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

### Dentro del libro

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one N. 70 ° 30. E. Required the variation . True azimuth Magnetical azimuth N.

83o . 20 E S. 70. 30 E. Variation 12. 50 E. The true azimuth being to the right of

the ...

**EXAMPLE**II . Suppose the sun's true azimuth N. 830. 20. E. but the magneticalone N. 70 ° 30. E. Required the variation . True azimuth Magnetical azimuth N.

83o . 20 E S. 70. 30 E. Variation 12. 50 E. The true azimuth being to the right of

the ...

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end of this tract ; by a line running from E due West 40 perches to a well at O ,

and from thence a right line to a point M in the boundary HI ; the place of M , and

the ...

**EXAMPLE**III . Plate XII , fig . 3 . It is proposed to cut off 38A . 16 ; P . to the southend of this tract ; by a line running from E due West 40 perches to a well at O ,

and from thence a right line to a point M in the boundary HI ; the place of M , and

the ...

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276

land , which is proposed , as an

two right - lines running from the sixth and seventh stations ; and proved , by ...

276

**EXAMPLE**V. The following Field - Notes ( from A. Burns ) are of a piece ofland , which is proposed , as an

**example**to be divided into three equal parts bytwo right - lines running from the sixth and seventh stations ; and proved , by ...

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geometrically , in the proportion of 2 to 3 , by a right line from a given point in any

boundary or angle thereof , suppose the point D. Reduce the plot to the triangle ...

**EXAMPLE**VI . Plate VIII . fig . 5 The plot ABCDEFGHA is proposed to be divided ,geometrically , in the proportion of 2 to 3 , by a right line from a given point in any

boundary or angle thereof , suppose the point D. Reduce the plot to the triangle ...

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of which the field - notes are given in

See

**EXAMPLE**X. It is required to divide off 30 acres , to the southeast end of the tract ,of which the field - notes are given in

**example**4th , by a right - line to run N. 20 E.See

**example**4th . SECTION VIII . Containing the surveying of Harbours , 8c ...### Comentarios de la gente - Escribir un comentario

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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.