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

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acres altitude Answer arch azimuth base bearing blank line centre chains and links circle circumferentor Co-sec Co-sine Co-tang column compasses contained decimal decimal fraction Dep Lat difference divided divisions divisor draw east Ecliptic edge Example feet field-book figures fore four-pole chains geometrical series given angle given number half the sum Horizon glass hypothenuse inches instrument Lat Dep latitude length logarithm measure meridian distance minutes multiplied needle Nonius number of degrees object observed off-sets opposite parallelogram perches perpendicular plane pole pole star PROB proportion protractor Quadrant quotient radius right angles right line SCHOLIUM screw Secant sect semicircle side sights square root station stationary distance subtract survey taken Tang tangent theo theodolite trapezium triangle ABC trigonometry vane versed sine vulgar fraction whence

### Popular passages

Page 48 - 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 35 - 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 211 - RULE. From half the sum of the three sides subtract each side severally.

Page 10 - Then multiply the second and third terms together, and divide the product by the first term: the quotient will be the fourth term, or answer.

Page 116 - 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 10 - ... then multiply the second and third terms together, and divide the product by the first term, and the quotient will be the answer ; — in the same denomination with the third term.

Page 37 - 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.