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

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Page 80

Two scales of equal parts , one on each leg ,

Two scales of equal parts , one on each leg ,

**marked**LIN . Or L. Each of these scales , from the great extensiveness of its use , is called the line of lines . 2. Two lines of chords ,**marked**cho . or c . 3. Two lines of secants**marked**... Page 87

A line of chords

A line of chords

**marked**cho . 2. A line of sines**marked**sin . of tangents**marked**TAN . of semitantangents**marked**st . and of secants**marked**sec . this last is often upon the same line as the sines , because its gradations do not begin ... Page 90

... tenth parts of an unit , and the second ,

... tenth parts of an unit , and the second ,

**marked**by the diagonal upon the parallels , hundreth parts of the unit . But , if we suppose the larger divisions to be tens , the first subdivisions will be units , and the second tenths . Page 91

... drawn froin the given point , through the point

... drawn froin the given point , through the point

**marked**up on the arch , will form the required angle . The degrees contained in an angle already laid down , are found nearly in the same manner ; for instance , to measure an angle . Page 93

... numbered both ways ; the blank side represents the diameter of a circle . The side of the protractor to be applied to the paper is made flat , and that whereon the degrees are

... numbered both ways ; the blank side represents the diameter of a circle . The side of the protractor to be applied to the paper is made flat , and that whereon the degrees are

**marked**, is chamfered or sloped away to the edge that an ...### 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.