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

### Dentro del libro

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Página 167

At the second , or next

index to the degree of the last

index to you , and cut the object at the foregoing

At the second , or next

**station**, unscrew the instrument , and set the south of theindex 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 171

... after having taken the first angle as before , and having removed your

instrument to the second

drawn line and look backward thro ' the sights ; if you then see the object in the

first

... after having taken the first angle as before , and having removed your

instrument to the second

**station**, and placed the ... to lay the index on the lastdrawn line and look backward thro ' the sights ; if you then see the object in the

first

**station**... Página 235

20L . then in a line with the second

. IC . 20L . that is , the off - set is a right hand one of 1C . 20L . Again at m , which

suppose to be 10C . 25L . from 2 ; take the off - set mh of iC . 15L . and in a line ...

20L . then in a line with the second

**station**in your field - book , say at 4C . 10L . R. IC . 20L . that is , the off - set is a right hand one of 1C . 20L . Again at m , which

suppose to be 10C . 25L . from 2 ; take the off - set mh of iC . 15L . and in a line ...

Página 243

In your protraction as you proceed , let every intersection be laid off from the

respective

intersection was taken at , and the

diverges , or ...

In your protraction as you proceed , let every intersection be laid off from the

respective

**stations**from whence they ... between the**station**the foregoingintersection was taken at , and the

**station**from whence the intersection linediverges , or ...

Página 248

When you have done with a

as at the

...

When you have done with a

**station**, give a dash with a pen or pencil to it , suchas at the

**station**a and b ; by this means you cannot be disappointed in missing a**station**, or in laying your ruler over one**station**twice . From what has been said it...

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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.