## A Treatise of Practical Surveying: Which is Demonstrated from Its First Principles ... |

### Dentro del libro

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Página 157

... for an object to take your view to : then having placed your instrument

horizontally ( which is easily done by

needle may be equidistant from its bottom , and it traverses or plays freely )

the flower - de ...

... for an object to take your view to : then having placed your instrument

horizontally ( which is easily done by

**turning**the box so that the ends of theneedle may be equidistant from its bottom , and it traverses or plays freely )

**turn**the flower - de ...

Página 161

If your needle be pointed at each end , in taking fore - sights , you may

north part of the box to your eye , and count your degrees to the south part of the

needle , as before ; or you may

If your needle be pointed at each end , in taking fore - sights , you may

**turn**thenorth 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 ... Página 167

At the second , or next station , unscrew the instrument , and set the south of the

index to the degree of the last station ;

index to you , and cut the object at the foregoing station ; screw the instrument ...

At the second , or next station , unscrew the instrument , and set the south of the

index to the degree of the last station ;

**turn**the whole about , with the south of theindex to you , and cut the object at the foregoing station ; screw the instrument ...

Página 170

Having placed the instrument at the first station

the needle be over the meridian , or flower - de - luce of the box , and there screw

it fast . Assign any convenient point , to which apply the edge of the index , so ...

Having placed the instrument at the first station

**turn**it about till the north end ofthe needle be over the meridian , or flower - de - luce of the box , and there screw

it fast . Assign any convenient point , to which apply the edge of the index , so ...

Página 177

Pitch upon any convenient point on your paper for your first station , as at 1 , on

which lay the centre - hole of your protractor , with a protractingpin ; then if the

degrees be less that 180 ,

the ...

Pitch upon any convenient point on your paper for your first station , as at 1 , on

which lay the centre - hole of your protractor , with a protractingpin ; then if the

degrees be less that 180 ,

**turn**the arc of your protractor downwards , or towardsthe ...

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### Términos y frases comunes

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

### Pasajes populares

Página 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.

Página 207 - ... that triangles on the same base and between the same parallels are equal...

Página 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.

Página 43 - Triangles upon equal bases, and between the same parallels, are equal to one another.

Página 103 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.

Página 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.

Página 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.

Página 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.

Página 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°.

Página 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.