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

### Dentro del libro

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Página 161

The manner of using this part of the instrument is this : having directed your sights

to the object , whether fore or back , as before ; observe the two cardinal points of

your compass , the point of the needle lies between ( the north , south ,

The manner of using this part of the instrument is this : having directed your sights

to the object , whether fore or back , as before ; observe the two cardinal points of

your compass , the point of the needle lies between ( the north , south ,

**east**... Página 162

needle lies between ( the north , south ,

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 fourcardinal 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 ...

Página 177

Or if the right hand be made the north , and the left the south , the west will be

then up , and the

the arc of your protractor upwards , or towards the west ; and if more , downwards

, or ...

Or if the right hand be made the north , and the left the south , the west will be

then up , and the

**east**down . In this case , if the degrees be less than 180 , turnthe arc of your protractor upwards , or towards the west ; and if more , downwards

, or ...

Página 222

From the two preceding theorems we learn how to find the area of the map ,

when the first meridian passes through it ; that is , when one part of the map lies

on the

merid ...

From the two preceding theorems we learn how to find the area of the map ,

when the first meridian passes through it ; that is , when one part of the map lies

on the

**east**and the other on the west side of that meridian . Thus , RULE . Themerid ...

Página 263

For if the variation be westerly , the magnetical meridian will be the quantity of

variation of the west side of the true meridian , but if easterly on the

therefore the true meridian must be a like quantity on the

magnetical ...

For if the variation be westerly , the magnetical meridian will be the quantity of

variation of the west side of the true meridian , but if easterly on the

**east**side ,therefore the true meridian must be a like quantity on the

**east**side of themagnetical ...

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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.