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

### From inside the book

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**Meridian**Altitude of the Sun 4. Variation of the Compass LIST OF TABLES . 1 Logarithms of Numbers Sines , Tangents and Secants 20 Natural Sines Points of the Compass Traverse Table 316 918 Mean Refraction Sun's Parallax Dip of the ... Page

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**Meridian**Al- titude of the Sun 315 4. Variation of the Com- 305 159 pass 918 The Semicircle 164 Mensuration of An- LIST OF TABLES . gles by these In- struments 169 The Protractor , 171 2. Mensuration of Logarithms of Numbers Sines ... Page 159

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**meridian**line , or the proper situation of the land . Over the brass circle is a pair of sights , fixed to a moveable index , which turns on the centre of the instrument , and upon which the circumferentor box is placed . This ... Page 163

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**meridian**; and inasmuch as one pair is sufficient to find the angles of the field , the se- cond can be of no use : besides , they obstruct the free motion of the moveable index , and therefore are rather an incumbrance than of any real ... Page 166

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**meridian**, or flower - de - luce of the box , and there screw it fast . Assign any convenient point , to which apply the edge of the index , so as through the sights you may see the object in the last sta- tion , and by the edge of the ...### Other editions - View all

### Common terms and phrases

acres altitude Answer arch base bearing blank line centre chains and links circle circumferentor Co-sec Co-tang column compasses contained decimal decimal fraction diameter difference Dist divided divisions draw east Ecliptic edge EXAMPLE feet field-book figures four-pole chains geometrical series given number half the sum Horizon glass hypothenuse inches instrument Lat Dep Lat latitude length line of numbers logarithm measure meridian distance minutes multiplied natural co-sine natural sine Nonius number of degrees object observed off-sets opposite parallelogram pegs perches perpendicular plane pole pole star PROB proportion protractor quadrant quotient radius right angles right line scale of equal SCHOLIUM 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 40 - 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 27 - 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 195 - RULE. From half the sum of the three sides subtract each side severally.

Page 2 - 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 108 - 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 2 - ... 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 29 - 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.