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

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Page 38

Note , When an

Note , When an

**angle**is expressed by three letters , the middle one is that at the angular point . 9. When the lines that form the**angle**are right ones , it is then called a right - lined**angle**, as ÅBC , fig . 4. Page 41

... is the sine of the arc HB , or of its supplement ADH . fig . 8 . 28. The measure of a right - lined

... is the sine of the arc HB , or of its supplement ADH . fig . 8 . 28. The measure of a right - lined

**angle**, is the arc of a circle swept from the angular point , and G 1 contained between the two lines that form the**angle**GEOMETRY . 41. Page 42

1 contained between the two lines that form the

1 contained between the two lines that form the

**angle**: thus the**angle**HCB ( fig . 8. ) is measured by the arc HB , and is said to contain so many degrees as the arc HB does ; so if the arc HB is 60 degrees , the**angle**HCB is an**angle**... Page 43

In respect to its

In respect to its

**angles**, it is either rightangled , having one right**angle**, as D. fig . 19 . 37. Or obtuse angled , having one obtuse**angle**, as E. fig . 14 . 38. Or acute angled , having all the**angles**acute , as F. fig . 15 . 39. Page 44

A parallelogram whose sides are all equal and

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.### 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.