A Treatise of Practical Surveying, ...1808 - 440 páginas |
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Página
... sun's de- clination how to find by what scale a map is laid down , having the map and area given : how to find the content of ground that is surveyed by a chain that is too long or too short the method of dividing lands : And the whole ...
... sun's de- clination how to find by what scale a map is laid down , having the map and area given : how to find the content of ground that is surveyed by a chain that is too long or too short the method of dividing lands : And the whole ...
Página 108
... sun's altitude , requi- site to be known in many astronomical cases ; this is effected by letting the sun's ray , which passes thro ' the upper sight , fall upon the hole in the lower one ; and the degree then cut by the thread , will ...
... sun's altitude , requi- site to be known in many astronomical cases ; this is effected by letting the sun's ray , which passes thro ' the upper sight , fall upon the hole in the lower one ; and the degree then cut by the thread , will ...
Página 110
... sun shines , as well as the length of the shadow of the object , whose height is required ; and you have the proper ... sun ; whence the angle a = A ( by part 3. theo . 3. sect . 1. ) and consequently cC . The triangles being therefore ...
... sun shines , as well as the length of the shadow of the object , whose height is required ; and you have the proper ... sun ; whence the angle a = A ( by part 3. theo . 3. sect . 1. ) and consequently cC . The triangles being therefore ...
Página 149
... line with station No. 1 , and expresses the number of de- grees the stationary line is from the north , count- ing quite round with the sun . Most Most needles are pointed at the south end , and OF THE CIRCUMFERENTOR . 149.
... line with station No. 1 , and expresses the number of de- grees the stationary line is from the north , count- ing quite round with the sun . Most Most needles are pointed at the south end , and OF THE CIRCUMFERENTOR . 149.
Página 244
... Sun. T was before observed , that the needle does not point truly to the north or south points of the horizon : the number of degrees , therefore , that the points of the needle are from the north or south points of the horizon , is ...
... Sun. T was before observed , that the needle does not point truly to the north or south points of the horizon : the number of degrees , therefore , that the points of the needle are from the north or south points of the horizon , is ...
Otras ediciones - Ver todas
A Treatise of Practical Surveying: Which Is Demonstrated From Its First ... Robert Gibson Sin vista previa disponible - 2018 |
Términos y frases comunes
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
Pasajes populares
Página 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.
Página 199 - ... that triangles on the same base and between the same parallels are equal...
Página 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.
Página 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.
Página 95 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.
Página 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.
Página 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.
Página 36 - XIII. •All parallelograms on the same or equal bases and between the same parallels...
Página 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.
Página 35 - Triangles upon equal bases, and between the same parallels, are equal to one another.