A Treatise of Practical Surveying, ...1808 - 440 pages |
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Page 145
... true , let the measure of the angle CHD be taken by the line oo , with the chain : if this angle corresponds with its containing sides , the length of the line DC is truly obtained , and the whole work is truly taken . Note . That in ...
... true , let the measure of the angle CHD be taken by the line oo , with the chain : if this angle corresponds with its containing sides , the length of the line DC is truly obtained , and the whole work is truly taken . Note . That in ...
Page 163
... true ; if not , turn the table about , the index lying on the last line , till through the sights you see the object in the first station ; and then screw it fast , and keeping the edge of the index to the second station , direct your ...
... true ; if not , turn the table about , the index lying on the last line , till through the sights you see the object in the first station ; and then screw it fast , and keeping the edge of the index to the second station , direct your ...
Page 201
... true place of the extended line . Lay then the fiducial edge of the scale from b to D , and take a distance from C , that will just touch the edge of the scale ; carry that dis- Dd tance tance along the edge , till the point which was ...
... true place of the extended line . Lay then the fiducial edge of the scale from b to D , and take a distance from C , that will just touch the edge of the scale ; carry that dis- Dd tance tance along the edge , till the point which was ...
Page 202
... true place of the extended line . Draw a line from c to D , and it will take in and leave out equally ; in like manner the other side of the figure may be balanced by the line e D. Let the point of your compasses be kept to the last ...
... true place of the extended line . Draw a line from c to D , and it will take in and leave out equally ; in like manner the other side of the figure may be balanced by the line e D. Let the point of your compasses be kept to the last ...
Page 204
... true content of a survey , though it be taken by a chain that is too long or too short . Let the map be constructed , and its area found as if the chain were of the true length . And it will be As the square of the true chain Is the ...
... true content of a survey , though it be taken by a chain that is too long or too short . Let the map be constructed , and its area found as if the chain were of the true length . And it will be As the square of the true chain Is the ...
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A Treatise of Practical Surveying: Which Is Demonstrated From Its First ... Robert Gibson No preview available - 2018 |
Common terms and phrases
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
Popular passages
Page 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.
Page 199 - ... that triangles on the same base and between the same parallels are equal...
Page 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.
Page 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.
Page 95 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.
Page 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.
Page 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.
Page 36 - XIII. •All parallelograms on the same or equal bases and between the same parallels...
Page 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.
Page 35 - Triangles upon equal bases, and between the same parallels, are equal to one another.