A Treatise of Practical Surveying: Which is Demonstrated from Its First Principles ... |
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Σελίδα 160
By this method your stations are laid out to the best advantage , and two men
may do the business of three , for one of those who chain , may be your object ;
but in fore - sights you must have an object before you , besides two chainmen .
By this method your stations are laid out to the best advantage , and two men
may do the business of three , for one of those who chain , may be your object ;
but in fore - sights you must have an object before you , besides two chainmen .
Σελίδα 161
But in this last method , care must be taken to see that the sights have not the
least cast on either side ; if they have , it will destroy all : and yet with the same
sights you may take a survey by foresights , or by back - sights , only , with as
great ...
But in this last method , care must be taken to see that the sights have not the
least cast on either side ; if they have , it will destroy all : and yet with the same
sights you may take a survey by foresights , or by back - sights , only , with as
great ...
Σελίδα 167
... of sights fixed at 360 and 180 , besides those on the moveable index ; if you
would use both , look through the standing sights , with the 180 next you , to an
object at the foregoing station : screw the instrument fast , and direct the upper
sights ...
... of sights fixed at 360 and 180 , besides those on the moveable index ; if you
would use both , look through the standing sights , with the 180 next you , to an
object at the foregoing station : screw the instrument fast , and direct the upper
sights ...
Σελίδα 289
Sights may be placed at r and s and the instrument adjusted to them , as before ,
by reversing them in the direction of some distant object . After the instrument is
duly adjusted , you may proceed to use it . Let the example be this annexed ( fig .
Sights may be placed at r and s and the instrument adjusted to them , as before ,
by reversing them in the direction of some distant object . After the instrument is
duly adjusted , you may proceed to use it . Let the example be this annexed ( fig .
Σελίδα 290
back to the staff bB , and enter the numbers cut by the vane there under the title
Back sights ; then look forwards to cB ... c . always taking care to keep the staff in
the same place when you look'd at it for a Fore sight , till you have also taken with
...
back to the staff bB , and enter the numbers cut by the vane there under the title
Back sights ; then look forwards to cB ... c . always taking care to keep the staff in
the same place when you look'd at it for a Fore sight , till you have also taken with
...
Τι λένε οι χρήστες - Σύνταξη κριτικής
Δεν εντοπίσαμε κριτικές στις συνήθεις τοποθεσίες.
Συχνά εμφανιζόμενοι όροι και φράσεις
acres angle Answer base bearing called centre chains chord circle Co-sec Co-sine Co-tang column contained decimal difference direct distance divided division draw drawn east edge equal EXAMPLE feet field field-book figures four four-pole fourth give given greater ground half height Hence inches laid land Lat Dep length less logarithm manner measure method multiplied needle object observe opposite parallel perches perpendicular plain plane Plate pole prob PROBLEM proportion quantity quotient radius reduce remainder right angles right line root scale Secant sect side sights sine square station suppose survey taken Tang tangent theo THEOREM third triangle triangle ABC true turn variation whence whole
Δημοφιλή αποσπάσματα
Σελίδα 25 - 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 207 - ... that triangles on the same base and between the same parallels are equal...
Σελίδα 40 - 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 43 - Triangles upon equal bases, and between the same parallels, are equal to one another.
Σελίδα 103 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.
Σελίδα 31 - Figures which consist of more than four sides are called polygons ; if the sides are all equal to each other, they are called regular polygons. They sometimes are named from the number of. their sides, as a five-sided figure is called a pentagon, one of six sides a hexagon, &"c.
Σελίδα 31 - ... they are called regular polygons. They sometimes are named from the number of their sides, as a five-sided figure is called a pentagon, one of. six sides a hexagon, &c. but if their sides are not equal to each other, then they are called irregular polygons, as an irregular pentagon, hexagon, &c.
Σελίδα 45 - 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 265 - As the length of the whole line, Is to 57.3 Degrees,* So is the said distance, To the difference of Variation required. EXAMPLE. Suppose it be required to run a line which some years ago bore N. 45°.
Σελίδα 32 - Things that are equal to one and the same thing are equal to one another." " If equals be added to equals, the wholes are equal." " If equals be taken from equals, the remainders are equal.
Πληροφορίες βιβλιογραφίας
| Τίτλος | A Treatise of Practical Surveying: Which is Demonstrated from Its First Principles ... |
| Συγγραφέας | Robert Gibson |
| Έκδοση | 3 |
| Εκδότης | Lewis Nichols, 1806 |
| Πρωτότυπο από | το Πανεπιστήμιο του Μίτσιγκαν |
| Ψηφιοποιήθηκε στις | 26 Μάιος 2007 |
| Μέγεθος | 452 σελίδες |
| Εξαγωγή αναφοράς | BiBTeX EndNote RefMan |