perches ABCD acres altitude Answer base bearing blank line centre chains and links chord circle circumferentor Co-secant Secant Co-sine Co-tang column compass complement contained cyphers decimal decimal fraction Dep Lat difference Dist divided divisor draw east edge EXAMPLE feet field-book figures four-pole chains half the sum height Hence hypothenuse inches instrument Lat Dep latitude length logarithm measure meridian distance multiplied needle number of degrees object off-sets parallel parallelogram perpendicular piece of ground plane pole polygon Portmarnock PROB proportion protractor quotient radius right angles right line scale of equal SCHOLIUM second station sect semicircle side sights sine square root stationary distance stationary line sun's suppose survey taken Tang thence theo theodolite THEOREM thro triangle ABC trigonometry true azimuth two-pole chains vane variation
Δημοφιλή αποσπάσματα
Σελίδα 42 - 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 99 - ... on a side, denotes its length to be given in feet, yards, perches, or miles, &c. and this mark", either in an angle or on a side, denotes the angle or side to be required. ; From these proportions it may be observed ; that to find a side, when the angles and one side are given, any side may be made the radius; and to find an angle, one of the given sides must be made the radius. So that in the 1st, 2d, and 3d cases, any side as well required as given may be made the radius, and in the first statings...
Σελίδα 46 - Triangles upon equal bases, and between the same parallels, are equal to one another.
Σελίδα 93 - 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 114 - 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 4 - POMEROY, of the said District, hath deposited in this Office the title of a Book, the right whereof he claims as Proprietor, in the words following, to wit : . . "Biography of the Signers to the Declaration of Independence.
Σελίδα 48 - The hypothenuse of a right-angled triangle may be found by having the other two sides ; thus, the square root of the sum of the squares of the base and perpendicular, will be the hypothenuse. Cor. 2. Having the hypothenuse and one side given to find the other; the square root of the difference of the squares of the hypothenuse and given side will be the required side.
Σελίδα 115 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.
Σελίδα 175 - ... the two cardinal points of your compass the point of the needle lies between (the north, south, east, and west being called the four cardinal points, and are graved on the bottom of the box), putting down those points together by their initial letters, and thereto annexing the number of degrees, counting from the north or south, as before, thus ; if the point of your needle lies between the north and east, north and west, south and east, or south and west points in the bottom of the box, then...
Σελίδα 282 - But if one corner cannot be seen from the other, run the line according to the given bearing, and observe the nearest distance between the line so run and the corner: then...