A Treatise of Practical Surveying, ...1808 - 440 σελίδες |
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Σελίδα 148
... needle touched with a load stone , which always retains the same situation ; that is , it always points to the North and South points of the horizon nearly , when the instrument is horizontal , and the needle at rest , The box is ...
... needle touched with a load stone , which always retains the same situation ; that is , it always points to the North and South points of the horizon nearly , when the instrument is horizontal , and the needle at rest , The box is ...
Σελίδα 149
... 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 the index about , till you cut the person ...
... 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 the index about , till you cut the person ...
Σελίδα 150
... needles are better than those which are pointed at each end , be- cause the surveyor cannot mistake by counting to a wrong end ; which error may be frequently commit- ted , in using a two - pointed needle . Two - pointed needles have ...
... needles are better than those which are pointed at each end , be- cause the surveyor cannot mistake by counting to a wrong end ; which error may be frequently commit- ted , in using a two - pointed needle . Two - pointed needles have ...
Σελίδα 151
... needle , which will be the same as if they were taken from the ob- ject to the instrument , the direction of the index being the same . Let the degree be inserted in the field - book , and the stationary distance be mea- sured and ...
... needle , which will be the same as if they were taken from the ob- ject to the instrument , the direction of the index being the same . Let the degree be inserted in the field - book , and the stationary distance be mea- sured and ...
Σελίδα 152
... needle . Again , from B observe an object at C , with the north of the box to your eye , and set down the degree cut by the south point of the needle , so have you the bearings of the lines AB and BC ; you may then set up your ...
... needle . Again , from B observe an object at C , with the north of the box to your eye , and set down the degree cut by the south point of the needle , so have you the bearings of the lines AB and BC ; you may then set up your ...
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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-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
Δημοφιλή αποσπάσματα
Σελίδα 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.
Σελίδα 199 - ... that triangles on the same base and between the same parallels are equal...
Σελίδα 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.
Σελίδα 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.
Σελίδα 95 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.
Σελίδα 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.
Σελίδα 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.
Σελίδα 36 - XIII. •All parallelograms on the same or equal bases and between the same parallels...
Σελίδα 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.
Σελίδα 35 - Triangles upon equal bases, and between the same parallels, are equal to one another.