## The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this Art |

### From inside the book

Page 12

72 80 72 8 Reduce 5 furlongs 12

72 80 72 8 Reduce 5 furlongs 12

**perches**to the decimal of a mile . 1 mile 5 furlongs 8 40 200 8 fur . 40 vulgar fraction . 320 320 per . 320 ) 200.00.625 1920 decimal sought : 800 640 1600 1600 Reduce 21 minutes 54 seconds to the ... Page 103

... and this mark ' on a side , denotes its length to be given in feet , yards ,

... and this mark ' on a side , denotes its length to be given in feet , yards ,

**perches**, or miles , & c . and this mark " , either in an angle or on a side , denotes the angle or side to be required . From these proportions it may be ... Page 134

The English statute -

The English statute -

**perch**is 51 yards , the twopole chain is 11 yards , and the four pole one is 22 yards ; hence the ... There are other**perches**used in different parts of England , as the**perch**of woodland measure , which is 6 yards ... Page 139

Or roads may be measured by a chain more accurately ; for 80 four - pole , 160 two - pole chains , or 320

Or roads may be measured by a chain more accurately ; for 80 four - pole , 160 two - pole chains , or 320

**perches**, make a mile as beiore : and if roads are measured by a statute chain , it will give OF THE CHAIN , 139. Page 140

Hence an English mile con tains 1760 , and an Irish mile 2940 yards ; and because 14 half yards is an Irish , and 11 half yards is at English

Hence an English mile con tains 1760 , and an Irish mile 2940 yards ; and because 14 half yards is an Irish , and 11 half yards is at English

**perch**, therefore 11 Trish**perches**, or Irish miles , are equal to 14 English ones .### What people are saying - Write a review

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### Common terms and phrases

acres altitude angle Answer arch base bearing called centre chains chord circle Co-sec Co-sine Co-tang column compasses contained decimal degrees Dep Lat difference direct Dist distance divided divisions draw drawn east edge equal EXAMPLE extended feet figures fixed four fourth give given glass greater ground half hand height Hence Horizon inches laid land Lat Dep latitude length less logarithm manner marked measure meridian method minutes multiplied natural object observed opposite parallel perches perpendicular plane pole PROB proportion Quadrant quotient radius reduce remainder right angles right line root rule scale Secant sect side sights sine square station Sun's suppose survey taken Tang tangent theo third triangle true whole

### Popular passages

Page 38 - 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.

Page 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.

Page 199 - RULE. From half the sum of the three sides subtract each side severally.

Page 106 - C' (89) (90) (91) (92) (93) 112. In any plane triangle, the sum of any two sides is to their difference as the tangent of half the sum of the opposite angles is to the tangent of half their difference.

Page 27 - The VERSED SINE of an arc is that part of the diameter which is between the sine and the arc. Thus BA is the versed sine of the arc AG.