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

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Page 38

fall upon another right line , AB , so as to incline to neither

fall upon another right line , AB , so as to incline to neither

**side**, but make the angles ADC , CDB on each**side**equal to each other , then those angles are called right angles , and the line CD a perpendicular . 11. Page 43

Or isosceles , having two equal

Or isosceles , having two equal

**sides**, as B. O CON fig . 11 . 35. ... Acute and obtuse angled triangles are in general called oblique angled triangles in all which any**side**may be called the base , and the other two the**sides**. Page 44

A parallelogram whose

A parallelogram whose

**sides**are all equal and angles right , is called a square , as ABCD . fig . 17 . 44. A parallelogram whose opposite**sides**are equal and angles right , is called a rectangle , or an oblong , as ABCD . fig . 3 . 45. Page 47

Whence if any numbers of right lines were drawn from one point , on the same

Whence if any numbers of right lines were drawn from one point , on the same

**side**of a right line ; all the angles made by these lines will be equal to two right lines . m 2. And all the angles which can be made about a point , will be ... Page 48

The external angle will be equal to the internal and opposite one on the same

The external angle will be equal to the internal and opposite one on the same

**side**, that is , GEB = EFD and AEG = CFE . 4. And the sum of the internal angles on the same**side**, are equal to tivo right angles ; that is , BEF + DFE are ...### 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.