A Treatise of Practical Surveying: Which is Demonstrated from Its First Principles ... |
Αναζήτηση στο βιβλίο
Αποτελέσματα 1 - 5 από τα 5.
Σελίδα 161
If your needle be pointed at each end , in taking fore - sights , you may 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 ...
If your needle be pointed at each end , in taking fore - sights , you may 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 ...
Σελίδα 162
needle lies between ( the north , south , east , and west being called the four
cardinal points , and are graved on the bottom of the box ) putting down those
points together by their initial letters , and thereto annexing the number of
degrees ...
needle lies between ( the north , south , east , and west being called the four
cardinal points , and are graved on the bottom of the box ) putting down those
points together by their initial letters , and thereto annexing the number of
degrees ...
Σελίδα 171
This method may be used in good weather , if the needle be well touched and
play freely ; but if it be in windy weather , or the needle out of order , it is better ,
after having taken the first angle as before , and having removed your instrument
to ...
This method may be used in good weather , if the needle be well touched and
play freely ; but if it be in windy weather , or the needle out of order , it is better ,
after having taken the first angle as before , and having removed your instrument
to ...
Σελίδα 252
IT was before observed , that the needle does IT 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 called the
variation of ...
IT was before observed , that the needle does IT 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 called the
variation of ...
Σελίδα 263
If the variation be westerly , turn the box about till the north of the needle points as
many degrees from the flower - de - luce towards the east of the box , or till the
south of the needle points the like number of degrees from the south towards the
...
If the variation be westerly , turn the box about till the north of the needle points as
many degrees from the flower - de - luce towards the east of the box , or till the
south of the needle points the like number of degrees from the south towards the
...
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.