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

### Dentro del libro

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Página 178

If you

to observe , that if your map is to be

, every division on the protractor's edge will be one two - pole chain ; } a ...

If you

**lay**off the stationary distances by the edge of the protractor , it is necessaryto observe , that if your map is to be

**laid**down by a scale of 40 perches to an inch, every division on the protractor's edge will be one two - pole chain ; } a ...

Página 208

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

from 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

...

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 247

Let the pricked or popped lines represent the copy of a down or old survey ,

down by a scale of 80 perches to an inch , and ... Pitch upon your centre as o ,

from whence thro ' a

...

Let the pricked or popped lines represent the copy of a down or old survey ,

**laid**down by a scale of 80 perches to an inch , and ... Pitch upon your centre as o ,

from whence thro ' a

**lay**the fiducial edge of a thin ruler , with a fine pointed pair of...

Página 250

By the methods here

20 perches to an inch , which contained upwards of 1200 acres , and consisted of

224 separate divisions , without the least confusion from the lines ; for none ...

By the methods here

**laid**down I have reduced a map from a scale of 40 to one of20 perches to an inch , which contained upwards of 1200 acres , and consisted of

224 separate divisions , without the least confusion from the lines ; for none ...

Página 264

This will be found to be very useful in setting an horizontal dial , for if you

edge of the index by the base of the stile of ... If all maps had a true meridian line

This will be found to be very useful in setting an horizontal dial , for if you

**lay**theedge of the index by the base of the stile of ... If all maps had a true meridian line

**laid**out upon them , it would be easy by producing it , and drawing parallels , to ...### 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.