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

### Dentro del libro

Resultados 1-5 de 5

Página 170

There is a brass ruler or index of about two inches broad , with a sharp or fiducial

and without diagonals , and a scale of chords ; the whole is fixed on a ball and ...

There is a brass ruler or index of about two inches broad , with a sharp or fiducial

**edge**, at each end of which is a sight ; on the ruler are scales of equal parts withand without diagonals , and a scale of chords ; the whole is fixed on a ball and ...

Página 175

The outward circle is numbered from the right to the left hand , with 10 , 20 , 30 ,

8c . to 180 degrees ; the middlemost the same way , from 180 to 360 degrees ;

and the innermost from the upper

The outward circle is numbered from the right to the left hand , with 10 , 20 , 30 ,

8c . to 180 degrees ; the middlemost the same way , from 180 to 360 degrees ;

and the innermost from the upper

**edge**of the scale both ways , from 10 , 20 , 30 ... Página 178

Place your protractor parallel as before , and by the

the pin prick at that degree , thro ' which and the end of the foregoing station ,

draw a blank line , and on it set the distance of that station . In the like manner ...

Place your protractor parallel as before , and by the

**edge**of the semicircle , withthe pin prick at that degree , thro ' which and the end of the foregoing station ,

draw a blank line , and on it set the distance of that station . In the like manner ...

Página 208

Produce any line of the map , as AH , both ways , lay the

from A to C , having B above it ; hold the other side of the ruler , or that next you

fast ; open till the same

...

Produce any line of the map , as AH , both ways , lay the

**edge**of parallel - rulerfrom A to C , having B above it ; hold the other side of the ruler , or that next you

fast ; open till the same

**edge**touches B , and by it , with a protracting pin mark the...

Página 209

open till the same

line . A line drawn from D to e , will take in as much as it leaves out . Thus have

you the triangle c D e , equal to the irregular polygon A B C D E F G H. If when the

...

open till the same

**edge**touches E , and by it mark the point e , on the producedline . A line drawn from D to e , will take in as much as it leaves out . Thus have

you the triangle c D e , equal to the irregular polygon A B C D E F G H. If when the

...

### Comentarios de la gente - Escribir un comentario

No encontramos ningún comentario en los lugares habituales.

### 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.