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

### Dentro del libro

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Página 161

If your

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

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 162

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 171

This method may be used in good weather , if the

play freely ; but if it be in windy weather , or the

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 andplay 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 ...

Página 252

IT was before observed , that the

south points of the horizon : the number of degrees therefore , that the points of

the

variation of ...

IT was before observed , that the

**needle**does IT not point truly to the north orsouth 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 thevariation of ...

Página 263

If the variation be westerly , turn the box about till the north of the

many degrees from the flower - de - luce towards the east of the box , or till the

south of the

...

If the variation be westerly , turn the box about till the north of the

**needle**points asmany 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...

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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.