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

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Page 39

The diameter of a circle is a right line drawn thro ' the centre , and terminating in

The diameter of a circle is a right line drawn thro ' the centre , and terminating in

**opposite**points of the circumference ; and it divides the circle and circumference into two equal parts , called semicircles ; and is double the ... Page 43

41. Any figure of four sides is called a quadrilateral figure . 42 , Quadrilateral figures , whose

41. Any figure of four sides is called a quadrilateral figure . 42 , Quadrilateral figures , whose

**opposite**sides are parallel , are called parallelograms : thus ABCD is a parallelogram . Fig . 3. 17 , GEOMETRY . 43. Page 44

A parallelogram whose

A parallelogram whose

**opposite**sides are equal and angles right , is called a rectangle , or an oblong , as ABCD . fig . 3 . 45. A rhombus is a parallelogram of equal sides , and has its angles oblique , as A fig . Page 47

... can be made about a point , will be equal to four right angles . THEO . II . P PL . 1. fig . 21 . If one right line cross another , ( as AC does BD ) the

... can be made about a point , will be equal to four right angles . THEO . II . P PL . 1. fig . 21 . If one right line cross another , ( as AC does BD ) the

**opposite**angles made by those lines , will be equal 10 each other : that is ... Page 48

The external angle will be equal to the internal and

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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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.