A Treatise of Practical Surveying, ...1808 - 440 sider |
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Side 111
... Turn the centre A of the quadrant , next your eye , and look along the side AC , or 90 side , to the top and bottom of the object ; and noting down the angles , measure the distance from the place of observation to the foot of the ...
... Turn the centre A of the quadrant , next your eye , and look along the side AC , or 90 side , to the top and bottom of the object ; and noting down the angles , measure the distance from the place of observation to the foot of the ...
Side 147
... turn the chain over to D , so as to complete a parallelogram ; by reckoning off the same number of links you had in BC , from E to D , and pulling each part straight . OF OF THE CIRCUMFERENTOR . TH HIS instrument is composed of OF THE ...
... turn the chain over to D , so as to complete a parallelogram ; by reckoning off the same number of links you had in BC , from E to D , and pulling each part straight . OF OF THE CIRCUMFERENTOR . TH HIS instrument is composed of OF THE ...
Side 149
... turning the box so , that the ends of the needle may be equi- distant from its bottom , and it traverses or plays freely ) turn the flower - de - luce or north part of the box to your eye , and looking through the small aperture , turn ...
... turning the box so , that the ends of the needle may be equi- distant from its bottom , and it traverses or plays freely ) turn the flower - de - luce or north part of the box to your eye , and looking through the small aperture , turn ...
Side 151
... turn the south part of the box next your eye , and having cut your object at A , reckon the degrees to the south point of the needle , which will be the same as if they were taken from the ob- ject to the instrument , the direction of ...
... turn the south part of the box next your eye , and having cut your object at A , reckon the degrees to the south point of the needle , which will be the same as if they were taken from the ob- ject to the instrument , the direction of ...
Side 153
... turn the north part of the box to your eye , and count your degrees to the south part of the needle , as before ; or you may turn the south of the box to your eye , and count your degrees to the north end of the needle . But in back ...
... turn the north part of the box to your eye , and count your degrees to the south part of the needle , as before ; or you may turn the south of the box to your eye , and count your degrees to the north end of the needle . But in back ...
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Vanlige uttrykk og setninger
40 perches ABCD acres altitude Answer base bearing blank line centre chains and links chord circle circumferentor Co-fecant Secant Co-fine Co-tang column contained cyphers decimal decimal fraction diameter difference Dift Diſt distance line divided draw drawn east edge EXAMPLE feet field-book figures fore four-pole chains half the sum height hypothenuse inches instrument latitude logarithm measure meridian distance method multiplied needle number of degrees object off-sets parallel parallelogram perpendicular piece of ground plane Plate pole Portmarnock PROB protractor quotient radius right angles right line scale of equal second station sect semicircle side sights sine square root stationary distance stationary line sun's survey taken tangent thence theo theodolite thro trapezium triangle ABC trigonometry true amplitude two-pole chains vane variation Vulgar Fraction whence ΙΟ
Populære avsnitt
Side 32 - 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.
Side 199 - ... that triangles on the same base and between the same parallels are equal...
Side 94 - 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.
Side 23 - Four quantities are said to be in proportion when the product of the extremes is equal to that of the means : thus if A multiplied by D, be equal to B multiplied by C, then A is said to be to B as C is to D.
Side 95 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.
Side 37 - ABDE+ACGF the sum of the squares —BKLH-\-KCML, the sum of the two parallelograms or square BCMH; therefore the sum of the squares on AB and AC is equal to the square on BC.
Side 24 - Things that are equal to one and the same thing, are equal to each other. 2. Every whole is greater than its part. % 3. Every whole is equal to all its parts taken together. 4 If to equal things, equal things be added, the whole will be equal. 5. If from equal things, equal things be deducted the remainders will be equal.
Side 36 - XIII. •All parallelograms on the same or equal bases and between the same parallels...
Side 182 - VI. To find the content of a triangular piece of ground, Multiply the base by half the perpendicular, or the perpendicular by half the base ; or take half the product of the base into the perpendicular. The reason hereof is plain, from cor.
Side 35 - Triangles upon equal bases, and between the same parallels, are equal to one another.